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<!doctype html><html lang="en-GB-oxendict">
<head><meta name="viewport" content="width=device-width, initial-scale=1"><meta charset="utf-8"><meta property="og:image" content="https://tc39.es/ecmarkup/ecma-logo.png"><meta property="og:title" content="ECMAScript® 2026 Language&nbsp;Specification"><meta property="og:description" content="Introduction
This Ecma Standard defines the ECMAScript 2026 Language. It is the seventeenth edition of the ECMAScript Language Specification. ECMAScript is based on several originating technologies, the most well-known being JavaScript (Netscape) and JScript (Microsoft). The language was invent">
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<link rel="stylesheet" href="../assets/css/ecmarkup.css"><link rel="stylesheet" href="../assets/css/print.css" media="print">
<title>ECMAScript® 2026 Language&nbsp;Specification</title><script src="../assets/js/multipage.js?cache=Wu2V1pj2" defer=""></script><script src="../assets/js/ecmarkup.js?cache=BPFBckdu" defer=""></script><link rel="canonical" href="../#sec-structured-data"></head>
<body><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="./#sec-intro" title="Introduction">Introduction</a></li><li><span class="item-toggle-none"></span><a href="scope.html#sec-scope" title="Scope"><span class="secnum">1</span> Scope</a></li><li><span class="item-toggle">+</span><a href="conformance.html#sec-conformance" title="Conformance"><span class="secnum">2</span> Conformance</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="conformance.html#sec-conformance-normative-optional" title="Example Normative Optional Clause Heading"><span class="secnum">2.1</span> Example Normative Optional Clause Heading</a></li><li><span class="item-toggle-none"></span><a href="conformance.html#sec-conformance-legacy" title="Example Legacy Clause Heading"><span class="secnum">2.2</span> Example Legacy Clause Heading</a></li><li><span class="item-toggle-none"></span><a href="conformance.html#sec-conformance-legacy-normative-optional" title="Example Legacy Normative Optional Clause Heading"><span class="secnum">2.3</span> Example Legacy Normative Optional Clause Heading</a></li></ol></li><li><span class="item-toggle-none"></span><a href="normative-references.html#sec-normative-references" title="Normative References"><span class="secnum">3</span> Normative References</a></li><li><span class="item-toggle">+</span><a href="overview.html#sec-overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="overview.html#sec-web-scripting" title="Web Scripting"><span class="secnum">4.1</span> Web Scripting</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-hosts-and-implementations" title="Hosts and Implementations"><span class="secnum">4.2</span> Hosts and Implementations</a></li><li><span class="item-toggle">+</span><a href="overview.html#sec-ecmascript-overview" title="ECMAScript Overview"><span class="secnum">4.3</span> ECMAScript Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="overview.html#sec-objects" title="Objects"><span class="secnum">4.3.1</span> Objects</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-strict-variant-of-ecmascript" title="The Strict Variant of ECMAScript"><span class="secnum">4.3.2</span> The Strict Variant of ECMAScript</a></li></ol></li><li><span class="item-toggle">+</span><a href="overview.html#sec-terms-and-definitions" title="Terms and Definitions"><span class="secnum">4.4</span> Terms and Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-implementation-approximated" title="implementation-approximated"><span class="secnum">4.4.1</span> implementation-approximated</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-implementation-defined" title="implementation-defined"><span class="secnum">4.4.2</span> implementation-defined</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-host-defined" title="host-defined"><span class="secnum">4.4.3</span> host-defined</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-type" title="type"><span class="secnum">4.4.4</span> type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-primitive-value" title="primitive value"><span class="secnum">4.4.5</span> primitive value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-object" title="object"><span class="secnum">4.4.6</span> object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-constructor" title="constructor"><span class="secnum">4.4.7</span> constructor</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-prototype" title="prototype"><span class="secnum">4.4.8</span> prototype</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-ordinary-object" title="ordinary object"><span class="secnum">4.4.9</span> ordinary object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-exotic-object" title="exotic object"><span class="secnum">4.4.10</span> exotic object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-standard-object" title="standard object"><span class="secnum">4.4.11</span> standard object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-built-in-object" title="built-in object"><span class="secnum">4.4.12</span> built-in object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-undefined-value" title="undefined value"><span class="secnum">4.4.13</span> undefined value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-undefined-type" title="Undefined type"><span class="secnum">4.4.14</span> Undefined type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-null-value" title="null value"><span class="secnum">4.4.15</span> null value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-null-type" title="Null type"><span class="secnum">4.4.16</span> Null type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-boolean-value" title="Boolean value"><span class="secnum">4.4.17</span> Boolean value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-boolean-type" title="Boolean type"><span class="secnum">4.4.18</span> Boolean type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-boolean-object" title="Boolean object"><span class="secnum">4.4.19</span> Boolean object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-string-value" title="String value"><span class="secnum">4.4.20</span> String value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-string-type" title="String type"><span class="secnum">4.4.21</span> String type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-string-object" title="String object"><span class="secnum">4.4.22</span> String object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-number-value" title="Number value"><span class="secnum">4.4.23</span> Number value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-number-type" title="Number type"><span class="secnum">4.4.24</span> Number type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-number-object" title="Number object"><span class="secnum">4.4.25</span> Number object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-infinity" title="Infinity"><span class="secnum">4.4.26</span> Infinity</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-nan" title="NaN"><span class="secnum">4.4.27</span> NaN</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-bigint-value" title="BigInt value"><span class="secnum">4.4.28</span> BigInt value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-bigint-type" title="BigInt type"><span class="secnum">4.4.29</span> BigInt type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-bigint-object" title="BigInt object"><span class="secnum">4.4.30</span> BigInt object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-symbol-value" title="Symbol value"><span class="secnum">4.4.31</span> Symbol value</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-symbol-type" title="Symbol type"><span class="secnum">4.4.32</span> Symbol type</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-symbol-object" title="Symbol object"><span class="secnum">4.4.33</span> Symbol object</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-terms-and-definitions-function" title="function"><span class="secnum">4.4.34</span> function</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-built-in-function" title="built-in function"><span class="secnum">4.4.35</span> built-in function</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-built-in-constructor" title="built-in constructor"><span class="secnum">4.4.36</span> built-in constructor</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-property" title="property"><span class="secnum">4.4.37</span> property</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-method" title="method"><span class="secnum">4.4.38</span> method</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-built-in-method" title="built-in method"><span class="secnum">4.4.39</span> built-in method</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-attribute" title="attribute"><span class="secnum">4.4.40</span> attribute</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-own-property" title="own property"><span class="secnum">4.4.41</span> own property</a></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-inherited-property" title="inherited property"><span class="secnum">4.4.42</span> inherited property</a></li></ol></li><li><span class="item-toggle-none"></span><a href="overview.html#sec-organization-of-this-specification" title="Organization of This Specification"><span class="secnum">4.5</span> Organization of This Specification</a></li></ol></li><li><span class="item-toggle">+</span><a href="notational-conventions.html#sec-notational-conventions" title="Notational Conventions"><span class="secnum">5</span> Notational Conventions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="notational-conventions.html#sec-syntactic-and-lexical-grammars" title="Syntactic and Lexical Grammars"><span class="secnum">5.1</span> Syntactic and Lexical Grammars</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-context-free-grammars" title="Context-Free Grammars"><span class="secnum">5.1.1</span> Context-Free Grammars</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-lexical-and-regexp-grammars" title="The Lexical and RegExp Grammars"><span class="secnum">5.1.2</span> The Lexical and RegExp Grammars</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-numeric-string-grammar" title="The Numeric String Grammar"><span class="secnum">5.1.3</span> The Numeric String Grammar</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-syntactic-grammar" title="The Syntactic Grammar"><span class="secnum">5.1.4</span> The Syntactic Grammar</a></li><li><span class="item-toggle">+</span><a href="notational-conventions.html#sec-grammar-notation" title="Grammar Notation"><span class="secnum">5.1.5</span> Grammar Notation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-terminal-symbols" title="Terminal Symbols"><span class="secnum">5.1.5.1</span> Terminal Symbols</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-nonterminal-symbols-and-productions" title="Nonterminal Symbols and Productions"><span class="secnum">5.1.5.2</span> Nonterminal Symbols and Productions</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-optional-symbols" title="Optional Symbols"><span class="secnum">5.1.5.3</span> Optional Symbols</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-grammatical-parameters" title="Grammatical Parameters"><span class="secnum">5.1.5.4</span> Grammatical Parameters</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-one-of" title="one of"><span class="secnum">5.1.5.5</span> one of</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-empty" title="[empty]"><span class="secnum">5.1.5.6</span> [empty]</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-lookahead-restrictions" title="Lookahead Restrictions"><span class="secnum">5.1.5.7</span> Lookahead Restrictions</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-no-lineterminator-here" title="[no LineTerminator here]"><span class="secnum">5.1.5.8</span> [no <emu-nt>LineTerminator</emu-nt> here]</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-but-not" title="but not"><span class="secnum">5.1.5.9</span> but not</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-descriptive-phrases" title="Descriptive Phrases"><span class="secnum">5.1.5.10</span> Descriptive Phrases</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="notational-conventions.html#sec-algorithm-conventions" title="Algorithm Conventions"><span class="secnum">5.2</span> Algorithm Conventions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-evaluation-order" title="Evaluation Order"><span class="secnum">5.2.1</span> Evaluation Order</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-algorithm-conventions-abstract-operations" title="Abstract Operations"><span class="secnum">5.2.2</span> Abstract Operations</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-algorithm-conventions-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">5.2.3</span> Syntax-Directed Operations</a></li><li><span class="item-toggle">+</span><a href="notational-conventions.html#sec-runtime-semantics" title="Runtime Semantics"><span class="secnum">5.2.4</span> Runtime Semantics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-completion-ao" title="Completion ( completionRecord )"><span class="secnum">5.2.4.1</span> Completion ( <var>completionRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-throw-an-exception" title="Throw an Exception"><span class="secnum">5.2.4.2</span> Throw an Exception</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-shorthands-for-unwrapping-completion-records" title="Shorthands for Unwrapping Completion Records"><span class="secnum">5.2.4.3</span> Shorthands for Unwrapping Completion Records</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-implicit-normal-completion" title="Implicit Normal Completion"><span class="secnum">5.2.4.4</span> Implicit Normal Completion</a></li></ol></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-static-semantic-rules" title="Static Semantics"><span class="secnum">5.2.5</span> Static Semantics</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-mathematical-operations" title="Mathematical Operations"><span class="secnum">5.2.6</span> Mathematical Operations</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-value-notation" title="Value Notation"><span class="secnum">5.2.7</span> Value Notation</a></li><li><span class="item-toggle-none"></span><a href="notational-conventions.html#sec-identity" title="Identity"><span class="secnum">5.2.8</span> Identity</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-undefined-type" title="The Undefined Type"><span class="secnum">6.1.1</span> The Undefined Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-null-type" title="The Null Type"><span class="secnum">6.1.2</span> The Null Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-boolean-type" title="The Boolean Type"><span class="secnum">6.1.3</span> The Boolean Type</a></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type" title="The String Type"><span class="secnum">6.1.4</span> The String Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-stringindexof" title="StringIndexOf ( string, searchValue, fromIndex )"><span class="secnum">6.1.4.1</span> StringIndexOf ( <var>string</var>, <var>searchValue</var>, <var>fromIndex</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-stringlastindexof" title="StringLastIndexOf ( string, searchValue, fromIndex )"><span class="secnum">6.1.4.2</span> StringLastIndexOf ( <var>string</var>, <var>searchValue</var>, <var>fromIndex</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-numeric-types" title="Numeric Types"><span class="secnum">6.1.6</span> Numeric Types</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type" title="The Number Type"><span class="secnum">6.1.6.1</span> The Number Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-unaryMinus" title="Number::unaryMinus ( x )"><span class="secnum">6.1.6.1.1</span> Number::unaryMinus ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-bitwiseNOT" title="Number::bitwiseNOT ( x )"><span class="secnum">6.1.6.1.2</span> Number::bitwiseNOT ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-exponentiate" title="Number::exponentiate ( base, exponent )"><span class="secnum">6.1.6.1.3</span> Number::exponentiate ( <var>base</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-multiply" title="Number::multiply ( x, y )"><span class="secnum">6.1.6.1.4</span> Number::multiply ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-divide" title="Number::divide ( x, y )"><span class="secnum">6.1.6.1.5</span> Number::divide ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-remainder" title="Number::remainder ( n, d )"><span class="secnum">6.1.6.1.6</span> Number::remainder ( <var>n</var>, <var>d</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-add" title="Number::add ( x, y )"><span class="secnum">6.1.6.1.7</span> Number::add ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-subtract" title="Number::subtract ( x, y )"><span class="secnum">6.1.6.1.8</span> Number::subtract ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-leftShift" title="Number::leftShift ( x, y )"><span class="secnum">6.1.6.1.9</span> Number::leftShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-signedRightShift" title="Number::signedRightShift ( x, y )"><span class="secnum">6.1.6.1.10</span> Number::signedRightShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-unsignedRightShift" title="Number::unsignedRightShift ( x, y )"><span class="secnum">6.1.6.1.11</span> Number::unsignedRightShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-lessThan" title="Number::lessThan ( x, y )"><span class="secnum">6.1.6.1.12</span> Number::lessThan ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-equal" title="Number::equal ( x, y )"><span class="secnum">6.1.6.1.13</span> Number::equal ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-sameValue" title="Number::sameValue ( x, y )"><span class="secnum">6.1.6.1.14</span> Number::sameValue ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-sameValueZero" title="Number::sameValueZero ( x, y )"><span class="secnum">6.1.6.1.15</span> Number::sameValueZero ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numberbitwiseop" title="NumberBitwiseOp ( op, x, y )"><span class="secnum">6.1.6.1.16</span> NumberBitwiseOp ( <var>op</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-bitwiseAND" title="Number::bitwiseAND ( x, y )"><span class="secnum">6.1.6.1.17</span> Number::bitwiseAND ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-bitwiseXOR" title="Number::bitwiseXOR ( x, y )"><span class="secnum">6.1.6.1.18</span> Number::bitwiseXOR ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-bitwiseOR" title="Number::bitwiseOR ( x, y )"><span class="secnum">6.1.6.1.19</span> Number::bitwiseOR ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-tostring" title="Number::toString ( x, radix )"><span class="secnum">6.1.6.1.20</span> Number::toString ( <var>x</var>, <var>radix</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type" title="The BigInt Type"><span class="secnum">6.1.6.2</span> The BigInt Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-unaryMinus" title="BigInt::unaryMinus ( x )"><span class="secnum">6.1.6.2.1</span> BigInt::unaryMinus ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-bitwiseNOT" title="BigInt::bitwiseNOT ( x )"><span class="secnum">6.1.6.2.2</span> BigInt::bitwiseNOT ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-exponentiate" title="BigInt::exponentiate ( base, exponent )"><span class="secnum">6.1.6.2.3</span> BigInt::exponentiate ( <var>base</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-multiply" title="BigInt::multiply ( x, y )"><span class="secnum">6.1.6.2.4</span> BigInt::multiply ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-divide" title="BigInt::divide ( x, y )"><span class="secnum">6.1.6.2.5</span> BigInt::divide ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-remainder" title="BigInt::remainder ( n, d )"><span class="secnum">6.1.6.2.6</span> BigInt::remainder ( <var>n</var>, <var>d</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-add" title="BigInt::add ( x, y )"><span class="secnum">6.1.6.2.7</span> BigInt::add ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-subtract" title="BigInt::subtract ( x, y )"><span class="secnum">6.1.6.2.8</span> BigInt::subtract ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-leftShift" title="BigInt::leftShift ( x, y )"><span class="secnum">6.1.6.2.9</span> BigInt::leftShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-signedRightShift" title="BigInt::signedRightShift ( x, y )"><span class="secnum">6.1.6.2.10</span> BigInt::signedRightShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-unsignedRightShift" title="BigInt::unsignedRightShift ( x, y )"><span class="secnum">6.1.6.2.11</span> BigInt::unsignedRightShift ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-lessThan" title="BigInt::lessThan ( x, y )"><span class="secnum">6.1.6.2.12</span> BigInt::lessThan ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-equal" title="BigInt::equal ( x, y )"><span class="secnum">6.1.6.2.13</span> BigInt::equal ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-binaryand" title="BinaryAnd ( x, y )"><span class="secnum">6.1.6.2.14</span> BinaryAnd ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-binaryor" title="BinaryOr ( x, y )"><span class="secnum">6.1.6.2.15</span> BinaryOr ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-binaryxor" title="BinaryXor ( x, y )"><span class="secnum">6.1.6.2.16</span> BinaryXor ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-bigintbitwiseop" title="BigIntBitwiseOp ( op, x, y )"><span class="secnum">6.1.6.2.17</span> BigIntBitwiseOp ( <var>op</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-bitwiseAND" title="BigInt::bitwiseAND ( x, y )"><span class="secnum">6.1.6.2.18</span> BigInt::bitwiseAND ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-bitwiseXOR" title="BigInt::bitwiseXOR ( x, y )"><span class="secnum">6.1.6.2.19</span> BigInt::bitwiseXOR ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-bitwiseOR" title="BigInt::bitwiseOR ( x, y )"><span class="secnum">6.1.6.2.20</span> BigInt::bitwiseOR ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-tostring" title="BigInt::toString ( x, radix )"><span class="secnum">6.1.6.2.21</span> BigInt::toString ( <var>x</var>, <var>radix</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-object-type" title="The Object Type"><span class="secnum">6.1.7</span> The Object Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-property-attributes" title="Property Attributes"><span class="secnum">6.1.7.1</span> Property Attributes</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-object-internal-methods-and-internal-slots" title="Object Internal Methods and Internal Slots"><span class="secnum">6.1.7.2</span> Object Internal Methods and Internal Slots</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-invariants-of-the-essential-internal-methods" title="Invariants of the Essential Internal Methods"><span class="secnum">6.1.7.3</span> Invariants of the Essential Internal Methods</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-well-known-intrinsic-objects" title="Well-Known Intrinsic Objects"><span class="secnum">6.1.7.4</span> Well-Known Intrinsic Objects</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-ecmascript-specification-types" title="ECMAScript Specification Types"><span class="secnum">6.2</span> ECMAScript Specification Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-enum-specification-type" title="The Enum Specification Type"><span class="secnum">6.2.1</span> The Enum Specification Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type" title="The List and Record Specification Types"><span class="secnum">6.2.2</span> The List and Record Specification Types</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-set-and-relation-specification-type" title="The Set and Relation Specification Types"><span class="secnum">6.2.3</span> The Set and Relation Specification Types</a></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type" title="The Completion Record Specification Type"><span class="secnum">6.2.4</span> The Completion Record Specification Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-normalcompletion" title="NormalCompletion ( value )"><span class="secnum">6.2.4.1</span> NormalCompletion ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-throwcompletion" title="ThrowCompletion ( value )"><span class="secnum">6.2.4.2</span> ThrowCompletion ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-returncompletion" title="ReturnCompletion ( value )"><span class="secnum">6.2.4.3</span> ReturnCompletion ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-updateempty" title="UpdateEmpty ( completionRecord, value )"><span class="secnum">6.2.4.4</span> UpdateEmpty ( <var>completionRecord</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-reference-record-specification-type" title="The Reference Record Specification Type"><span class="secnum">6.2.5</span> The Reference Record Specification Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-ispropertyreference" title="IsPropertyReference ( V )"><span class="secnum">6.2.5.1</span> IsPropertyReference ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-isunresolvablereference" title="IsUnresolvableReference ( V )"><span class="secnum">6.2.5.2</span> IsUnresolvableReference ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-issuperreference" title="IsSuperReference ( V )"><span class="secnum">6.2.5.3</span> IsSuperReference ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-isprivatereference" title="IsPrivateReference ( V )"><span class="secnum">6.2.5.4</span> IsPrivateReference ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-getvalue" title="GetValue ( V )"><span class="secnum">6.2.5.5</span> GetValue ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-putvalue" title="PutValue ( V, W )"><span class="secnum">6.2.5.6</span> PutValue ( <var>V</var>, <var>W</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-getthisvalue" title="GetThisValue ( V )"><span class="secnum">6.2.5.7</span> GetThisValue ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-initializereferencedbinding" title="InitializeReferencedBinding ( V, W )"><span class="secnum">6.2.5.8</span> InitializeReferencedBinding ( <var>V</var>, <var>W</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-makeprivatereference" title="MakePrivateReference ( baseValue, privateIdentifier )"><span class="secnum">6.2.5.9</span> MakePrivateReference ( <var>baseValue</var>, <var>privateIdentifier</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-property-descriptor-specification-type" title="The Property Descriptor Specification Type"><span class="secnum">6.2.6</span> The Property Descriptor Specification Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-isaccessordescriptor" title="IsAccessorDescriptor ( Desc )"><span class="secnum">6.2.6.1</span> IsAccessorDescriptor ( <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-isdatadescriptor" title="IsDataDescriptor ( Desc )"><span class="secnum">6.2.6.2</span> IsDataDescriptor ( <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-isgenericdescriptor" title="IsGenericDescriptor ( Desc )"><span class="secnum">6.2.6.3</span> IsGenericDescriptor ( <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-frompropertydescriptor" title="FromPropertyDescriptor ( Desc )"><span class="secnum">6.2.6.4</span> FromPropertyDescriptor ( <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-topropertydescriptor" title="ToPropertyDescriptor ( Obj )"><span class="secnum">6.2.6.5</span> ToPropertyDescriptor ( <var>Obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-completepropertydescriptor" title="CompletePropertyDescriptor ( Desc )"><span class="secnum">6.2.6.6</span> CompletePropertyDescriptor ( <var>Desc</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-lexical-environment-and-environment-record-specification-types" title="The Environment Record Specification Type"><span class="secnum">6.2.7</span> The Environment Record Specification Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-abstract-closure" title="The Abstract Closure Specification Type"><span class="secnum">6.2.8</span> The Abstract Closure Specification Type</a></li><li><span class="item-toggle">+</span><a href="ecmascript-data-types-and-values.html#sec-data-blocks" title="Data Blocks"><span class="secnum">6.2.9</span> Data Blocks</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-createbytedatablock" title="CreateByteDataBlock ( size )"><span class="secnum">6.2.9.1</span> CreateByteDataBlock ( <var>size</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-createsharedbytedatablock" title="CreateSharedByteDataBlock ( size )"><span class="secnum">6.2.9.2</span> CreateSharedByteDataBlock ( <var>size</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes" title="CopyDataBlockBytes ( toBlock, toIndex, fromBlock, fromIndex, count )"><span class="secnum">6.2.9.3</span> CopyDataBlockBytes ( <var>toBlock</var>, <var>toIndex</var>, <var>fromBlock</var>, <var>fromIndex</var>, <var>count</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-privateelement-specification-type" title="The PrivateElement Specification Type"><span class="secnum">6.2.10</span> The PrivateElement Specification Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-classfielddefinition-record-specification-type" title="The ClassFieldDefinition Record Specification Type"><span class="secnum">6.2.11</span> The ClassFieldDefinition Record Specification Type</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-private-names" title="Private Names"><span class="secnum">6.2.12</span> Private Names</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-data-types-and-values.html#sec-classstaticblockdefinition-record-specification-type" title="The ClassStaticBlockDefinition Record Specification Type"><span class="secnum">6.2.13</span> The ClassStaticBlockDefinition Record Specification Type</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-abstract-operations" title="Abstract Operations"><span class="secnum">7</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-type-conversion" title="Type Conversion"><span class="secnum">7.1</span> Type Conversion</a><ol class="toc"><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-toprimitive" title="ToPrimitive ( input [ , preferredType ] )"><span class="secnum">7.1.1</span> ToPrimitive ( <var>input</var> [ , <var>preferredType</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-ordinarytoprimitive" title="OrdinaryToPrimitive ( O, hint )"><span class="secnum">7.1.1.1</span> OrdinaryToPrimitive ( <var>O</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toboolean" title="ToBoolean ( argument )"><span class="secnum">7.1.2</span> ToBoolean ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tonumeric" title="ToNumeric ( value )"><span class="secnum">7.1.3</span> ToNumeric ( <var>value</var> )</a></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-tonumber" title="ToNumber ( argument )"><span class="secnum">7.1.4</span> ToNumber ( <var>argument</var> )</a><ol class="toc"><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-tonumber-applied-to-the-string-type" title="ToNumber Applied to the String Type"><span class="secnum">7.1.4.1</span> ToNumber Applied to the String Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-stringtonumber" title="StringToNumber ( str )"><span class="secnum">7.1.4.1.1</span> StringToNumber ( <var>str</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-runtime-semantics-stringnumericvalue" title="Runtime Semantics: StringNumericValue"><span class="secnum">7.1.4.1.2</span> RS: StringNumericValue</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-roundmvresult" title="RoundMVResult ( n )"><span class="secnum">7.1.4.1.3</span> RoundMVResult ( <var>n</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tointegerorinfinity" title="ToIntegerOrInfinity ( argument )"><span class="secnum">7.1.5</span> ToIntegerOrInfinity ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toint32" title="ToInt32 ( argument )"><span class="secnum">7.1.6</span> ToInt32 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-touint32" title="ToUint32 ( argument )"><span class="secnum">7.1.7</span> ToUint32 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toint16" title="ToInt16 ( argument )"><span class="secnum">7.1.8</span> ToInt16 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-touint16" title="ToUint16 ( argument )"><span class="secnum">7.1.9</span> ToUint16 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toint8" title="ToInt8 ( argument )"><span class="secnum">7.1.10</span> ToInt8 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-touint8" title="ToUint8 ( argument )"><span class="secnum">7.1.11</span> ToUint8 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-touint8clamp" title="ToUint8Clamp ( argument )"><span class="secnum">7.1.12</span> ToUint8Clamp ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tobigint" title="ToBigInt ( argument )"><span class="secnum">7.1.13</span> ToBigInt ( <var>argument</var> )</a></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-stringtobigint" title="StringToBigInt ( str )"><span class="secnum">7.1.14</span> StringToBigInt ( <var>str</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-stringintegerliteral-grammar" title="StringIntegerLiteral Grammar"><span class="secnum">7.1.14.1</span> StringIntegerLiteral Grammar</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-runtime-semantics-mv-for-stringintegerliteral" title="Runtime Semantics: MV"><span class="secnum">7.1.14.2</span> RS: MV</a></li></ol></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tobigint64" title="ToBigInt64 ( argument )"><span class="secnum">7.1.15</span> ToBigInt64 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tobiguint64" title="ToBigUint64 ( argument )"><span class="secnum">7.1.16</span> ToBigUint64 ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tostring" title="ToString ( argument )"><span class="secnum">7.1.17</span> ToString ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toobject" title="ToObject ( argument )"><span class="secnum">7.1.18</span> ToObject ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-topropertykey" title="ToPropertyKey ( argument )"><span class="secnum">7.1.19</span> ToPropertyKey ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-tolength" title="ToLength ( argument )"><span class="secnum">7.1.20</span> ToLength ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-canonicalnumericindexstring" title="CanonicalNumericIndexString ( argument )"><span class="secnum">7.1.21</span> CanonicalNumericIndexString ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-toindex" title="ToIndex ( value )"><span class="secnum">7.1.22</span> ToIndex ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-testing-and-comparison-operations" title="Testing and Comparison Operations"><span class="secnum">7.2</span> Testing and Comparison Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-requireobjectcoercible" title="RequireObjectCoercible ( argument )"><span class="secnum">7.2.1</span> RequireObjectCoercible ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isarray" title="IsArray ( argument )"><span class="secnum">7.2.2</span> IsArray ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iscallable" title="IsCallable ( argument )"><span class="secnum">7.2.3</span> IsCallable ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isconstructor" title="IsConstructor ( argument )"><span class="secnum">7.2.4</span> IsConstructor ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isextensible-o" title="IsExtensible ( O )"><span class="secnum">7.2.5</span> IsExtensible ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isregexp" title="IsRegExp ( argument )"><span class="secnum">7.2.6</span> IsRegExp ( <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isstringwellformedunicode" title="Static Semantics: IsStringWellFormedUnicode ( string )"><span class="secnum">7.2.7</span> SS: IsStringWellFormedUnicode ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-sametype" title="SameType ( x, y )"><span class="secnum">7.2.8</span> SameType ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-samevalue" title="SameValue ( x, y )"><span class="secnum">7.2.9</span> SameValue ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-samevaluezero" title="SameValueZero ( x, y )"><span class="secnum">7.2.10</span> SameValueZero ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-samevaluenonnumber" title="SameValueNonNumber ( x, y )"><span class="secnum">7.2.11</span> SameValueNonNumber ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-islessthan" title="IsLessThan ( x, y, LeftFirst )"><span class="secnum">7.2.12</span> IsLessThan ( <var>x</var>, <var>y</var>, <var>LeftFirst</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-islooselyequal" title="IsLooselyEqual ( x, y )"><span class="secnum">7.2.13</span> IsLooselyEqual ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-isstrictlyequal" title="IsStrictlyEqual ( x, y )"><span class="secnum">7.2.14</span> IsStrictlyEqual ( <var>x</var>, <var>y</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-operations-on-objects" title="Operations on Objects"><span class="secnum">7.3</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-makebasicobject" title="MakeBasicObject ( internalSlotsList )"><span class="secnum">7.3.1</span> MakeBasicObject ( <var>internalSlotsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-get-o-p" title="Get ( O, P )"><span class="secnum">7.3.2</span> Get ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getv" title="GetV ( V, P )"><span class="secnum">7.3.3</span> GetV ( <var>V</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-set-o-p-v-throw" title="Set ( O, P, V, Throw )"><span class="secnum">7.3.4</span> Set ( <var>O</var>, <var>P</var>, <var>V</var>, <var>Throw</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createdataproperty" title="CreateDataProperty ( O, P, V )"><span class="secnum">7.3.5</span> CreateDataProperty ( <var>O</var>, <var>P</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createdatapropertyorthrow" title="CreateDataPropertyOrThrow ( O, P, V )"><span class="secnum">7.3.6</span> CreateDataPropertyOrThrow ( <var>O</var>, <var>P</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createnonenumerabledatapropertyorthrow" title="CreateNonEnumerableDataPropertyOrThrow ( O, P, V )"><span class="secnum">7.3.7</span> CreateNonEnumerableDataPropertyOrThrow ( <var>O</var>, <var>P</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-definepropertyorthrow" title="DefinePropertyOrThrow ( O, P, desc )"><span class="secnum">7.3.8</span> DefinePropertyOrThrow ( <var>O</var>, <var>P</var>, <var>desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-deletepropertyorthrow" title="DeletePropertyOrThrow ( O, P )"><span class="secnum">7.3.9</span> DeletePropertyOrThrow ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getmethod" title="GetMethod ( V, P )"><span class="secnum">7.3.10</span> GetMethod ( <var>V</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-hasproperty" title="HasProperty ( O, P )"><span class="secnum">7.3.11</span> HasProperty ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-hasownproperty" title="HasOwnProperty ( O, P )"><span class="secnum">7.3.12</span> HasOwnProperty ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-call" title="Call ( F, V [ , argumentsList ] )"><span class="secnum">7.3.13</span> Call ( <var>F</var>, <var>V</var> [ , <var>argumentsList</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-construct" title="Construct ( F [ , argumentsList [ , newTarget ] ] )"><span class="secnum">7.3.14</span> Construct ( <var>F</var> [ , <var>argumentsList</var> [ , <var>newTarget</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-setintegritylevel" title="SetIntegrityLevel ( O, level )"><span class="secnum">7.3.15</span> SetIntegrityLevel ( <var>O</var>, <var>level</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-testintegritylevel" title="TestIntegrityLevel ( O, level )"><span class="secnum">7.3.16</span> TestIntegrityLevel ( <var>O</var>, <var>level</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createarrayfromlist" title="CreateArrayFromList ( elements )"><span class="secnum">7.3.17</span> CreateArrayFromList ( <var>elements</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-lengthofarraylike" title="LengthOfArrayLike ( obj )"><span class="secnum">7.3.18</span> LengthOfArrayLike ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createlistfromarraylike" title="CreateListFromArrayLike ( obj [ , validElementTypes ] )"><span class="secnum">7.3.19</span> CreateListFromArrayLike ( <var>obj</var> [ , <var>validElementTypes</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-invoke" title="Invoke ( V, P [ , argumentsList ] )"><span class="secnum">7.3.20</span> Invoke ( <var>V</var>, <var>P</var> [ , <var>argumentsList</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-ordinaryhasinstance" title="OrdinaryHasInstance ( C, O )"><span class="secnum">7.3.21</span> OrdinaryHasInstance ( <var>C</var>, <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-speciesconstructor" title="SpeciesConstructor ( O, defaultConstructor )"><span class="secnum">7.3.22</span> SpeciesConstructor ( <var>O</var>, <var>defaultConstructor</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-enumerableownproperties" title="EnumerableOwnProperties ( O, kind )"><span class="secnum">7.3.23</span> EnumerableOwnProperties ( <var>O</var>, <var>kind</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getfunctionrealm" title="GetFunctionRealm ( obj )"><span class="secnum">7.3.24</span> GetFunctionRealm ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-copydataproperties" title="CopyDataProperties ( target, source, excludedItems )"><span class="secnum">7.3.25</span> CopyDataProperties ( <var>target</var>, <var>source</var>, <var>excludedItems</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-privateelementfind" title="PrivateElementFind ( O, P )"><span class="secnum">7.3.26</span> PrivateElementFind ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-privatefieldadd" title="PrivateFieldAdd ( O, P, value )"><span class="secnum">7.3.27</span> PrivateFieldAdd ( <var>O</var>, <var>P</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-privatemethodoraccessoradd" title="PrivateMethodOrAccessorAdd ( O, method )"><span class="secnum">7.3.28</span> PrivateMethodOrAccessorAdd ( <var>O</var>, <var>method</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-hostensurecanaddprivateelement" title="HostEnsureCanAddPrivateElement ( O )"><span class="secnum">7.3.29</span> HostEnsureCanAddPrivateElement ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-privateget" title="PrivateGet ( O, P )"><span class="secnum">7.3.30</span> PrivateGet ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-privateset" title="PrivateSet ( O, P, value )"><span class="secnum">7.3.31</span> PrivateSet ( <var>O</var>, <var>P</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-definefield" title="DefineField ( receiver, fieldRecord )"><span class="secnum">7.3.32</span> DefineField ( <var>receiver</var>, <var>fieldRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-initializeinstanceelements" title="InitializeInstanceElements ( O, constructor )"><span class="secnum">7.3.33</span> InitializeInstanceElements ( <var>O</var>, <var>constructor</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-add-value-to-keyed-group" title="AddValueToKeyedGroup ( groups, key, value )"><span class="secnum">7.3.34</span> AddValueToKeyedGroup ( <var>groups</var>, <var>key</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-groupby" title="GroupBy ( items, callback, keyCoercion )"><span class="secnum">7.3.35</span> GroupBy ( <var>items</var>, <var>callback</var>, <var>keyCoercion</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getoptionsobject" title="GetOptionsObject ( options )"><span class="secnum">7.3.36</span> GetOptionsObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-SetterThatIgnoresPrototypeProperties" title="SetterThatIgnoresPrototypeProperties ( thisValue, home, p, v )"><span class="secnum">7.3.37</span> SetterThatIgnoresPrototypeProperties ( <var>thisValue</var>, <var>home</var>, <var>p</var>, <var>v</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="abstract-operations.html#sec-operations-on-iterator-objects" title="Operations on Iterator Objects"><span class="secnum">7.4</span> Operations on Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iterator-records" title="Iterator Records"><span class="secnum">7.4.1</span> Iterator Records</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getiteratordirect" title="GetIteratorDirect ( obj )"><span class="secnum">7.4.2</span> GetIteratorDirect ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getiteratorfrommethod" title="GetIteratorFromMethod ( obj, method )"><span class="secnum">7.4.3</span> GetIteratorFromMethod ( <var>obj</var>, <var>method</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getiterator" title="GetIterator ( obj, kind )"><span class="secnum">7.4.4</span> GetIterator ( <var>obj</var>, <var>kind</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-getiteratorflattenable" title="GetIteratorFlattenable ( obj, primitiveHandling )"><span class="secnum">7.4.5</span> GetIteratorFlattenable ( <var>obj</var>, <var>primitiveHandling</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratornext" title="IteratorNext ( iteratorRecord [ , value ] )"><span class="secnum">7.4.6</span> IteratorNext ( <var>iteratorRecord</var> [ , <var>value</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorcomplete" title="IteratorComplete ( iteratorResult )"><span class="secnum">7.4.7</span> IteratorComplete ( <var>iteratorResult</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorvalue" title="IteratorValue ( iteratorResult )"><span class="secnum">7.4.8</span> IteratorValue ( <var>iteratorResult</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorstep" title="IteratorStep ( iteratorRecord )"><span class="secnum">7.4.9</span> IteratorStep ( <var>iteratorRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorstepvalue" title="IteratorStepValue ( iteratorRecord )"><span class="secnum">7.4.10</span> IteratorStepValue ( <var>iteratorRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorclose" title="IteratorClose ( iteratorRecord, completion )"><span class="secnum">7.4.11</span> IteratorClose ( <var>iteratorRecord</var>, <var>completion</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratorcloseall" title="IteratorCloseAll ( iters, completion )"><span class="secnum">7.4.12</span> IteratorCloseAll ( <var>iters</var>, <var>completion</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-ifabruptcloseiterator" title="IfAbruptCloseIterator ( value, iteratorRecord )"><span class="secnum">7.4.13</span> IfAbruptCloseIterator ( <var>value</var>, <var>iteratorRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-asynciteratorclose" title="AsyncIteratorClose ( iteratorRecord, completion )"><span class="secnum">7.4.14</span> AsyncIteratorClose ( <var>iteratorRecord</var>, <var>completion</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-ifabruptcloseasynciterator" title="IfAbruptCloseAsyncIterator ( value, iteratorRecord )"><span class="secnum">7.4.15</span> IfAbruptCloseAsyncIterator ( <var>value</var>, <var>iteratorRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createiterresultobject" title="CreateIteratorResultObject ( value, done )"><span class="secnum">7.4.16</span> CreateIteratorResultObject ( <var>value</var>, <var>done</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-createlistiteratorRecord" title="CreateListIteratorRecord ( list )"><span class="secnum">7.4.17</span> CreateListIteratorRecord ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="abstract-operations.html#sec-iteratortolist" title="IteratorToList ( iteratorRecord )"><span class="secnum">7.4.18</span> IteratorToList ( <var>iteratorRecord</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">8</span> Syntax-Directed Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">8.1</span> RS: Evaluation</a></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations-scope-analysis" title="Scope Analysis"><span class="secnum">8.2</span> Scope Analysis</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-boundnames" title="Static Semantics: BoundNames"><span class="secnum">8.2.1</span> SS: BoundNames</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-declarationpart" title="Static Semantics: DeclarationPart"><span class="secnum">8.2.2</span> SS: DeclarationPart</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-isconstantdeclaration" title="Static Semantics: IsConstantDeclaration"><span class="secnum">8.2.3</span> SS: IsConstantDeclaration</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-lexicallydeclarednames" title="Static Semantics: LexicallyDeclaredNames"><span class="secnum">8.2.4</span> SS: LexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-lexicallyscopeddeclarations" title="Static Semantics: LexicallyScopedDeclarations"><span class="secnum">8.2.5</span> SS: LexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-vardeclarednames" title="Static Semantics: VarDeclaredNames"><span class="secnum">8.2.6</span> SS: VarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-varscopeddeclarations" title="Static Semantics: VarScopedDeclarations"><span class="secnum">8.2.7</span> SS: VarScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-toplevellexicallydeclarednames" title="Static Semantics: TopLevelLexicallyDeclaredNames"><span class="secnum">8.2.8</span> SS: TopLevelLexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-toplevellexicallyscopeddeclarations" title="Static Semantics: TopLevelLexicallyScopedDeclarations"><span class="secnum">8.2.9</span> SS: TopLevelLexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-toplevelvardeclarednames" title="Static Semantics: TopLevelVarDeclaredNames"><span class="secnum">8.2.10</span> SS: TopLevelVarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-toplevelvarscopeddeclarations" title="Static Semantics: TopLevelVarScopedDeclarations"><span class="secnum">8.2.11</span> SS: TopLevelVarScopedDeclarations</a></li></ol></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations-labels" title="Labels"><span class="secnum">8.3</span> Labels</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-containsduplicatelabels" title="Static Semantics: ContainsDuplicateLabels"><span class="secnum">8.3.1</span> SS: ContainsDuplicateLabels</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-containsundefinedbreaktarget" title="Static Semantics: ContainsUndefinedBreakTarget"><span class="secnum">8.3.2</span> SS: ContainsUndefinedBreakTarget</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-containsundefinedcontinuetarget" title="Static Semantics: ContainsUndefinedContinueTarget"><span class="secnum">8.3.3</span> SS: ContainsUndefinedContinueTarget</a></li></ol></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations-function-name-inference" title="Function Name Inference"><span class="secnum">8.4</span> Function Name Inference</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-hasname" title="Static Semantics: HasName"><span class="secnum">8.4.1</span> SS: HasName</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-isfunctiondefinition" title="Static Semantics: IsFunctionDefinition"><span class="secnum">8.4.2</span> SS: IsFunctionDefinition</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-isanonymousfunctiondefinition" title="Static Semantics: IsAnonymousFunctionDefinition ( expr )"><span class="secnum">8.4.3</span> SS: IsAnonymousFunctionDefinition ( <var>expr</var> )</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-isidentifierref" title="Static Semantics: IsIdentifierRef"><span class="secnum">8.4.4</span> SS: IsIdentifierRef</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-runtime-semantics-namedevaluation" title="Runtime Semantics: NamedEvaluation"><span class="secnum">8.4.5</span> RS: NamedEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations-contains" title="Contains"><span class="secnum">8.5</span> Contains</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-contains" title="Static Semantics: Contains"><span class="secnum">8.5.1</span> SS: Contains</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-computedpropertycontains" title="Static Semantics: ComputedPropertyContains"><span class="secnum">8.5.2</span> SS: ComputedPropertyContains</a></li></ol></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-syntax-directed-operations-miscellaneous" title="Miscellaneous"><span class="secnum">8.6</span> Miscellaneous</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-runtime-semantics-instantiatefunctionobject" title="Runtime Semantics: InstantiateFunctionObject"><span class="secnum">8.6.1</span> RS: InstantiateFunctionObject</a></li><li><span class="item-toggle">+</span><a href="syntax-directed-operations.html#sec-runtime-semantics-bindinginitialization" title="Runtime Semantics: BindingInitialization"><span class="secnum">8.6.2</span> RS: BindingInitialization</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-initializeboundname" title="InitializeBoundName ( name, value, environment )"><span class="secnum">8.6.2.1</span> InitializeBoundName ( <var>name</var>, <var>value</var>, <var>environment</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-runtime-semantics-iteratorbindinginitialization" title="Runtime Semantics: IteratorBindingInitialization"><span class="secnum">8.6.3</span> RS: IteratorBindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-assignmenttargettype" title="Static Semantics: AssignmentTargetType"><span class="secnum">8.6.4</span> SS: AssignmentTargetType</a></li><li><span class="item-toggle-none"></span><a href="syntax-directed-operations.html#sec-static-semantics-propname" title="Static Semantics: PropName"><span class="secnum">8.6.5</span> SS: PropName</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-executable-code-and-execution-contexts" title="Executable Code and Execution Contexts"><span class="secnum">9</span> Executable Code and Execution Contexts</a><ol class="toc"><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-environment-records" title="Environment Records"><span class="secnum">9.1</span> Environment Records</a><ol class="toc"><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-the-environment-record-type-hierarchy" title="The Environment Record Type Hierarchy"><span class="secnum">9.1.1</span> The Environment Record Type Hierarchy</a><ol class="toc"><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records" title="Declarative Environment Records"><span class="secnum">9.1.1.1</span> Declarative Environment Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-hasbinding-n" title="HasBinding ( N )"><span class="secnum">9.1.1.1.1</span> HasBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-createmutablebinding-n-d" title="CreateMutableBinding ( N, D )"><span class="secnum">9.1.1.1.2</span> CreateMutableBinding ( <var>N</var>, <var>D</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-createimmutablebinding-n-s" title="CreateImmutableBinding ( N, S )"><span class="secnum">9.1.1.1.3</span> CreateImmutableBinding ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-initializebinding-n-v" title="InitializeBinding ( N, V )"><span class="secnum">9.1.1.1.4</span> InitializeBinding ( <var>N</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-setmutablebinding-n-v-s" title="SetMutableBinding ( N, V, S )"><span class="secnum">9.1.1.1.5</span> SetMutableBinding ( <var>N</var>, <var>V</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-getbindingvalue-n-s" title="GetBindingValue ( N, S )"><span class="secnum">9.1.1.1.6</span> GetBindingValue ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-deletebinding-n" title="DeleteBinding ( N )"><span class="secnum">9.1.1.1.7</span> DeleteBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-hasthisbinding" title="HasThisBinding ( )"><span class="secnum">9.1.1.1.8</span> HasThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-getthisbinding" title="GetThisBinding ( )"><span class="secnum">9.1.1.1.9</span> GetThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-hassuperbinding" title="HasSuperBinding ( )"><span class="secnum">9.1.1.1.10</span> HasSuperBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-declarative-environment-records-withbaseobject" title="WithBaseObject ( )"><span class="secnum">9.1.1.1.11</span> WithBaseObject ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records" title="Object Environment Records"><span class="secnum">9.1.1.2</span> Object Environment Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-hasbinding-n" title="HasBinding ( N )"><span class="secnum">9.1.1.2.1</span> HasBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-createmutablebinding-n-d" title="CreateMutableBinding ( N, D )"><span class="secnum">9.1.1.2.2</span> CreateMutableBinding ( <var>N</var>, <var>D</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-createimmutablebinding-n-s" title="CreateImmutableBinding ( N, S )"><span class="secnum">9.1.1.2.3</span> CreateImmutableBinding ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-initializebinding-n-v" title="InitializeBinding ( N, V )"><span class="secnum">9.1.1.2.4</span> InitializeBinding ( <var>N</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-setmutablebinding-n-v-s" title="SetMutableBinding ( N, V, S )"><span class="secnum">9.1.1.2.5</span> SetMutableBinding ( <var>N</var>, <var>V</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-getbindingvalue-n-s" title="GetBindingValue ( N, S )"><span class="secnum">9.1.1.2.6</span> GetBindingValue ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-deletebinding-n" title="DeleteBinding ( N )"><span class="secnum">9.1.1.2.7</span> DeleteBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-hasthisbinding" title="HasThisBinding ( )"><span class="secnum">9.1.1.2.8</span> HasThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-getthisbinding" title="GetThisBinding ( )"><span class="secnum">9.1.1.2.9</span> GetThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-hassuperbinding" title="HasSuperBinding ( )"><span class="secnum">9.1.1.2.10</span> HasSuperBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-object-environment-records-withbaseobject" title="WithBaseObject ( )"><span class="secnum">9.1.1.2.11</span> WithBaseObject ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-function-environment-records" title="Function Environment Records"><span class="secnum">9.1.1.3</span> Function Environment Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-bindthisvalue" title="BindThisValue ( envRec, V )"><span class="secnum">9.1.1.3.1</span> BindThisValue ( <var>envRec</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-function-environment-records-hasthisbinding" title="HasThisBinding ( )"><span class="secnum">9.1.1.3.2</span> HasThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-function-environment-records-getthisbinding" title="GetThisBinding ( )"><span class="secnum">9.1.1.3.3</span> GetThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-function-environment-records-hassuperbinding" title="HasSuperBinding ( )"><span class="secnum">9.1.1.3.4</span> HasSuperBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getsuperbase" title="GetSuperBase ( envRec )"><span class="secnum">9.1.1.3.5</span> GetSuperBase ( <var>envRec</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records" title="Global Environment Records"><span class="secnum">9.1.1.4</span> Global Environment Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-hasbinding-n" title="HasBinding ( N )"><span class="secnum">9.1.1.4.1</span> HasBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-createmutablebinding-n-d" title="CreateMutableBinding ( N, D )"><span class="secnum">9.1.1.4.2</span> CreateMutableBinding ( <var>N</var>, <var>D</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-createimmutablebinding-n-s" title="CreateImmutableBinding ( N, S )"><span class="secnum">9.1.1.4.3</span> CreateImmutableBinding ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-initializebinding-n-v" title="InitializeBinding ( N, V )"><span class="secnum">9.1.1.4.4</span> InitializeBinding ( <var>N</var>, <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-setmutablebinding-n-v-s" title="SetMutableBinding ( N, V, S )"><span class="secnum">9.1.1.4.5</span> SetMutableBinding ( <var>N</var>, <var>V</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-getbindingvalue-n-s" title="GetBindingValue ( N, S )"><span class="secnum">9.1.1.4.6</span> GetBindingValue ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-deletebinding-n" title="DeleteBinding ( N )"><span class="secnum">9.1.1.4.7</span> DeleteBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-hasthisbinding" title="HasThisBinding ( )"><span class="secnum">9.1.1.4.8</span> HasThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-getthisbinding" title="GetThisBinding ( )"><span class="secnum">9.1.1.4.9</span> GetThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-hassuperbinding" title="HasSuperBinding ( )"><span class="secnum">9.1.1.4.10</span> HasSuperBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-global-environment-records-withbaseobject" title="WithBaseObject ( )"><span class="secnum">9.1.1.4.11</span> WithBaseObject ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-haslexicaldeclaration" title="HasLexicalDeclaration ( envRec, N )"><span class="secnum">9.1.1.4.12</span> HasLexicalDeclaration ( <var>envRec</var>, <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hasrestrictedglobalproperty" title="HasRestrictedGlobalProperty ( envRec, N )"><span class="secnum">9.1.1.4.13</span> HasRestrictedGlobalProperty ( <var>envRec</var>, <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-candeclareglobalvar" title="CanDeclareGlobalVar ( envRec, N )"><span class="secnum">9.1.1.4.14</span> CanDeclareGlobalVar ( <var>envRec</var>, <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-candeclareglobalfunction" title="CanDeclareGlobalFunction ( envRec, N )"><span class="secnum">9.1.1.4.15</span> CanDeclareGlobalFunction ( <var>envRec</var>, <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-createglobalvarbinding" title="CreateGlobalVarBinding ( envRec, N, D )"><span class="secnum">9.1.1.4.16</span> CreateGlobalVarBinding ( <var>envRec</var>, <var>N</var>, <var>D</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-createglobalfunctionbinding" title="CreateGlobalFunctionBinding ( envRec, N, V, D )"><span class="secnum">9.1.1.4.17</span> CreateGlobalFunctionBinding ( <var>envRec</var>, <var>N</var>, <var>V</var>, <var>D</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-module-environment-records" title="Module Environment Records"><span class="secnum">9.1.1.5</span> Module Environment Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-module-environment-records-getbindingvalue-n-s" title="GetBindingValue ( N, S )"><span class="secnum">9.1.1.5.1</span> GetBindingValue ( <var>N</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-module-environment-records-deletebinding-n" title="DeleteBinding ( N )"><span class="secnum">9.1.1.5.2</span> DeleteBinding ( <var>N</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-module-environment-records-hasthisbinding" title="HasThisBinding ( )"><span class="secnum">9.1.1.5.3</span> HasThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-module-environment-records-getthisbinding" title="GetThisBinding ( )"><span class="secnum">9.1.1.5.4</span> GetThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-createimportbinding" title="CreateImportBinding ( envRec, N, M, N2 )"><span class="secnum">9.1.1.5.5</span> CreateImportBinding ( <var>envRec</var>, <var>N</var>, <var>M</var>, <var>N2</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-environment-record-operations" title="Environment Record Operations"><span class="secnum">9.1.2</span> Environment Record Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getidentifierreference" title="GetIdentifierReference ( env, name, strict )"><span class="secnum">9.1.2.1</span> GetIdentifierReference ( <var>env</var>, <var>name</var>, <var>strict</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newdeclarativeenvironment" title="NewDeclarativeEnvironment ( E )"><span class="secnum">9.1.2.2</span> NewDeclarativeEnvironment ( <var>E</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newobjectenvironment" title="NewObjectEnvironment ( O, W, E )"><span class="secnum">9.1.2.3</span> NewObjectEnvironment ( <var>O</var>, <var>W</var>, <var>E</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newfunctionenvironment" title="NewFunctionEnvironment ( F, newTarget )"><span class="secnum">9.1.2.4</span> NewFunctionEnvironment ( <var>F</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newglobalenvironment" title="NewGlobalEnvironment ( G, thisValue )"><span class="secnum">9.1.2.5</span> NewGlobalEnvironment ( <var>G</var>, <var>thisValue</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newmoduleenvironment" title="NewModuleEnvironment ( E )"><span class="secnum">9.1.2.6</span> NewModuleEnvironment ( <var>E</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-privateenvironment-records" title="PrivateEnvironment Records"><span class="secnum">9.2</span> PrivateEnvironment Records</a><ol class="toc"><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-privateenvironment-record-operations" title="PrivateEnvironment Record Operations"><span class="secnum">9.2.1</span> PrivateEnvironment Record Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-newprivateenvironment" title="NewPrivateEnvironment ( outerPrivateEnv )"><span class="secnum">9.2.1.1</span> NewPrivateEnvironment ( <var>outerPrivateEnv</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-resolve-private-identifier" title="ResolvePrivateIdentifier ( privateEnv, identifier )"><span class="secnum">9.2.1.2</span> ResolvePrivateIdentifier ( <var>privateEnv</var>, <var>identifier</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-code-realms" title="Realms"><span class="secnum">9.3</span> Realms</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-initializehostdefinedrealm" title="InitializeHostDefinedRealm ( )"><span class="secnum">9.3.1</span> InitializeHostDefinedRealm ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-createintrinsics" title="CreateIntrinsics ( realmRec )"><span class="secnum">9.3.2</span> CreateIntrinsics ( <var>realmRec</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-setdefaultglobalbindings" title="SetDefaultGlobalBindings ( realmRec )"><span class="secnum">9.3.3</span> SetDefaultGlobalBindings ( <var>realmRec</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-execution-contexts" title="Execution Contexts"><span class="secnum">9.4</span> Execution Contexts</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getactivescriptormodule" title="GetActiveScriptOrModule ( )"><span class="secnum">9.4.1</span> GetActiveScriptOrModule ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-resolvebinding" title="ResolveBinding ( name [ , env ] )"><span class="secnum">9.4.2</span> ResolveBinding ( <var>name</var> [ , <var>env</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getthisenvironment" title="GetThisEnvironment ( )"><span class="secnum">9.4.3</span> GetThisEnvironment ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-resolvethisbinding" title="ResolveThisBinding ( )"><span class="secnum">9.4.4</span> ResolveThisBinding ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getnewtarget" title="GetNewTarget ( )"><span class="secnum">9.4.5</span> GetNewTarget ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-getglobalobject" title="GetGlobalObject ( )"><span class="secnum">9.4.6</span> GetGlobalObject ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-jobs" title="Jobs and Host Operations to Enqueue Jobs"><span class="secnum">9.5</span> Jobs and Host Operations to Enqueue Jobs</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-jobcallback-records" title="JobCallback Records"><span class="secnum">9.5.1</span> JobCallback Records</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hostmakejobcallback" title="HostMakeJobCallback ( callback )"><span class="secnum">9.5.2</span> HostMakeJobCallback ( <var>callback</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hostcalljobcallback" title="HostCallJobCallback ( jobCallback, V, argumentsList )"><span class="secnum">9.5.3</span> HostCallJobCallback ( <var>jobCallback</var>, <var>V</var>, <var>argumentsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hostenqueuegenericjob" title="HostEnqueueGenericJob ( job, realm )"><span class="secnum">9.5.4</span> HostEnqueueGenericJob ( <var>job</var>, <var>realm</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hostenqueuepromisejob" title="HostEnqueuePromiseJob ( job, realm )"><span class="secnum">9.5.5</span> HostEnqueuePromiseJob ( <var>job</var>, <var>realm</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-hostenqueuetimeoutjob" title="HostEnqueueTimeoutJob ( timeoutJob, realm, milliseconds )"><span class="secnum">9.5.6</span> HostEnqueueTimeoutJob ( <var>timeoutJob</var>, <var>realm</var>, <var>milliseconds</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-agents" title="Agents"><span class="secnum">9.6</span> Agents</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-agentsignifier" title="AgentSignifier ( )"><span class="secnum">9.6.1</span> AgentSignifier ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-agentcansuspend" title="AgentCanSuspend ( )"><span class="secnum">9.6.2</span> AgentCanSuspend ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-IncrementModuleAsyncEvaluationCount" title="IncrementModuleAsyncEvaluationCount ( )"><span class="secnum">9.6.3</span> IncrementModuleAsyncEvaluationCount ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-agent-clusters" title="Agent Clusters"><span class="secnum">9.7</span> Agent Clusters</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-forward-progress" title="Forward Progress"><span class="secnum">9.8</span> Forward Progress</a></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-weakref-processing-model" title="Processing Model of WeakRef and FinalizationRegistry Targets"><span class="secnum">9.9</span> Processing Model of WeakRef and FinalizationRegistry Targets</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-weakref-invariants" title="Objectives"><span class="secnum">9.9.1</span> Objectives</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-liveness" title="Liveness"><span class="secnum">9.9.2</span> Liveness</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-weakref-execution" title="Execution"><span class="secnum">9.9.3</span> Execution</a></li><li><span class="item-toggle">+</span><a href="executable-code-and-execution-contexts.html#sec-weakref-host-hooks" title="Host Hooks"><span class="secnum">9.9.4</span> Host Hooks</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-host-cleanup-finalization-registry" title="HostEnqueueFinalizationRegistryCleanupJob ( finalizationRegistry )"><span class="secnum">9.9.4.1</span> HostEnqueueFinalizationRegistryCleanupJob ( <var>finalizationRegistry</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-clear-kept-objects" title="ClearKeptObjects ( )"><span class="secnum">9.10</span> ClearKeptObjects ( )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-addtokeptobjects" title="AddToKeptObjects ( value )"><span class="secnum">9.11</span> AddToKeptObjects ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-cleanup-finalization-registry" title="CleanupFinalizationRegistry ( finalizationRegistry )"><span class="secnum">9.12</span> CleanupFinalizationRegistry ( <var>finalizationRegistry</var> )</a></li><li><span class="item-toggle-none"></span><a href="executable-code-and-execution-contexts.html#sec-canbeheldweakly" title="CanBeHeldWeakly ( v )"><span class="secnum">9.13</span> CanBeHeldWeakly ( <var>v</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-and-exotic-objects-behaviours" title="Ordinary and Exotic Objects Behaviours"><span class="secnum">10</span> Ordinary and Exotic Objects Behaviours</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots" title="Ordinary Object Internal Methods and Internal Slots"><span class="secnum">10.1</span> Ordinary Object Internal Methods and Internal Slots</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-getprototypeof" title="[[GetPrototypeOf]] ( )"><span class="secnum">10.1.1</span> <var class="field">[[GetPrototypeOf]]</var> ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarygetprototypeof" title="OrdinaryGetPrototypeOf ( O )"><span class="secnum">10.1.1.1</span> OrdinaryGetPrototypeOf ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-setprototypeof-v" title="[[SetPrototypeOf]] ( V )"><span class="secnum">10.1.2</span> <var class="field">[[SetPrototypeOf]]</var> ( <var>V</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarysetprototypeof" title="OrdinarySetPrototypeOf ( O, V )"><span class="secnum">10.1.2.1</span> OrdinarySetPrototypeOf ( <var>O</var>, <var>V</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-isextensible" title="[[IsExtensible]] ( )"><span class="secnum">10.1.3</span> <var class="field">[[IsExtensible]]</var> ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryisextensible" title="OrdinaryIsExtensible ( O )"><span class="secnum">10.1.3.1</span> OrdinaryIsExtensible ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-preventextensions" title="[[PreventExtensions]] ( )"><span class="secnum">10.1.4</span> <var class="field">[[PreventExtensions]]</var> ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarypreventextensions" title="OrdinaryPreventExtensions ( O )"><span class="secnum">10.1.4.1</span> OrdinaryPreventExtensions ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-getownproperty-p" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.1.5</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarygetownproperty" title="OrdinaryGetOwnProperty ( O, P )"><span class="secnum">10.1.5.1</span> OrdinaryGetOwnProperty ( <var>O</var>, <var>P</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.1.6</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarydefineownproperty" title="OrdinaryDefineOwnProperty ( O, P, Desc )"><span class="secnum">10.1.6.1</span> OrdinaryDefineOwnProperty ( <var>O</var>, <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-iscompatiblepropertydescriptor" title="IsCompatiblePropertyDescriptor ( Extensible, Desc, Current )"><span class="secnum">10.1.6.2</span> IsCompatiblePropertyDescriptor ( <var>Extensible</var>, <var>Desc</var>, <var>Current</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-validateandapplypropertydescriptor" title="ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )"><span class="secnum">10.1.6.3</span> ValidateAndApplyPropertyDescriptor ( <var>O</var>, <var>P</var>, <var>extensible</var>, <var>Desc</var>, <var>current</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-hasproperty-p" title="[[HasProperty]] ( P )"><span class="secnum">10.1.7</span> <var class="field">[[HasProperty]]</var> ( <var>P</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryhasproperty" title="OrdinaryHasProperty ( O, P )"><span class="secnum">10.1.7.1</span> OrdinaryHasProperty ( <var>O</var>, <var>P</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-get-p-receiver" title="[[Get]] ( P, Receiver )"><span class="secnum">10.1.8</span> <var class="field">[[Get]]</var> ( <var>P</var>, <var>Receiver</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryget" title="OrdinaryGet ( O, P, Receiver )"><span class="secnum">10.1.8.1</span> OrdinaryGet ( <var>O</var>, <var>P</var>, <var>Receiver</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-set-p-v-receiver" title="[[Set]] ( P, V, Receiver )"><span class="secnum">10.1.9</span> <var class="field">[[Set]]</var> ( <var>P</var>, <var>V</var>, <var>Receiver</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryset" title="OrdinarySet ( O, P, V, Receiver )"><span class="secnum">10.1.9.1</span> OrdinarySet ( <var>O</var>, <var>P</var>, <var>V</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarysetwithowndescriptor" title="OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )"><span class="secnum">10.1.9.2</span> OrdinarySetWithOwnDescriptor ( <var>O</var>, <var>P</var>, <var>V</var>, <var>Receiver</var>, <var>ownDesc</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-delete-p" title="[[Delete]] ( P )"><span class="secnum">10.1.10</span> <var class="field">[[Delete]]</var> ( <var>P</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarydelete" title="OrdinaryDelete ( O, P )"><span class="secnum">10.1.10.1</span> OrdinaryDelete ( <var>O</var>, <var>P</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinary-object-internal-methods-and-internal-slots-ownpropertykeys" title="[[OwnPropertyKeys]] ( )"><span class="secnum">10.1.11</span> <var class="field">[[OwnPropertyKeys]]</var> ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryownpropertykeys" title="OrdinaryOwnPropertyKeys ( O )"><span class="secnum">10.1.11.1</span> OrdinaryOwnPropertyKeys ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryobjectcreate" title="OrdinaryObjectCreate ( proto [ , additionalInternalSlotsList ] )"><span class="secnum">10.1.12</span> OrdinaryObjectCreate ( <var>proto</var> [ , <var>additionalInternalSlotsList</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycreatefromconstructor" title="OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , internalSlotsList ] )"><span class="secnum">10.1.13</span> OrdinaryCreateFromConstructor ( <var>constructor</var>, <var>intrinsicDefaultProto</var> [ , <var>internalSlotsList</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-getprototypefromconstructor" title="GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto )"><span class="secnum">10.1.14</span> GetPrototypeFromConstructor ( <var>constructor</var>, <var>intrinsicDefaultProto</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot" title="RequireInternalSlot ( O, internalSlot )"><span class="secnum">10.1.15</span> RequireInternalSlot ( <var>O</var>, <var>internalSlot</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ecmascript-function-objects" title="ECMAScript Function Objects"><span class="secnum">10.2</span> ECMAScript Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ecmascript-function-objects-call-thisargument-argumentslist" title="[[Call]] ( thisArgument, argumentsList )"><span class="secnum">10.2.1</span> <var class="field">[[Call]]</var> ( <var>thisArgument</var>, <var>argumentsList</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-prepareforordinarycall" title="PrepareForOrdinaryCall ( F, newTarget )"><span class="secnum">10.2.1.1</span> PrepareForOrdinaryCall ( <var>F</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycallbindthis" title="OrdinaryCallBindThis ( F, calleeContext, thisArgument )"><span class="secnum">10.2.1.2</span> OrdinaryCallBindThis ( <var>F</var>, <var>calleeContext</var>, <var>thisArgument</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-runtime-semantics-evaluatebody" title="Runtime Semantics: EvaluateBody"><span class="secnum">10.2.1.3</span> RS: EvaluateBody</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycallevaluatebody" title="OrdinaryCallEvaluateBody ( F, argumentsList )"><span class="secnum">10.2.1.4</span> OrdinaryCallEvaluateBody ( <var>F</var>, <var>argumentsList</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ecmascript-function-objects-construct-argumentslist-newtarget" title="[[Construct]] ( argumentsList, newTarget )"><span class="secnum">10.2.2</span> <var class="field">[[Construct]]</var> ( <var>argumentsList</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryfunctioncreate" title="OrdinaryFunctionCreate ( functionPrototype, sourceText, ParameterList, Body, thisMode, env, privateEnv )"><span class="secnum">10.2.3</span> OrdinaryFunctionCreate ( <var>functionPrototype</var>, <var>sourceText</var>, <var>ParameterList</var>, <var>Body</var>, <var>thisMode</var>, <var>env</var>, <var>privateEnv</var> )</a></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-addrestrictedfunctionproperties" title="AddRestrictedFunctionProperties ( F, realm )"><span class="secnum">10.2.4</span> AddRestrictedFunctionProperties ( <var>F</var>, <var>realm</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-%throwtypeerror%" title="%ThrowTypeError% ( )"><span class="secnum">10.2.4.1</span> %ThrowTypeError% ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-makeconstructor" title="MakeConstructor ( F [ , writablePrototype [ , prototype ] ] )"><span class="secnum">10.2.5</span> MakeConstructor ( <var>F</var> [ , <var>writablePrototype</var> [ , <var>prototype</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-makeclassconstructor" title="MakeClassConstructor ( F )"><span class="secnum">10.2.6</span> MakeClassConstructor ( <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-makemethod" title="MakeMethod ( F, homeObject )"><span class="secnum">10.2.7</span> MakeMethod ( <var>F</var>, <var>homeObject</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-definemethodproperty" title="DefineMethodProperty ( homeObject, key, closure, enumerable )"><span class="secnum">10.2.8</span> DefineMethodProperty ( <var>homeObject</var>, <var>key</var>, <var>closure</var>, <var>enumerable</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-setfunctionname" title="SetFunctionName ( F, name [ , prefix ] )"><span class="secnum">10.2.9</span> SetFunctionName ( <var>F</var>, <var>name</var> [ , <var>prefix</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-setfunctionlength" title="SetFunctionLength ( F, length )"><span class="secnum">10.2.10</span> SetFunctionLength ( <var>F</var>, <var>length</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-functiondeclarationinstantiation" title="FunctionDeclarationInstantiation ( func, argumentsList )"><span class="secnum">10.2.11</span> FunctionDeclarationInstantiation ( <var>func</var>, <var>argumentsList</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-built-in-function-objects" title="Built-in Function Objects"><span class="secnum">10.3</span> Built-in Function Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-built-in-function-objects-call-thisargument-argumentslist" title="[[Call]] ( thisArgument, argumentsList )"><span class="secnum">10.3.1</span> <var class="field">[[Call]]</var> ( <var>thisArgument</var>, <var>argumentsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-built-in-function-objects-construct-argumentslist-newtarget" title="[[Construct]] ( argumentsList, newTarget )"><span class="secnum">10.3.2</span> <var class="field">[[Construct]]</var> ( <var>argumentsList</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-builtincallorconstruct" title="BuiltinCallOrConstruct ( F, thisArgument, argumentsList, newTarget )"><span class="secnum">10.3.3</span> BuiltinCallOrConstruct ( <var>F</var>, <var>thisArgument</var>, <var>argumentsList</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-createbuiltinfunction" title="CreateBuiltinFunction ( behaviour, length, name, additionalInternalSlotsList [ , realm [ , prototype [ , prefix [ , async ] ] ] ] )"><span class="secnum">10.3.4</span> CreateBuiltinFunction ( <var>behaviour</var>, <var>length</var>, <var>name</var>, <var>additionalInternalSlotsList</var> [ , <var>realm</var> [ , <var>prototype</var> [ , <var>prefix</var> [ , <var>async</var> ] ] ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-built-in-exotic-object-internal-methods-and-slots" title="Built-in Exotic Object Internal Methods and Slots"><span class="secnum">10.4</span> Built-in Exotic Object Internal Methods and Slots</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-bound-function-exotic-objects" title="Bound Function Exotic Objects"><span class="secnum">10.4.1</span> Bound Function Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-bound-function-exotic-objects-call-thisargument-argumentslist" title="[[Call]] ( thisArgument, argumentsList )"><span class="secnum">10.4.1.1</span> <var class="field">[[Call]]</var> ( <var>thisArgument</var>, <var>argumentsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-bound-function-exotic-objects-construct-argumentslist-newtarget" title="[[Construct]] ( argumentsList, newTarget )"><span class="secnum">10.4.1.2</span> <var class="field">[[Construct]]</var> ( <var>argumentsList</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-boundfunctioncreate" title="BoundFunctionCreate ( targetFunction, boundThis, boundArgs )"><span class="secnum">10.4.1.3</span> BoundFunctionCreate ( <var>targetFunction</var>, <var>boundThis</var>, <var>boundArgs</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-array-exotic-objects" title="Array Exotic Objects"><span class="secnum">10.4.2</span> Array Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-array-exotic-objects-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.4.2.1</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arraycreate" title="ArrayCreate ( length [ , proto ] )"><span class="secnum">10.4.2.2</span> ArrayCreate ( <var>length</var> [ , <var>proto</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arrayspeciescreate" title="ArraySpeciesCreate ( originalArray, length )"><span class="secnum">10.4.2.3</span> ArraySpeciesCreate ( <var>originalArray</var>, <var>length</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arraysetlength" title="ArraySetLength ( A, Desc )"><span class="secnum">10.4.2.4</span> ArraySetLength ( <var>A</var>, <var>Desc</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-string-exotic-objects" title="String Exotic Objects"><span class="secnum">10.4.3</span> String Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-string-exotic-objects-getownproperty-p" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.4.3.1</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-string-exotic-objects-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.4.3.2</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-string-exotic-objects-ownpropertykeys" title="[[OwnPropertyKeys]] ( )"><span class="secnum">10.4.3.3</span> <var class="field">[[OwnPropertyKeys]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-stringcreate" title="StringCreate ( value, prototype )"><span class="secnum">10.4.3.4</span> StringCreate ( <var>value</var>, <var>prototype</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-stringgetownproperty" title="StringGetOwnProperty ( S, P )"><span class="secnum">10.4.3.5</span> StringGetOwnProperty ( <var>S</var>, <var>P</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects" title="Arguments Exotic Objects"><span class="secnum">10.4.4</span> Arguments Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects-getownproperty-p" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.4.4.1</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.4.4.2</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects-get-p-receiver" title="[[Get]] ( P, Receiver )"><span class="secnum">10.4.4.3</span> <var class="field">[[Get]]</var> ( <var>P</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects-set-p-v-receiver" title="[[Set]] ( P, V, Receiver )"><span class="secnum">10.4.4.4</span> <var class="field">[[Set]]</var> ( <var>P</var>, <var>V</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-arguments-exotic-objects-delete-p" title="[[Delete]] ( P )"><span class="secnum">10.4.4.5</span> <var class="field">[[Delete]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-createunmappedargumentsobject" title="CreateUnmappedArgumentsObject ( argumentsList )"><span class="secnum">10.4.4.6</span> CreateUnmappedArgumentsObject ( <var>argumentsList</var> )</a></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-createmappedargumentsobject" title="CreateMappedArgumentsObject ( func, formals, argumentsList, env )"><span class="secnum">10.4.4.7</span> CreateMappedArgumentsObject ( <var>func</var>, <var>formals</var>, <var>argumentsList</var>, <var>env</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-makearggetter" title="MakeArgGetter ( name, env )"><span class="secnum">10.4.4.7.1</span> MakeArgGetter ( <var>name</var>, <var>env</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-makeargsetter" title="MakeArgSetter ( name, env )"><span class="secnum">10.4.4.7.2</span> MakeArgSetter ( <var>name</var>, <var>env</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-exotic-objects" title="TypedArray Exotic Objects"><span class="secnum">10.4.5</span> TypedArray Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-preventextensions" title="[[PreventExtensions]] ( )"><span class="secnum">10.4.5.1</span> <var class="field">[[PreventExtensions]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-getownproperty" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.4.5.2</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-hasproperty" title="[[HasProperty]] ( P )"><span class="secnum">10.4.5.3</span> <var class="field">[[HasProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-defineownproperty" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.4.5.4</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-get" title="[[Get]] ( P, Receiver )"><span class="secnum">10.4.5.5</span> <var class="field">[[Get]]</var> ( <var>P</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-set" title="[[Set]] ( P, V, Receiver )"><span class="secnum">10.4.5.6</span> <var class="field">[[Set]]</var> ( <var>P</var>, <var>V</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-delete" title="[[Delete]] ( P )"><span class="secnum">10.4.5.7</span> <var class="field">[[Delete]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-ownpropertykeys" title="[[OwnPropertyKeys]] ( )"><span class="secnum">10.4.5.8</span> <var class="field">[[OwnPropertyKeys]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-with-buffer-witness-records" title="TypedArray With Buffer Witness Records"><span class="secnum">10.4.5.9</span> TypedArray With Buffer Witness Records</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-maketypedarraywithbufferwitnessrecord" title="MakeTypedArrayWithBufferWitnessRecord ( obj, order )"><span class="secnum">10.4.5.10</span> MakeTypedArrayWithBufferWitnessRecord ( <var>obj</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraycreate" title="TypedArrayCreate ( prototype )"><span class="secnum">10.4.5.11</span> TypedArrayCreate ( <var>prototype</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraybytelength" title="TypedArrayByteLength ( taRecord )"><span class="secnum">10.4.5.12</span> TypedArrayByteLength ( <var>taRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraylength" title="TypedArrayLength ( taRecord )"><span class="secnum">10.4.5.13</span> TypedArrayLength ( <var>taRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-istypedarrayoutofbounds" title="IsTypedArrayOutOfBounds ( taRecord )"><span class="secnum">10.4.5.14</span> IsTypedArrayOutOfBounds ( <var>taRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-istypedarrayfixedlength" title="IsTypedArrayFixedLength ( O )"><span class="secnum">10.4.5.15</span> IsTypedArrayFixedLength ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-isvalidintegerindex" title="IsValidIntegerIndex ( O, index )"><span class="secnum">10.4.5.16</span> IsValidIntegerIndex ( <var>O</var>, <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraygetelement" title="TypedArrayGetElement ( O, index )"><span class="secnum">10.4.5.17</span> TypedArrayGetElement ( <var>O</var>, <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraysetelement" title="TypedArraySetElement ( O, index, value )"><span class="secnum">10.4.5.18</span> TypedArraySetElement ( <var>O</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-isarraybufferviewoutofbounds" title="IsArrayBufferViewOutOfBounds ( O )"><span class="secnum">10.4.5.19</span> IsArrayBufferViewOutOfBounds ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects" title="Module Namespace Exotic Objects"><span class="secnum">10.4.6</span> Module Namespace Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-getprototypeof" title="[[GetPrototypeOf]] ( )"><span class="secnum">10.4.6.1</span> <var class="field">[[GetPrototypeOf]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-setprototypeof-v" title="[[SetPrototypeOf]] ( V )"><span class="secnum">10.4.6.2</span> <var class="field">[[SetPrototypeOf]]</var> ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-isextensible" title="[[IsExtensible]] ( )"><span class="secnum">10.4.6.3</span> <var class="field">[[IsExtensible]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-preventextensions" title="[[PreventExtensions]] ( )"><span class="secnum">10.4.6.4</span> <var class="field">[[PreventExtensions]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-getownproperty-p" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.4.6.5</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.4.6.6</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-hasproperty-p" title="[[HasProperty]] ( P )"><span class="secnum">10.4.6.7</span> <var class="field">[[HasProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-get-p-receiver" title="[[Get]] ( P, Receiver )"><span class="secnum">10.4.6.8</span> <var class="field">[[Get]]</var> ( <var>P</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-set-p-v-receiver" title="[[Set]] ( P, V, Receiver )"><span class="secnum">10.4.6.9</span> <var class="field">[[Set]]</var> ( <var>P</var>, <var>V</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-delete-p" title="[[Delete]] ( P )"><span class="secnum">10.4.6.10</span> <var class="field">[[Delete]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-module-namespace-exotic-objects-ownpropertykeys" title="[[OwnPropertyKeys]] ( )"><span class="secnum">10.4.6.11</span> <var class="field">[[OwnPropertyKeys]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-modulenamespacecreate" title="ModuleNamespaceCreate ( module, exports )"><span class="secnum">10.4.6.12</span> ModuleNamespaceCreate ( <var>module</var>, <var>exports</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-immutable-prototype-exotic-objects" title="Immutable Prototype Exotic Objects"><span class="secnum">10.4.7</span> Immutable Prototype Exotic Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-immutable-prototype-exotic-objects-setprototypeof-v" title="[[SetPrototypeOf]] ( V )"><span class="secnum">10.4.7.1</span> <var class="field">[[SetPrototypeOf]]</var> ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-set-immutable-prototype" title="SetImmutablePrototype ( O, V )"><span class="secnum">10.4.7.2</span> SetImmutablePrototype ( <var>O</var>, <var>V</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots" title="Proxy Object Internal Methods and Internal Slots"><span class="secnum">10.5</span> Proxy Object Internal Methods and Internal Slots</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-getprototypeof" title="[[GetPrototypeOf]] ( )"><span class="secnum">10.5.1</span> <var class="field">[[GetPrototypeOf]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-setprototypeof-v" title="[[SetPrototypeOf]] ( V )"><span class="secnum">10.5.2</span> <var class="field">[[SetPrototypeOf]]</var> ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-isextensible" title="[[IsExtensible]] ( )"><span class="secnum">10.5.3</span> <var class="field">[[IsExtensible]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-preventextensions" title="[[PreventExtensions]] ( )"><span class="secnum">10.5.4</span> <var class="field">[[PreventExtensions]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-getownproperty-p" title="[[GetOwnProperty]] ( P )"><span class="secnum">10.5.5</span> <var class="field">[[GetOwnProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc" title="[[DefineOwnProperty]] ( P, Desc )"><span class="secnum">10.5.6</span> <var class="field">[[DefineOwnProperty]]</var> ( <var>P</var>, <var>Desc</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p" title="[[HasProperty]] ( P )"><span class="secnum">10.5.7</span> <var class="field">[[HasProperty]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver" title="[[Get]] ( P, Receiver )"><span class="secnum">10.5.8</span> <var class="field">[[Get]]</var> ( <var>P</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver" title="[[Set]] ( P, V, Receiver )"><span class="secnum">10.5.9</span> <var class="field">[[Set]]</var> ( <var>P</var>, <var>V</var>, <var>Receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-delete-p" title="[[Delete]] ( P )"><span class="secnum">10.5.10</span> <var class="field">[[Delete]]</var> ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys" title="[[OwnPropertyKeys]] ( )"><span class="secnum">10.5.11</span> <var class="field">[[OwnPropertyKeys]]</var> ( )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-call-thisargument-argumentslist" title="[[Call]] ( thisArgument, argumentsList )"><span class="secnum">10.5.12</span> <var class="field">[[Call]]</var> ( <var>thisArgument</var>, <var>argumentsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget" title="[[Construct]] ( argumentsList, newTarget )"><span class="secnum">10.5.13</span> <var class="field">[[Construct]]</var> ( <var>argumentsList</var>, <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-validatenonrevokedproxy" title="ValidateNonRevokedProxy ( proxy )"><span class="secnum">10.5.14</span> ValidateNonRevokedProxy ( <var>proxy</var> )</a></li><li><span class="item-toggle-none"></span><a href="ordinary-and-exotic-objects-behaviours.html#sec-proxycreate" title="ProxyCreate ( target, handler )"><span class="secnum">10.5.15</span> ProxyCreate ( <var>target</var>, <var>handler</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-source-code.html#sec-ecmascript-language-source-code" title="ECMAScript Language: Source Text"><span class="secnum">11</span> ECMAScript Language: Source Text</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-source-code.html#sec-source-text" title="Source Text"><span class="secnum">11.1</span> Source Text</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-utf16encodecodepoint" title="Static Semantics: UTF16EncodeCodePoint ( cp )"><span class="secnum">11.1.1</span> SS: UTF16EncodeCodePoint ( <var>cp</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-codepointstostring" title="Static Semantics: CodePointsToString ( text )"><span class="secnum">11.1.2</span> SS: CodePointsToString ( <var>text</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-utf16decodesurrogatepair" title="Static Semantics: UTF16SurrogatePairToCodePoint ( lead, trail )"><span class="secnum">11.1.3</span> SS: UTF16SurrogatePairToCodePoint ( <var>lead</var>, <var>trail</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-codepointat" title="Static Semantics: CodePointAt ( string, position )"><span class="secnum">11.1.4</span> SS: CodePointAt ( <var>string</var>, <var>position</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-stringtocodepoints" title="Static Semantics: StringToCodePoints ( string )"><span class="secnum">11.1.5</span> SS: StringToCodePoints ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-parsetext" title="Static Semantics: ParseText ( sourceText, goalSymbol )"><span class="secnum">11.1.6</span> SS: ParseText ( <var>sourceText</var>, <var>goalSymbol</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-source-code.html#sec-types-of-source-code" title="Types of Source Code"><span class="secnum">11.2</span> Types of Source Code</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-directive-prologues-and-the-use-strict-directive" title="Directive Prologues and the Use Strict Directive"><span class="secnum">11.2.1</span> Directive Prologues and the Use Strict Directive</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-source-code.html#sec-strict-mode-code" title="Strict Mode Code"><span class="secnum">11.2.2</span> Strict Mode Code</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-isstrict" title="Static Semantics: IsStrict ( node )"><span class="secnum">11.2.2.1</span> SS: IsStrict ( <var>node</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-source-code.html#sec-non-ecmascript-functions" title="Non-ECMAScript Functions"><span class="secnum">11.2.3</span> Non-ECMAScript Functions</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-ecmascript-language-lexical-grammar" title="ECMAScript Language: Lexical Grammar"><span class="secnum">12</span> ECMAScript Language: Lexical Grammar</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-unicode-format-control-characters" title="Unicode Format-Control Characters"><span class="secnum">12.1</span> Unicode Format-Control Characters</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-white-space" title="White Space"><span class="secnum">12.2</span> White Space</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-line-terminators" title="Line Terminators"><span class="secnum">12.3</span> Line Terminators</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-comments" title="Comments"><span class="secnum">12.4</span> Comments</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-hashbang" title="Hashbang Comments"><span class="secnum">12.5</span> Hashbang Comments</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-tokens" title="Tokens"><span class="secnum">12.6</span> Tokens</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-names-and-keywords" title="Names and Keywords"><span class="secnum">12.7</span> Names and Keywords</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-identifier-names" title="Identifier Names"><span class="secnum">12.7.1</span> Identifier Names</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-identifier-names-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">12.7.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-identifiercodepoints" title="Static Semantics: IdentifierCodePoints"><span class="secnum">12.7.1.2</span> SS: IdentifierCodePoints</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-identifiercodepoint" title="Static Semantics: IdentifierCodePoint"><span class="secnum">12.7.1.3</span> SS: IdentifierCodePoint</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-keywords-and-reserved-words" title="Keywords and Reserved Words"><span class="secnum">12.7.2</span> Keywords and Reserved Words</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-punctuators" title="Punctuators"><span class="secnum">12.8</span> Punctuators</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-ecmascript-language-lexical-grammar-literals" title="Literals"><span class="secnum">12.9</span> Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-null-literals" title="Null Literals"><span class="secnum">12.9.1</span> Null Literals</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-boolean-literals" title="Boolean Literals"><span class="secnum">12.9.2</span> Boolean Literals</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-literals-numeric-literals" title="Numeric Literals"><span class="secnum">12.9.3</span> Numeric Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-numeric-literals-early-errors" title="Static Semantics: Early Errors"><span class="secnum">12.9.3.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-mv" title="Static Semantics: MV"><span class="secnum">12.9.3.2</span> SS: MV</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-numericvalue" title="Static Semantics: NumericValue"><span class="secnum">12.9.3.3</span> SS: NumericValue</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-literals-string-literals" title="String Literals"><span class="secnum">12.9.4</span> String Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-string-literals-early-errors" title="Static Semantics: Early Errors"><span class="secnum">12.9.4.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-sv" title="Static Semantics: SV"><span class="secnum">12.9.4.2</span> SS: SV</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-string-literals-static-semantics-mv" title="Static Semantics: MV"><span class="secnum">12.9.4.3</span> SS: MV</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-literals-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">12.9.5</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-bodytext" title="Static Semantics: BodyText"><span class="secnum">12.9.5.1</span> SS: BodyText</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-flagtext" title="Static Semantics: FlagText"><span class="secnum">12.9.5.2</span> SS: FlagText</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-template-literal-lexical-components" title="Template Literal Lexical Components"><span class="secnum">12.9.6</span> Template Literal Lexical Components</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-tv" title="Static Semantics: TV"><span class="secnum">12.9.6.1</span> SS: TV</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-static-semantics-trv" title="Static Semantics: TRV"><span class="secnum">12.9.6.2</span> SS: TRV</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-automatic-semicolon-insertion" title="Automatic Semicolon Insertion"><span class="secnum">12.10</span> Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-rules-of-automatic-semicolon-insertion" title="Rules of Automatic Semicolon Insertion"><span class="secnum">12.10.1</span> Rules of Automatic Semicolon Insertion</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-examples-of-automatic-semicolon-insertion" title="Examples of Automatic Semicolon Insertion"><span class="secnum">12.10.2</span> Examples of Automatic Semicolon Insertion</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-interesting-cases-of-automatic-semicolon-insertion" title="Interesting Cases of Automatic Semicolon Insertion"><span class="secnum">12.10.3</span> Interesting Cases of Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-asi-interesting-cases-in-statement-lists" title="Interesting Cases of Automatic Semicolon Insertion in Statement Lists"><span class="secnum">12.10.3.1</span> Interesting Cases of Automatic Semicolon Insertion in Statement Lists</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-lexical-grammar.html#sec-asi-cases-with-no-lineterminator-here" title="Cases of Automatic Semicolon Insertion and “[no LineTerminator here]”"><span class="secnum">12.10.3.2</span> Cases of Automatic Semicolon Insertion and “[no <emu-nt>LineTerminator</emu-nt> here]”</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-lexical-grammar.html#sec-no-lineterminator-here-automatic-semicolon-insertion-list" title="List of Grammar Productions with Optional Operands and “[no LineTerminator here]”"><span class="secnum">12.10.3.2.1</span> List of Grammar Productions with Optional Operands and “[no <emu-nt>LineTerminator</emu-nt> here]”</a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-identifiers" title="Identifiers"><span class="secnum">13.1</span> Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-identifiers-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-static-semantics-stringvalue" title="Static Semantics: StringValue"><span class="secnum">13.1.2</span> SS: StringValue</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-identifiers-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.1.3</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-primary-expression" title="Primary Expression"><span class="secnum">13.2</span> Primary Expression</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-this-keyword" title="The this Keyword"><span class="secnum">13.2.1</span> The <code>this</code> Keyword</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-this-keyword-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.1.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-identifier-reference" title="Identifier Reference"><span class="secnum">13.2.2</span> Identifier Reference</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-primary-expression-literals" title="Literals"><span class="secnum">13.2.3</span> Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-literals-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.3.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-array-initializer" title="Array Initializer"><span class="secnum">13.2.4</span> Array Initializer</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-arrayaccumulation" title="Runtime Semantics: ArrayAccumulation"><span class="secnum">13.2.4.1</span> RS: ArrayAccumulation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-array-initializer-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.4.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-object-initializer" title="Object Initializer"><span class="secnum">13.2.5</span> Object Initializer</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-object-initializer-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.5.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-static-semantics-iscomputedpropertykey" title="Static Semantics: IsComputedPropertyKey"><span class="secnum">13.2.5.2</span> SS: IsComputedPropertyKey</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-static-semantics-propertynamelist" title="Static Semantics: PropertyNameList"><span class="secnum">13.2.5.3</span> SS: PropertyNameList</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-object-initializer-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.5.4</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-propertydefinitionevaluation" title="Runtime Semantics: PropertyDefinitionEvaluation"><span class="secnum">13.2.5.5</span> RS: PropertyDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-function-defining-expressions" title="Function Defining Expressions"><span class="secnum">13.2.6</span> Function Defining Expressions</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-primary-expression-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">13.2.7</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-primary-expression-regular-expression-literals-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-isvalidregularexpressionliteral" title="Static Semantics: IsValidRegularExpressionLiteral ( literal )"><span class="secnum">13.2.7.2</span> SS: IsValidRegularExpressionLiteral ( <var>literal</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-regular-expression-literals-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.7.3</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-template-literals" title="Template Literals"><span class="secnum">13.2.8</span> Template Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-static-semantics-template-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.8.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-static-semantics-templatestrings" title="Static Semantics: TemplateStrings"><span class="secnum">13.2.8.2</span> SS: TemplateStrings</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-templatestring" title="Static Semantics: TemplateString ( templateToken, raw )"><span class="secnum">13.2.8.3</span> SS: TemplateString ( <var>templateToken</var>, <var>raw</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-gettemplateobject" title="GetTemplateObject ( templateLiteral )"><span class="secnum">13.2.8.4</span> GetTemplateObject ( <var>templateLiteral</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-substitutionevaluation" title="Runtime Semantics: SubstitutionEvaluation"><span class="secnum">13.2.8.5</span> RS: SubstitutionEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-template-literals-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.8.6</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-grouping-operator" title="The Grouping Operator"><span class="secnum">13.2.9</span> The Grouping Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-grouping-operator-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.9.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-grouping-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.2.9.2</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-left-hand-side-expressions" title="Left-Hand-Side Expressions"><span class="secnum">13.3</span> Left-Hand-Side Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-static-semantics" title="Static Semantics"><span class="secnum">13.3.1</span> Static Semantics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-left-hand-side-expressions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.3.1.1</span> SS: Early Errors</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-property-accessors" title="Property Accessors"><span class="secnum">13.3.2</span> Property Accessors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-property-accessors-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.2.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluate-property-access-with-expression-key" title="EvaluatePropertyAccessWithExpressionKey ( baseValue, expression, strict )"><span class="secnum">13.3.3</span> EvaluatePropertyAccessWithExpressionKey ( <var>baseValue</var>, <var>expression</var>, <var>strict</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluate-property-access-with-identifier-key" title="EvaluatePropertyAccessWithIdentifierKey ( baseValue, identifierName, strict )"><span class="secnum">13.3.4</span> EvaluatePropertyAccessWithIdentifierKey ( <var>baseValue</var>, <var>identifierName</var>, <var>strict</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-new-operator" title="The new Operator"><span class="secnum">13.3.5</span> The <code>new</code> Operator</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-new-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.5.1</span> RS: Evaluation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluatenew" title="EvaluateNew ( constructExpr, arguments )"><span class="secnum">13.3.5.1.1</span> EvaluateNew ( <var>constructExpr</var>, <var>arguments</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-function-calls" title="Function Calls"><span class="secnum">13.3.6</span> Function Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-function-calls-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.6.1</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluatecall" title="EvaluateCall ( func, ref, arguments, tailPosition )"><span class="secnum">13.3.6.2</span> EvaluateCall ( <var>func</var>, <var>ref</var>, <var>arguments</var>, <var>tailPosition</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-super-keyword" title="The super Keyword"><span class="secnum">13.3.7</span> The <code>super</code> Keyword</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-super-keyword-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.7.1</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-getsuperconstructor" title="GetSuperConstructor ( )"><span class="secnum">13.3.7.2</span> GetSuperConstructor ( )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-makesuperpropertyreference" title="MakeSuperPropertyReference ( actualThis, propertyKey, strict )"><span class="secnum">13.3.7.3</span> MakeSuperPropertyReference ( <var>actualThis</var>, <var>propertyKey</var>, <var>strict</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-argument-lists" title="Argument Lists"><span class="secnum">13.3.8</span> Argument Lists</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-argumentlistevaluation" title="Runtime Semantics: ArgumentListEvaluation"><span class="secnum">13.3.8.1</span> RS: ArgumentListEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-optional-chains" title="Optional Chains"><span class="secnum">13.3.9</span> Optional Chains</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-optional-chaining-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.9.1</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-optional-chaining-chain-evaluation" title="Runtime Semantics: ChainEvaluation"><span class="secnum">13.3.9.2</span> RS: ChainEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-import-calls" title="Import Calls"><span class="secnum">13.3.10</span> Import Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-import-call-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.10.1</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluate-import-call" title="EvaluateImportCall ( specifierExpression [ , optionsExpression ] )"><span class="secnum">13.3.10.2</span> EvaluateImportCall ( <var>specifierExpression</var> [ , <var>optionsExpression</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-ContinueDynamicImport" title="ContinueDynamicImport ( promiseCapability, moduleCompletion )"><span class="secnum">13.3.10.3</span> ContinueDynamicImport ( <var>promiseCapability</var>, <var>moduleCompletion</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-tagged-templates" title="Tagged Templates"><span class="secnum">13.3.11</span> Tagged Templates</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-tagged-templates-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.11.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-meta-properties" title="Meta Properties"><span class="secnum">13.3.12</span> Meta Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-meta-properties-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.3.12.1</span> RS: Evaluation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-hostgetimportmetaproperties" title="HostGetImportMetaProperties ( moduleRecord )"><span class="secnum">13.3.12.1.1</span> HostGetImportMetaProperties ( <var>moduleRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-hostfinalizeimportmeta" title="HostFinalizeImportMeta ( importMeta, moduleRecord )"><span class="secnum">13.3.12.1.2</span> HostFinalizeImportMeta ( <var>importMeta</var>, <var>moduleRecord</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-update-expressions" title="Update Expressions"><span class="secnum">13.4</span> Update Expressions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-update-expressions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.4.1</span> SS: Early Errors</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-postfix-increment-operator" title="Postfix Increment Operator"><span class="secnum">13.4.2</span> Postfix Increment Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-postfix-increment-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.4.2.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-postfix-decrement-operator" title="Postfix Decrement Operator"><span class="secnum">13.4.3</span> Postfix Decrement Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-postfix-decrement-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.4.3.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-prefix-increment-operator" title="Prefix Increment Operator"><span class="secnum">13.4.4</span> Prefix Increment Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-prefix-increment-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.4.4.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-prefix-decrement-operator" title="Prefix Decrement Operator"><span class="secnum">13.4.5</span> Prefix Decrement Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-prefix-decrement-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.4.5.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-unary-operators" title="Unary Operators"><span class="secnum">13.5</span> Unary Operators</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-delete-operator" title="The delete Operator"><span class="secnum">13.5.1</span> The <code>delete</code> Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-delete-operator-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.5.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-delete-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.1.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-void-operator" title="The void Operator"><span class="secnum">13.5.2</span> The <code>void</code> Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-void-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.2.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-typeof-operator" title="The typeof Operator"><span class="secnum">13.5.3</span> The <code>typeof</code> Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-typeof-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.3.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-unary-plus-operator" title="Unary + Operator"><span class="secnum">13.5.4</span> Unary <code>+</code> Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-unary-plus-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.4.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-unary-minus-operator" title="Unary - Operator"><span class="secnum">13.5.5</span> Unary <code>-</code> Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-unary-minus-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.5.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-bitwise-not-operator" title="Bitwise NOT Operator ( ~ )"><span class="secnum">13.5.6</span> Bitwise NOT Operator ( <code>~</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-bitwise-not-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.6.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-logical-not-operator" title="Logical NOT Operator ( ! )"><span class="secnum">13.5.7</span> Logical NOT Operator ( <code>!</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-logical-not-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.7.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-exp-operator" title="Exponentiation Operator"><span class="secnum">13.6</span> Exponentiation Operator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-exp-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.6.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-multiplicative-operators" title="Multiplicative Operators"><span class="secnum">13.7</span> Multiplicative Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-multiplicative-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.7.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-additive-operators" title="Additive Operators"><span class="secnum">13.8</span> Additive Operators</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-addition-operator-plus" title="The Addition Operator ( + )"><span class="secnum">13.8.1</span> The Addition Operator ( <code>+</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-addition-operator-plus-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.8.1.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-subtraction-operator-minus" title="The Subtraction Operator ( - )"><span class="secnum">13.8.2</span> The Subtraction Operator ( <code>-</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-subtraction-operator-minus-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.8.2.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-bitwise-shift-operators" title="Bitwise Shift Operators"><span class="secnum">13.9</span> Bitwise Shift Operators</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-left-shift-operator" title="The Left Shift Operator ( << )"><span class="secnum">13.9.1</span> The Left Shift Operator ( <code>&lt;&lt;</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-left-shift-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.9.1.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-signed-right-shift-operator" title="The Signed Right Shift Operator ( >> )"><span class="secnum">13.9.2</span> The Signed Right Shift Operator ( <code>&gt;&gt;</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-signed-right-shift-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.9.2.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-unsigned-right-shift-operator" title="The Unsigned Right Shift Operator ( >>> )"><span class="secnum">13.9.3</span> The Unsigned Right Shift Operator ( <code>&gt;&gt;&gt;</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-unsigned-right-shift-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.9.3.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-instanceofoperator" title="InstanceofOperator ( V, target )"><span class="secnum">13.10.2</span> InstanceofOperator ( <var>V</var>, <var>target</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-equality-operators" title="Equality Operators"><span class="secnum">13.11</span> Equality Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-equality-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.11.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-binary-bitwise-operators" title="Binary Bitwise Operators"><span class="secnum">13.12</span> Binary Bitwise Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-binary-bitwise-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.12.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-binary-logical-operators" title="Binary Logical Operators"><span class="secnum">13.13</span> Binary Logical Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-binary-logical-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.13.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-conditional-operator" title="Conditional Operator ( ? : )"><span class="secnum">13.14</span> Conditional Operator ( <code>? :</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-conditional-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.14.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-assignment-operators" title="Assignment Operators"><span class="secnum">13.15</span> Assignment Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-assignment-operators-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.15.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-assignment-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.15.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-applystringornumericbinaryoperator" title="ApplyStringOrNumericBinaryOperator ( lVal, opText, rVal )"><span class="secnum">13.15.3</span> ApplyStringOrNumericBinaryOperator ( <var>lVal</var>, <var>opText</var>, <var>rVal</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-evaluatestringornumericbinaryexpression" title="EvaluateStringOrNumericBinaryExpression ( leftOperand, opText, rightOperand )"><span class="secnum">13.15.4</span> EvaluateStringOrNumericBinaryExpression ( <var>leftOperand</var>, <var>opText</var>, <var>rightOperand</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-destructuring-assignment" title="Destructuring Assignment"><span class="secnum">13.15.5</span> Destructuring Assignment</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-destructuring-assignment-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.15.5.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-destructuringassignmentevaluation" title="Runtime Semantics: DestructuringAssignmentEvaluation"><span class="secnum">13.15.5.2</span> RS: DestructuringAssignmentEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-propertydestructuringassignmentevaluation" title="Runtime Semantics: PropertyDestructuringAssignmentEvaluation"><span class="secnum">13.15.5.3</span> RS: PropertyDestructuringAssignmentEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-restdestructuringassignmentevaluation" title="Runtime Semantics: RestDestructuringAssignmentEvaluation"><span class="secnum">13.15.5.4</span> RS: RestDestructuringAssignmentEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-iteratordestructuringassignmentevaluation" title="Runtime Semantics: IteratorDestructuringAssignmentEvaluation"><span class="secnum">13.15.5.5</span> RS: IteratorDestructuringAssignmentEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-runtime-semantics-keyeddestructuringassignmentevaluation" title="Runtime Semantics: KeyedDestructuringAssignmentEvaluation"><span class="secnum">13.15.5.6</span> RS: KeyedDestructuringAssignmentEvaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-expressions.html#sec-comma-operator" title="Comma Operator ( , )"><span class="secnum">13.16</span> Comma Operator ( <code>,</code> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-expressions.html#sec-comma-operator-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.16.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-ecmascript-language-statements-and-declarations" title="ECMAScript Language: Statements and Declarations"><span class="secnum">14</span> ECMAScript Language: Statements and Declarations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-statement-semantics" title="Statement Semantics"><span class="secnum">14.1</span> Statement Semantics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-statement-semantics-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.1.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-block" title="Block"><span class="secnum">14.2</span> Block</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-block-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-block-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.2.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-blockdeclarationinstantiation" title="BlockDeclarationInstantiation ( code, env )"><span class="secnum">14.2.3</span> BlockDeclarationInstantiation ( <var>code</var>, <var>env</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-declarations-and-the-variable-statement" title="Declarations and the Variable Statement"><span class="secnum">14.3</span> Declarations and the Variable Statement</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations" title="Let and Const Declarations"><span class="secnum">14.3.1</span> Let and Const Declarations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.3.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.3.1.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-variable-statement" title="Variable Statement"><span class="secnum">14.3.2</span> Variable Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-variable-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.3.2.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-destructuring-binding-patterns" title="Destructuring Binding Patterns"><span class="secnum">14.3.3</span> Destructuring Binding Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-destructuring-binding-patterns-runtime-semantics-propertybindinginitialization" title="Runtime Semantics: PropertyBindingInitialization"><span class="secnum">14.3.3.1</span> RS: PropertyBindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-destructuring-binding-patterns-runtime-semantics-restbindinginitialization" title="Runtime Semantics: RestBindingInitialization"><span class="secnum">14.3.3.2</span> RS: RestBindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-keyedbindinginitialization" title="Runtime Semantics: KeyedBindingInitialization"><span class="secnum">14.3.3.3</span> RS: KeyedBindingInitialization</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-empty-statement" title="Empty Statement"><span class="secnum">14.4</span> Empty Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-empty-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.4.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-expression-statement" title="Expression Statement"><span class="secnum">14.5</span> Expression Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-expression-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.5.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-if-statement" title="The if Statement"><span class="secnum">14.6</span> The <code>if</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-if-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.6.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-if-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.6.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-iteration-statements" title="Iteration Statements"><span class="secnum">14.7</span> Iteration Statements</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-iteration-statements-semantics" title="Semantics"><span class="secnum">14.7.1</span> Semantics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-loopcontinues" title="LoopContinues ( completion, labelSet )"><span class="secnum">14.7.1.1</span> LoopContinues ( <var>completion</var>, <var>labelSet</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-loopevaluation" title="Runtime Semantics: LoopEvaluation"><span class="secnum">14.7.1.2</span> RS: LoopEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-do-while-statement" title="The do-while Statement"><span class="secnum">14.7.2</span> The <code>do</code>-<code>while</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-do-while-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.7.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-dowhileloopevaluation" title="Runtime Semantics: DoWhileLoopEvaluation"><span class="secnum">14.7.2.2</span> RS: DoWhileLoopEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-while-statement" title="The while Statement"><span class="secnum">14.7.3</span> The <code>while</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-while-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.7.3.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-whileloopevaluation" title="Runtime Semantics: WhileLoopEvaluation"><span class="secnum">14.7.3.2</span> RS: WhileLoopEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-for-statement" title="The for Statement"><span class="secnum">14.7.4</span> The <code>for</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-for-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.7.4.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-forloopevaluation" title="Runtime Semantics: ForLoopEvaluation"><span class="secnum">14.7.4.2</span> RS: ForLoopEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-forbodyevaluation" title="ForBodyEvaluation ( test, increment, stmt, perIterationBindings, labelSet )"><span class="secnum">14.7.4.3</span> ForBodyEvaluation ( <var>test</var>, <var>increment</var>, <var>stmt</var>, <var>perIterationBindings</var>, <var>labelSet</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-createperiterationenvironment" title="CreatePerIterationEnvironment ( perIterationBindings )"><span class="secnum">14.7.4.4</span> CreatePerIterationEnvironment ( <var>perIterationBindings</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements" title="The for-in, for-of, and for-await-of Statements"><span class="secnum">14.7.5</span> The <code>for</code>-<code>in</code>, <code>for</code>-<code>of</code>, and <code>for</code>-<code>await</code>-<code>of</code> Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.7.5.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-static-semantics-isdestructuring" title="Static Semantics: IsDestructuring"><span class="secnum">14.7.5.2</span> SS: IsDestructuring</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-fordeclarationbindinginitialization" title="Runtime Semantics: ForDeclarationBindingInitialization"><span class="secnum">14.7.5.3</span> RS: ForDeclarationBindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-fordeclarationbindinginstantiation" title="Runtime Semantics: ForDeclarationBindingInstantiation"><span class="secnum">14.7.5.4</span> RS: ForDeclarationBindingInstantiation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-forinofloopevaluation" title="Runtime Semantics: ForInOfLoopEvaluation"><span class="secnum">14.7.5.5</span> RS: ForInOfLoopEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-forinofheadevaluation" title="ForIn/OfHeadEvaluation ( uninitializedBoundNames, expr, iterationKind )"><span class="secnum">14.7.5.6</span> ForIn/OfHeadEvaluation ( <var>uninitializedBoundNames</var>, <var>expr</var>, <var>iterationKind</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-forin-div-ofbodyevaluation-lhs-stmt-iterator-lhskind-labelset" title="ForIn/OfBodyEvaluation ( lhs, stmt, iteratorRecord, iterationKind, lhsKind, labelSet [ , iteratorKind ] )"><span class="secnum">14.7.5.7</span> ForIn/OfBodyEvaluation ( <var>lhs</var>, <var>stmt</var>, <var>iteratorRecord</var>, <var>iterationKind</var>, <var>lhsKind</var>, <var>labelSet</var> [ , <var>iteratorKind</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.7.5.8</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-enumerate-object-properties" title="EnumerateObjectProperties ( O )"><span class="secnum">14.7.5.9</span> EnumerateObjectProperties ( <var>O</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-for-in-iterator-objects" title="For-In Iterator Objects"><span class="secnum">14.7.5.10</span> For-In Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-createforiniterator" title="CreateForInIterator ( object )"><span class="secnum">14.7.5.10.1</span> CreateForInIterator ( <var>object</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-%foriniteratorprototype%-object" title="The %ForInIteratorPrototype% Object"><span class="secnum">14.7.5.10.2</span> The %ForInIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-%foriniteratorprototype%.next" title="%ForInIteratorPrototype%.next ( )"><span class="secnum">14.7.5.10.2.1</span> %ForInIteratorPrototype%.next ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-properties-of-for-in-iterator-instances" title="Properties of For-In Iterator Instances"><span class="secnum">14.7.5.10.3</span> Properties of For-In Iterator Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-continue-statement" title="The continue Statement"><span class="secnum">14.8</span> The <code>continue</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-continue-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.8.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-continue-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.8.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-break-statement" title="The break Statement"><span class="secnum">14.9</span> The <code>break</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-break-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.9.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-break-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.9.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-return-statement" title="The return Statement"><span class="secnum">14.10</span> The <code>return</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-return-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.10.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-with-statement" title="The with Statement"><span class="secnum">14.11</span> The <code>with</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-with-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.11.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-with-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.11.2</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-switch-statement" title="The switch Statement"><span class="secnum">14.12</span> The <code>switch</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-switch-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.12.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-caseblockevaluation" title="Runtime Semantics: CaseBlockEvaluation"><span class="secnum">14.12.2</span> RS: CaseBlockEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-caseclauseisselected" title="CaseClauseIsSelected ( C, input )"><span class="secnum">14.12.3</span> CaseClauseIsSelected ( <var>C</var>, <var>input</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-switch-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.12.4</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-labelled-statements" title="Labelled Statements"><span class="secnum">14.13</span> Labelled Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-labelled-statements-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.13.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-islabelledfunction" title="Static Semantics: IsLabelledFunction ( stmt )"><span class="secnum">14.13.2</span> SS: IsLabelledFunction ( <var>stmt</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-labelled-statements-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.13.3</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-labelledevaluation" title="Runtime Semantics: LabelledEvaluation"><span class="secnum">14.13.4</span> RS: LabelledEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-throw-statement" title="The throw Statement"><span class="secnum">14.14</span> The <code>throw</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-throw-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.14.1</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-try-statement" title="The try Statement"><span class="secnum">14.15</span> The <code>try</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-try-statement-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">14.15.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-runtime-semantics-catchclauseevaluation" title="Runtime Semantics: CatchClauseEvaluation"><span class="secnum">14.15.2</span> RS: CatchClauseEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-try-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.15.3</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-statements-and-declarations.html#sec-debugger-statement" title="The debugger Statement"><span class="secnum">14.16</span> The <code>debugger</code> Statement</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-statements-and-declarations.html#sec-debugger-statement-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">14.16.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-ecmascript-language-functions-and-classes" title="ECMAScript Language: Functions and Classes"><span class="secnum">15</span> ECMAScript Language: Functions and Classes</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-parameter-lists" title="Parameter Lists"><span class="secnum">15.1</span> Parameter Lists</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-parameter-lists-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-containsexpression" title="Static Semantics: ContainsExpression"><span class="secnum">15.1.2</span> SS: ContainsExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-issimpleparameterlist" title="Static Semantics: IsSimpleParameterList"><span class="secnum">15.1.3</span> SS: IsSimpleParameterList</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-hasinitializer" title="Static Semantics: HasInitializer"><span class="secnum">15.1.4</span> SS: HasInitializer</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-expectedargumentcount" title="Static Semantics: ExpectedArgumentCount"><span class="secnum">15.1.5</span> SS: ExpectedArgumentCount</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-function-definitions" title="Function Definitions"><span class="secnum">15.2</span> Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-functionbodycontainsusestrict" title="Static Semantics: FunctionBodyContainsUseStrict"><span class="secnum">15.2.2</span> SS: FunctionBodyContainsUseStrict</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluatefunctionbody" title="Runtime Semantics: EvaluateFunctionBody"><span class="secnum">15.2.3</span> RS: EvaluateFunctionBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateordinaryfunctionobject" title="Runtime Semantics: InstantiateOrdinaryFunctionObject"><span class="secnum">15.2.4</span> RS: InstantiateOrdinaryFunctionObject</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateordinaryfunctionexpression" title="Runtime Semantics: InstantiateOrdinaryFunctionExpression"><span class="secnum">15.2.5</span> RS: InstantiateOrdinaryFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-function-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.2.6</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-arrow-function-definitions" title="Arrow Function Definitions"><span class="secnum">15.3</span> Arrow Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-arrow-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.3.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-concisebodycontainsusestrict" title="Static Semantics: ConciseBodyContainsUseStrict"><span class="secnum">15.3.2</span> SS: ConciseBodyContainsUseStrict</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluateconcisebody" title="Runtime Semantics: EvaluateConciseBody"><span class="secnum">15.3.3</span> RS: EvaluateConciseBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiatearrowfunctionexpression" title="Runtime Semantics: InstantiateArrowFunctionExpression"><span class="secnum">15.3.4</span> RS: InstantiateArrowFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-arrow-function-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.3.5</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-method-definitions" title="Method Definitions"><span class="secnum">15.4</span> Method Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-method-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.4.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-hasdirectsuper" title="Static Semantics: HasDirectSuper"><span class="secnum">15.4.2</span> SS: HasDirectSuper</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-specialmethod" title="Static Semantics: SpecialMethod"><span class="secnum">15.4.3</span> SS: SpecialMethod</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-definemethod" title="Runtime Semantics: DefineMethod"><span class="secnum">15.4.4</span> RS: DefineMethod</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-methoddefinitionevaluation" title="Runtime Semantics: MethodDefinitionEvaluation"><span class="secnum">15.4.5</span> RS: MethodDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-generator-function-definitions" title="Generator Function Definitions"><span class="secnum">15.5</span> Generator Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-generator-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.5.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluategeneratorbody" title="Runtime Semantics: EvaluateGeneratorBody"><span class="secnum">15.5.2</span> RS: EvaluateGeneratorBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiategeneratorfunctionobject" title="Runtime Semantics: InstantiateGeneratorFunctionObject"><span class="secnum">15.5.3</span> RS: InstantiateGeneratorFunctionObject</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiategeneratorfunctionexpression" title="Runtime Semantics: InstantiateGeneratorFunctionExpression"><span class="secnum">15.5.4</span> RS: InstantiateGeneratorFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-generator-function-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.5.5</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-async-generator-function-definitions" title="Async Generator Function Definitions"><span class="secnum">15.6</span> Async Generator Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-async-generator-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.6.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluateasyncgeneratorbody" title="Runtime Semantics: EvaluateAsyncGeneratorBody"><span class="secnum">15.6.2</span> RS: EvaluateAsyncGeneratorBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateasyncgeneratorfunctionobject" title="Runtime Semantics: InstantiateAsyncGeneratorFunctionObject"><span class="secnum">15.6.3</span> RS: InstantiateAsyncGeneratorFunctionObject</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateasyncgeneratorfunctionexpression" title="Runtime Semantics: InstantiateAsyncGeneratorFunctionExpression"><span class="secnum">15.6.4</span> RS: InstantiateAsyncGeneratorFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-asyncgenerator-definitions-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.6.5</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-class-definitions" title="Class Definitions"><span class="secnum">15.7</span> Class Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-class-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-classelementkind" title="Static Semantics: ClassElementKind"><span class="secnum">15.7.2</span> SS: ClassElementKind</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-constructormethod" title="Static Semantics: ConstructorMethod"><span class="secnum">15.7.3</span> SS: ConstructorMethod</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-isstatic" title="Static Semantics: IsStatic"><span class="secnum">15.7.4</span> SS: IsStatic</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-nonconstructorelements" title="Static Semantics: NonConstructorElements"><span class="secnum">15.7.5</span> SS: NonConstructorElements</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-prototypepropertynamelist" title="Static Semantics: PrototypePropertyNameList"><span class="secnum">15.7.6</span> SS: PrototypePropertyNameList</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-allprivateidentifiersvalid" title="Static Semantics: AllPrivateIdentifiersValid"><span class="secnum">15.7.7</span> SS: AllPrivateIdentifiersValid</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-privateboundidentifiers" title="Static Semantics: PrivateBoundIdentifiers"><span class="secnum">15.7.8</span> SS: PrivateBoundIdentifiers</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-containsarguments" title="Static Semantics: ContainsArguments"><span class="secnum">15.7.9</span> SS: ContainsArguments</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-classfielddefinitionevaluation" title="Runtime Semantics: ClassFieldDefinitionEvaluation"><span class="secnum">15.7.10</span> RS: ClassFieldDefinitionEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-classstaticblockdefinitionevaluation" title="Runtime Semantics: ClassStaticBlockDefinitionEvaluation"><span class="secnum">15.7.11</span> RS: ClassStaticBlockDefinitionEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluateclassstaticblockbody" title="Runtime Semantics: EvaluateClassStaticBlockBody"><span class="secnum">15.7.12</span> RS: EvaluateClassStaticBlockBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-classelementevaluation" title="Runtime Semantics: ClassElementEvaluation"><span class="secnum">15.7.13</span> RS: ClassElementEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-classdefinitionevaluation" title="Runtime Semantics: ClassDefinitionEvaluation"><span class="secnum">15.7.14</span> RS: ClassDefinitionEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-bindingclassdeclarationevaluation" title="Runtime Semantics: BindingClassDeclarationEvaluation"><span class="secnum">15.7.15</span> RS: BindingClassDeclarationEvaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-class-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.7.16</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-async-function-definitions" title="Async Function Definitions"><span class="secnum">15.8</span> Async Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-async-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.8.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateasyncfunctionobject" title="Runtime Semantics: InstantiateAsyncFunctionObject"><span class="secnum">15.8.2</span> RS: InstantiateAsyncFunctionObject</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateasyncfunctionexpression" title="Runtime Semantics: InstantiateAsyncFunctionExpression"><span class="secnum">15.8.3</span> RS: InstantiateAsyncFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluateasyncfunctionbody" title="Runtime Semantics: EvaluateAsyncFunctionBody"><span class="secnum">15.8.4</span> RS: EvaluateAsyncFunctionBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-async-function-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.8.5</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-async-arrow-function-definitions" title="Async Arrow Function Definitions"><span class="secnum">15.9</span> Async Arrow Function Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-async-arrow-function-definitions-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">15.9.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-asyncconcisebodycontainsusestrict" title="Static Semantics: AsyncConciseBodyContainsUseStrict"><span class="secnum">15.9.2</span> SS: AsyncConciseBodyContainsUseStrict</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-evaluateasyncconcisebody" title="Runtime Semantics: EvaluateAsyncConciseBody"><span class="secnum">15.9.3</span> RS: EvaluateAsyncConciseBody</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-runtime-semantics-instantiateasyncarrowfunctionexpression" title="Runtime Semantics: InstantiateAsyncArrowFunctionExpression"><span class="secnum">15.9.4</span> RS: InstantiateAsyncArrowFunctionExpression</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-async-arrow-function-definitions-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">15.9.5</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-functions-and-classes.html#sec-tail-position-calls" title="Tail Position Calls"><span class="secnum">15.10</span> Tail Position Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-isintailposition" title="Static Semantics: IsInTailPosition ( call )"><span class="secnum">15.10.1</span> SS: IsInTailPosition ( <var>call</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-static-semantics-hascallintailposition" title="Static Semantics: HasCallInTailPosition"><span class="secnum">15.10.2</span> SS: HasCallInTailPosition</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-functions-and-classes.html#sec-preparefortailcall" title="PrepareForTailCall ( )"><span class="secnum">15.10.3</span> PrepareForTailCall ( )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-ecmascript-language-scripts-and-modules" title="ECMAScript Language: Scripts and Modules"><span class="secnum">16</span> ECMAScript Language: Scripts and Modules</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-scripts" title="Scripts"><span class="secnum">16.1</span> Scripts</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-scripts-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">16.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-scriptisstrict" title="Static Semantics: ScriptIsStrict"><span class="secnum">16.1.2</span> SS: ScriptIsStrict</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-script-semantics-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">16.1.3</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-script-records" title="Script Records"><span class="secnum">16.1.4</span> Script Records</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-parse-script" title="ParseScript ( sourceText, realm, hostDefined )"><span class="secnum">16.1.5</span> ParseScript ( <var>sourceText</var>, <var>realm</var>, <var>hostDefined</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-runtime-semantics-scriptevaluation" title="ScriptEvaluation ( scriptRecord )"><span class="secnum">16.1.6</span> ScriptEvaluation ( <var>scriptRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-globaldeclarationinstantiation" title="GlobalDeclarationInstantiation ( script, env )"><span class="secnum">16.1.7</span> GlobalDeclarationInstantiation ( <var>script</var>, <var>env</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-modules" title="Modules"><span class="secnum">16.2</span> Modules</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-module-semantics" title="Module Semantics"><span class="secnum">16.2.1</span> Module Semantics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-module-semantics-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">16.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-importedlocalnames" title="Static Semantics: ImportedLocalNames ( importEntries )"><span class="secnum">16.2.1.2</span> SS: ImportedLocalNames ( <var>importEntries</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-modulerequest-record" title="ModuleRequest Records"><span class="secnum">16.2.1.3</span> ModuleRequest Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-ModuleRequestsEqual" title="ModuleRequestsEqual ( left, right )"><span class="secnum">16.2.1.3.1</span> ModuleRequestsEqual ( <var>left</var>, <var>right</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-modulerequests" title="Static Semantics: ModuleRequests"><span class="secnum">16.2.1.4</span> SS: ModuleRequests</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-abstract-module-records" title="Abstract Module Records"><span class="secnum">16.2.1.5</span> Abstract Module Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-EvaluateModuleSync" title="EvaluateModuleSync ( module )"><span class="secnum">16.2.1.5.1</span> EvaluateModuleSync ( <var>module</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-cyclic-module-records" title="Cyclic Module Records"><span class="secnum">16.2.1.6</span> Cyclic Module Records</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-cyclic-module-record-module-record-methods" title="Implementation of Module Record Abstract Methods"><span class="secnum">16.2.1.6.1</span> Implementation of Module Record Abstract Methods</a><ol class="toc"><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-LoadRequestedModules" title="LoadRequestedModules ( [ hostDefined ] )"><span class="secnum">16.2.1.6.1.1</span> LoadRequestedModules ( [ <var>hostDefined</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-InnerModuleLoading" title="InnerModuleLoading ( state, module )"><span class="secnum">16.2.1.6.1.1.1</span> InnerModuleLoading ( <var>state</var>, <var>module</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-ContinueModuleLoading" title="ContinueModuleLoading ( state, moduleCompletion )"><span class="secnum">16.2.1.6.1.1.2</span> ContinueModuleLoading ( <var>state</var>, <var>moduleCompletion</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-moduledeclarationlinking" title="Link ( )"><span class="secnum">16.2.1.6.1.2</span> Link ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-InnerModuleLinking" title="InnerModuleLinking ( module, stack, index )"><span class="secnum">16.2.1.6.1.2.1</span> InnerModuleLinking ( <var>module</var>, <var>stack</var>, <var>index</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-moduleevaluation" title="Evaluate ( )"><span class="secnum">16.2.1.6.1.3</span> Evaluate ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-innermoduleevaluation" title="InnerModuleEvaluation ( module, stack, index )"><span class="secnum">16.2.1.6.1.3.1</span> InnerModuleEvaluation ( <var>module</var>, <var>stack</var>, <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-execute-async-module" title="ExecuteAsyncModule ( module )"><span class="secnum">16.2.1.6.1.3.2</span> ExecuteAsyncModule ( <var>module</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-gather-available-ancestors" title="GatherAvailableAncestors ( module, execList )"><span class="secnum">16.2.1.6.1.3.3</span> GatherAvailableAncestors ( <var>module</var>, <var>execList</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-async-module-execution-fulfilled" title="AsyncModuleExecutionFulfilled ( module )"><span class="secnum">16.2.1.6.1.3.4</span> AsyncModuleExecutionFulfilled ( <var>module</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-async-module-execution-rejected" title="AsyncModuleExecutionRejected ( module, error )"><span class="secnum">16.2.1.6.1.3.5</span> AsyncModuleExecutionRejected ( <var>module</var>, <var>error</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-example-cyclic-module-record-graphs" title="Example Cyclic Module Record Graphs"><span class="secnum">16.2.1.6.2</span> Example Cyclic Module Record Graphs</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-source-text-module-records" title="Source Text Module Records"><span class="secnum">16.2.1.7</span> Source Text Module Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-parsemodule" title="ParseModule ( sourceText, realm, hostDefined )"><span class="secnum">16.2.1.7.1</span> ParseModule ( <var>sourceText</var>, <var>realm</var>, <var>hostDefined</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-source-text-module-record-module-record-methods" title="Implementation of Module Record Abstract Methods"><span class="secnum">16.2.1.7.2</span> Implementation of Module Record Abstract Methods</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-getexportednames" title="GetExportedNames ( [ exportStarSet ] )"><span class="secnum">16.2.1.7.2.1</span> GetExportedNames ( [ <var>exportStarSet</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-resolveexport" title="ResolveExport ( exportName [ , resolveSet ] )"><span class="secnum">16.2.1.7.2.2</span> ResolveExport ( <var>exportName</var> [ , <var>resolveSet</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-source-text-module-record-cyclic-module-record-methods" title="Implementation of Cyclic Module Record Abstract Methods"><span class="secnum">16.2.1.7.3</span> Implementation of Cyclic Module Record Abstract Methods</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-source-text-module-record-initialize-environment" title="InitializeEnvironment ( )"><span class="secnum">16.2.1.7.3.1</span> InitializeEnvironment ( )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-source-text-module-record-execute-module" title="ExecuteModule ( [ capability ] )"><span class="secnum">16.2.1.7.3.2</span> ExecuteModule ( [ <var>capability</var> ] )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-synthetic-module-records" title="Synthetic Module Records"><span class="secnum">16.2.1.8</span> Synthetic Module Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-create-default-export-synthetic-module" title="CreateDefaultExportSyntheticModule ( defaultExport )"><span class="secnum">16.2.1.8.1</span> CreateDefaultExportSyntheticModule ( <var>defaultExport</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-parse-json-module" title="ParseJSONModule ( source )"><span class="secnum">16.2.1.8.2</span> ParseJSONModule ( <var>source</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-setsyntheticmoduleexport" title="SetSyntheticModuleExport ( module, exportName, exportValue )"><span class="secnum">16.2.1.8.3</span> SetSyntheticModuleExport ( <var>module</var>, <var>exportName</var>, <var>exportValue</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-module-record-methods" title="Implementation of Module Record Abstract Methods"><span class="secnum">16.2.1.8.4</span> Implementation of Module Record Abstract Methods</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-LoadRequestedModules" title="LoadRequestedModules ( [ hostDefined ] )"><span class="secnum">16.2.1.8.4.1</span> LoadRequestedModules ( [ <var>hostDefined</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-getexportednames" title="GetExportedNames ( [ exportStarSet ] )"><span class="secnum">16.2.1.8.4.2</span> GetExportedNames ( [ <var>exportStarSet</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-resolveexport" title="ResolveExport ( exportName [ , resolveSet ] )"><span class="secnum">16.2.1.8.4.3</span> ResolveExport ( <var>exportName</var> [ , <var>resolveSet</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-Link" title="Link ( )"><span class="secnum">16.2.1.8.4.4</span> Link ( )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-smr-Evaluate" title="Evaluate ( )"><span class="secnum">16.2.1.8.4.5</span> Evaluate ( )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-GetImportedModule" title="GetImportedModule ( referrer, request )"><span class="secnum">16.2.1.9</span> GetImportedModule ( <var>referrer</var>, <var>request</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-HostLoadImportedModule" title="HostLoadImportedModule ( referrer, moduleRequest, hostDefined, payload )"><span class="secnum">16.2.1.10</span> HostLoadImportedModule ( <var>referrer</var>, <var>moduleRequest</var>, <var>hostDefined</var>, <var>payload</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-FinishLoadingImportedModule" title="FinishLoadingImportedModule ( referrer, moduleRequest, payload, result )"><span class="secnum">16.2.1.11</span> FinishLoadingImportedModule ( <var>referrer</var>, <var>moduleRequest</var>, <var>payload</var>, <var>result</var> )</a></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-AllImportAttributesSupported" title="AllImportAttributesSupported ( attributes )"><span class="secnum">16.2.1.12</span> AllImportAttributesSupported ( <var>attributes</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-hostgetsupportedimportattributes" title="HostGetSupportedImportAttributes ( )"><span class="secnum">16.2.1.12.1</span> HostGetSupportedImportAttributes ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-getmodulenamespace" title="GetModuleNamespace ( module )"><span class="secnum">16.2.1.13</span> GetModuleNamespace ( <var>module</var> )</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-module-semantics-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">16.2.1.14</span> RS: Evaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-imports" title="Imports"><span class="secnum">16.2.2</span> Imports</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-imports-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">16.2.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-importentries" title="Static Semantics: ImportEntries"><span class="secnum">16.2.2.2</span> SS: ImportEntries</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-importentriesformodule" title="Static Semantics: ImportEntriesForModule"><span class="secnum">16.2.2.3</span> SS: ImportEntriesForModule</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-withclausetoattributes" title="Static Semantics: WithClauseToAttributes"><span class="secnum">16.2.2.4</span> SS: WithClauseToAttributes</a></li></ol></li><li><span class="item-toggle">+</span><a href="ecmascript-language-scripts-and-modules.html#sec-exports" title="Exports"><span class="secnum">16.2.3</span> Exports</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-exports-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">16.2.3.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-exportedbindings" title="Static Semantics: ExportedBindings"><span class="secnum">16.2.3.2</span> SS: ExportedBindings</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-exportednames" title="Static Semantics: ExportedNames"><span class="secnum">16.2.3.3</span> SS: ExportedNames</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-exportentries" title="Static Semantics: ExportEntries"><span class="secnum">16.2.3.4</span> SS: ExportEntries</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-exportentriesformodule" title="Static Semantics: ExportEntriesForModule"><span class="secnum">16.2.3.5</span> SS: ExportEntriesForModule</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-static-semantics-referencedbindings" title="Static Semantics: ReferencedBindings"><span class="secnum">16.2.3.6</span> SS: ReferencedBindings</a></li><li><span class="item-toggle-none"></span><a href="ecmascript-language-scripts-and-modules.html#sec-exports-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">16.2.3.7</span> RS: Evaluation</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="error-handling-and-language-extensions.html#sec-error-handling-and-language-extensions" title="Error Handling and Language Extensions"><span class="secnum">17</span> Error Handling and Language Extensions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="error-handling-and-language-extensions.html#sec-forbidden-extensions" title="Forbidden Extensions"><span class="secnum">17.1</span> Forbidden Extensions</a></li></ol></li><li><span class="item-toggle-none"></span><a href="ecmascript-standard-built-in-objects.html#sec-ecmascript-standard-built-in-objects" title="ECMAScript Standard Built-in Objects"><span class="secnum">18</span> ECMAScript Standard Built-in Objects</a></li><li><span class="item-toggle">+</span><a href="global-object.html#sec-global-object" title="The Global Object"><span class="secnum">19</span> The Global Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="global-object.html#sec-value-properties-of-the-global-object" title="Value Properties of the Global Object"><span class="secnum">19.1</span> Value Properties of the Global Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="global-object.html#sec-globalthis" title="globalThis"><span class="secnum">19.1.1</span> globalThis</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-value-properties-of-the-global-object-infinity" title="Infinity"><span class="secnum">19.1.2</span> Infinity</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-value-properties-of-the-global-object-nan" title="NaN"><span class="secnum">19.1.3</span> NaN</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-undefined" title="undefined"><span class="secnum">19.1.4</span> undefined</a></li></ol></li><li><span class="item-toggle">+</span><a href="global-object.html#sec-function-properties-of-the-global-object" title="Function Properties of the Global Object"><span class="secnum">19.2</span> Function Properties of the Global Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="global-object.html#sec-eval-x" title="eval ( x )"><span class="secnum">19.2.1</span> eval ( <var>x</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="global-object.html#sec-performeval" title="PerformEval ( x, strictCaller, direct )"><span class="secnum">19.2.1.1</span> PerformEval ( <var>x</var>, <var>strictCaller</var>, <var>direct</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-hostensurecancompilestrings" title="HostEnsureCanCompileStrings ( calleeRealm, parameterStrings, bodyString, direct )"><span class="secnum">19.2.1.2</span> HostEnsureCanCompileStrings ( <var>calleeRealm</var>, <var>parameterStrings</var>, <var>bodyString</var>, <var>direct</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-evaldeclarationinstantiation" title="EvalDeclarationInstantiation ( body, varEnv, lexEnv, privateEnv, strict )"><span class="secnum">19.2.1.3</span> EvalDeclarationInstantiation ( <var>body</var>, <var>varEnv</var>, <var>lexEnv</var>, <var>privateEnv</var>, <var>strict</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-isfinite-number" title="isFinite ( number )"><span class="secnum">19.2.2</span> isFinite ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-isnan-number" title="isNaN ( number )"><span class="secnum">19.2.3</span> isNaN ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-parsefloat-string" title="parseFloat ( string )"><span class="secnum">19.2.4</span> parseFloat ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-parseint-string-radix" title="parseInt ( string, radix )"><span class="secnum">19.2.5</span> parseInt ( <var>string</var>, <var>radix</var> )</a></li><li><span class="item-toggle">+</span><a href="global-object.html#sec-uri-handling-functions" title="URI Handling Functions"><span class="secnum">19.2.6</span> URI Handling Functions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="global-object.html#sec-decodeuri-encodeduri" title="decodeURI ( encodedURI )"><span class="secnum">19.2.6.1</span> decodeURI ( <var>encodedURI</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-decodeuricomponent-encodeduricomponent" title="decodeURIComponent ( encodedURIComponent )"><span class="secnum">19.2.6.2</span> decodeURIComponent ( <var>encodedURIComponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-encodeuri-uri" title="encodeURI ( uri )"><span class="secnum">19.2.6.3</span> encodeURI ( <var>uri</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-encodeuricomponent-uricomponent" title="encodeURIComponent ( uriComponent )"><span class="secnum">19.2.6.4</span> encodeURIComponent ( <var>uriComponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-encode" title="Encode ( string, extraUnescaped )"><span class="secnum">19.2.6.5</span> Encode ( <var>string</var>, <var>extraUnescaped</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-decode" title="Decode ( string, preserveEscapeSet )"><span class="secnum">19.2.6.6</span> Decode ( <var>string</var>, <var>preserveEscapeSet</var> )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-parsehexoctet" title="ParseHexOctet ( string, position )"><span class="secnum">19.2.6.7</span> ParseHexOctet ( <var>string</var>, <var>position</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="global-object.html#sec-constructor-properties-of-the-global-object" title="Constructor Properties of the Global Object"><span class="secnum">19.3</span> Constructor Properties of the Global Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-aggregate-error" title="AggregateError ( . . . )"><span class="secnum">19.3.1</span> AggregateError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-array" title="Array ( . . . )"><span class="secnum">19.3.2</span> Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-arraybuffer" title="ArrayBuffer ( . . . )"><span class="secnum">19.3.3</span> ArrayBuffer ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-bigint" title="BigInt ( . . . )"><span class="secnum">19.3.4</span> BigInt ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-bigint64array" title="BigInt64Array ( . . . )"><span class="secnum">19.3.5</span> BigInt64Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-biguint64array" title="BigUint64Array ( . . . )"><span class="secnum">19.3.6</span> BigUint64Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-boolean" title="Boolean ( . . . )"><span class="secnum">19.3.7</span> Boolean ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-dataview" title="DataView ( . . . )"><span class="secnum">19.3.8</span> DataView ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-date" title="Date ( . . . )"><span class="secnum">19.3.9</span> Date ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-error" title="Error ( . . . )"><span class="secnum">19.3.10</span> Error ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-evalerror" title="EvalError ( . . . )"><span class="secnum">19.3.11</span> EvalError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-finalization-registry" title="FinalizationRegistry ( . . . )"><span class="secnum">19.3.12</span> FinalizationRegistry ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-float16array" title="Float16Array ( . . . )"><span class="secnum">19.3.13</span> Float16Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-float32array" title="Float32Array ( . . . )"><span class="secnum">19.3.14</span> Float32Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-float64array" title="Float64Array ( . . . )"><span class="secnum">19.3.15</span> Float64Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-function" title="Function ( . . . )"><span class="secnum">19.3.16</span> Function ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-int8array" title="Int8Array ( . . . )"><span class="secnum">19.3.17</span> Int8Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-int16array" title="Int16Array ( . . . )"><span class="secnum">19.3.18</span> Int16Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-int32array" title="Int32Array ( . . . )"><span class="secnum">19.3.19</span> Int32Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-iterator" title="Iterator ( . . . )"><span class="secnum">19.3.20</span> Iterator ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-map" title="Map ( . . . )"><span class="secnum">19.3.21</span> Map ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-number" title="Number ( . . . )"><span class="secnum">19.3.22</span> Number ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-object" title="Object ( . . . )"><span class="secnum">19.3.23</span> Object ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-promise" title="Promise ( . . . )"><span class="secnum">19.3.24</span> Promise ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-proxy" title="Proxy ( . . . )"><span class="secnum">19.3.25</span> Proxy ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-rangeerror" title="RangeError ( . . . )"><span class="secnum">19.3.26</span> RangeError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-referenceerror" title="ReferenceError ( . . . )"><span class="secnum">19.3.27</span> ReferenceError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-regexp" title="RegExp ( . . . )"><span class="secnum">19.3.28</span> RegExp ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-set" title="Set ( . . . )"><span class="secnum">19.3.29</span> Set ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-sharedarraybuffer" title="SharedArrayBuffer ( . . . )"><span class="secnum">19.3.30</span> SharedArrayBuffer ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-string" title="String ( . . . )"><span class="secnum">19.3.31</span> String ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-symbol" title="Symbol ( . . . )"><span class="secnum">19.3.32</span> Symbol ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-syntaxerror" title="SyntaxError ( . . . )"><span class="secnum">19.3.33</span> SyntaxError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-typeerror" title="TypeError ( . . . )"><span class="secnum">19.3.34</span> TypeError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-uint8array" title="Uint8Array ( . . . )"><span class="secnum">19.3.35</span> Uint8Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-uint8clampedarray" title="Uint8ClampedArray ( . . . )"><span class="secnum">19.3.36</span> Uint8ClampedArray ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-uint16array" title="Uint16Array ( . . . )"><span class="secnum">19.3.37</span> Uint16Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-uint32array" title="Uint32Array ( . . . )"><span class="secnum">19.3.38</span> Uint32Array ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-urierror" title="URIError ( . . . )"><span class="secnum">19.3.39</span> URIError ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-weakmap" title="WeakMap ( . . . )"><span class="secnum">19.3.40</span> WeakMap ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-weakref" title="WeakRef ( . . . )"><span class="secnum">19.3.41</span> WeakRef ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-constructor-properties-of-the-global-object-weakset" title="WeakSet ( . . . )"><span class="secnum">19.3.42</span> WeakSet ( . . . )</a></li></ol></li><li><span class="item-toggle">+</span><a href="global-object.html#sec-other-properties-of-the-global-object" title="Other Properties of the Global Object"><span class="secnum">19.4</span> Other Properties of the Global Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="global-object.html#sec-atomics" title="Atomics"><span class="secnum">19.4.1</span> Atomics</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-json" title="JSON"><span class="secnum">19.4.2</span> JSON</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-math" title="Math"><span class="secnum">19.4.3</span> Math</a></li><li><span class="item-toggle-none"></span><a href="global-object.html#sec-reflect" title="Reflect"><span class="secnum">19.4.4</span> Reflect</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object-constructor" title="The Object Constructor"><span class="secnum">20.1.1</span> The Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object-value" title="Object ( value )"><span class="secnum">20.1.1.1</span> Object ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.assign" title="Object.assign ( target, ...sources )"><span class="secnum">20.1.2.1</span> Object.assign ( <var>target</var>, ...<var>sources</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.create" title="Object.create ( O, Properties )"><span class="secnum">20.1.2.2</span> Object.create ( <var>O</var>, <var>Properties</var> )</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object.defineproperties" title="Object.defineProperties ( O, Properties )"><span class="secnum">20.1.2.3</span> Object.defineProperties ( <var>O</var>, <var>Properties</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-objectdefineproperties" title="ObjectDefineProperties ( O, Properties )"><span class="secnum">20.1.2.3.1</span> ObjectDefineProperties ( <var>O</var>, <var>Properties</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.defineproperty" title="Object.defineProperty ( O, P, Attributes )"><span class="secnum">20.1.2.4</span> Object.defineProperty ( <var>O</var>, <var>P</var>, <var>Attributes</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.entries" title="Object.entries ( O )"><span class="secnum">20.1.2.5</span> Object.entries ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.freeze" title="Object.freeze ( O )"><span class="secnum">20.1.2.6</span> Object.freeze ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.fromentries" title="Object.fromEntries ( iterable )"><span class="secnum">20.1.2.7</span> Object.fromEntries ( <var>iterable</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.getownpropertydescriptor" title="Object.getOwnPropertyDescriptor ( O, P )"><span class="secnum">20.1.2.8</span> Object.getOwnPropertyDescriptor ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.getownpropertydescriptors" title="Object.getOwnPropertyDescriptors ( O )"><span class="secnum">20.1.2.9</span> Object.getOwnPropertyDescriptors ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.getownpropertynames" title="Object.getOwnPropertyNames ( O )"><span class="secnum">20.1.2.10</span> Object.getOwnPropertyNames ( <var>O</var> )</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object.getownpropertysymbols" title="Object.getOwnPropertySymbols ( O )"><span class="secnum">20.1.2.11</span> Object.getOwnPropertySymbols ( <var>O</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-getownpropertykeys" title="GetOwnPropertyKeys ( O, type )"><span class="secnum">20.1.2.11.1</span> GetOwnPropertyKeys ( <var>O</var>, <var>type</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.getprototypeof" title="Object.getPrototypeOf ( O )"><span class="secnum">20.1.2.12</span> Object.getPrototypeOf ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.groupby" title="Object.groupBy ( items, callback )"><span class="secnum">20.1.2.13</span> Object.groupBy ( <var>items</var>, <var>callback</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.hasown" title="Object.hasOwn ( O, P )"><span class="secnum">20.1.2.14</span> Object.hasOwn ( <var>O</var>, <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.is" title="Object.is ( value1, value2 )"><span class="secnum">20.1.2.15</span> Object.is ( <var>value1</var>, <var>value2</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.isextensible" title="Object.isExtensible ( O )"><span class="secnum">20.1.2.16</span> Object.isExtensible ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.isfrozen" title="Object.isFrozen ( O )"><span class="secnum">20.1.2.17</span> Object.isFrozen ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.issealed" title="Object.isSealed ( O )"><span class="secnum">20.1.2.18</span> Object.isSealed ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.keys" title="Object.keys ( O )"><span class="secnum">20.1.2.19</span> Object.keys ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.preventextensions" title="Object.preventExtensions ( O )"><span class="secnum">20.1.2.20</span> Object.preventExtensions ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype" title="Object.prototype"><span class="secnum">20.1.2.21</span> Object.prototype</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.seal" title="Object.seal ( O )"><span class="secnum">20.1.2.22</span> Object.seal ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.setprototypeof" title="Object.setPrototypeOf ( O, proto )"><span class="secnum">20.1.2.23</span> Object.setPrototypeOf ( <var>O</var>, <var>proto</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.values" title="Object.values ( O )"><span class="secnum">20.1.2.24</span> Object.values ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object" title="Properties of the Object Prototype Object"><span class="secnum">20.1.3</span> Properties of the Object Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.constructor" title="Object.prototype.constructor"><span class="secnum">20.1.3.1</span> Object.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.hasownproperty" title="Object.prototype.hasOwnProperty ( V )"><span class="secnum">20.1.3.2</span> Object.prototype.hasOwnProperty ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.isprototypeof" title="Object.prototype.isPrototypeOf ( V )"><span class="secnum">20.1.3.3</span> Object.prototype.isPrototypeOf ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.propertyisenumerable" title="Object.prototype.propertyIsEnumerable ( V )"><span class="secnum">20.1.3.4</span> Object.prototype.propertyIsEnumerable ( <var>V</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.tolocalestring" title="Object.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">20.1.3.5</span> Object.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.tostring" title="Object.prototype.toString ( )"><span class="secnum">20.1.3.6</span> Object.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.valueof" title="Object.prototype.valueOf ( )"><span class="secnum">20.1.3.7</span> Object.prototype.valueOf ( )</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object.prototype.__proto__" title="Object.prototype.__proto__"><span class="secnum">20.1.3.8</span> Object.prototype.__proto__</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-get-object.prototype.__proto__" title="get Object.prototype.__proto__"><span class="secnum">20.1.3.8.1</span> get Object.prototype.__proto__</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-set-object.prototype.__proto__" title="set Object.prototype.__proto__"><span class="secnum">20.1.3.8.2</span> set Object.prototype.__proto__</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-object.prototype-legacy-accessor-methods" title="Legacy Object.prototype Accessor Methods"><span class="secnum">20.1.3.9</span> Legacy Object.prototype Accessor Methods</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.__defineGetter__" title="Object.prototype.__defineGetter__ ( P, getter )"><span class="secnum">20.1.3.9.1</span> Object.prototype.__defineGetter__ ( <var>P</var>, <var>getter</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.__defineSetter__" title="Object.prototype.__defineSetter__ ( P, setter )"><span class="secnum">20.1.3.9.2</span> Object.prototype.__defineSetter__ ( <var>P</var>, <var>setter</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.__lookupGetter__" title="Object.prototype.__lookupGetter__ ( P )"><span class="secnum">20.1.3.9.3</span> Object.prototype.__lookupGetter__ ( <var>P</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-object.prototype.__lookupSetter__" title="Object.prototype.__lookupSetter__ ( P )"><span class="secnum">20.1.3.9.4</span> Object.prototype.__lookupSetter__ ( <var>P</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-properties-of-object-instances" title="Properties of Object Instances"><span class="secnum">20.1.4</span> Properties of Object Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-function-constructor" title="The Function Constructor"><span class="secnum">20.2.1</span> The Function Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-function-p1-p2-pn-body" title="Function ( ...parameterArgs, bodyArg )"><span class="secnum">20.2.1.1</span> Function ( ...<var>parameterArgs</var>, <var>bodyArg</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-createdynamicfunction" title="CreateDynamicFunction ( constructor, newTarget, kind, parameterArgs, bodyArg )"><span class="secnum">20.2.1.1.1</span> CreateDynamicFunction ( <var>constructor</var>, <var>newTarget</var>, <var>kind</var>, <var>parameterArgs</var>, <var>bodyArg</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function.prototype" title="Function.prototype"><span class="secnum">20.2.2.1</span> Function.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function.prototype.apply" title="Function.prototype.apply ( thisArg, argArray )"><span class="secnum">20.2.3.1</span> Function.prototype.apply ( <var>thisArg</var>, <var>argArray</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function.prototype.bind" title="Function.prototype.bind ( thisArg, ...args )"><span class="secnum">20.2.3.2</span> Function.prototype.bind ( <var>thisArg</var>, ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a 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class="item-toggle">+</span><a href="fundamental-objects.html#sec-function-instances" title="Function Instances"><span class="secnum">20.2.4</span> Function Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function-instances-length" title="length"><span class="secnum">20.2.4.1</span> length</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function-instances-name" title="name"><span class="secnum">20.2.4.2</span> name</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-function-instances-prototype" title="prototype"><span class="secnum">20.2.4.3</span> prototype</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-hosthassourcetextavailable" title="HostHasSourceTextAvailable ( func )"><span class="secnum">20.2.5</span> HostHasSourceTextAvailable ( <var>func</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-boolean-constructor" title="The Boolean Constructor"><span class="secnum">20.3.1</span> The Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-boolean-constructor-boolean-value" title="Boolean ( value )"><span class="secnum">20.3.1.1</span> Boolean ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-boolean.prototype" title="Boolean.prototype"><span class="secnum">20.3.2.1</span> Boolean.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-boolean-prototype-object" title="Properties of the Boolean Prototype Object"><span class="secnum">20.3.3</span> Properties of the Boolean Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-boolean.prototype.constructor" title="Boolean.prototype.constructor"><span class="secnum">20.3.3.1</span> Boolean.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-boolean.prototype.tostring" title="Boolean.prototype.toString ( )"><span class="secnum">20.3.3.2</span> Boolean.prototype.toString ( )</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-boolean.prototype.valueof" title="Boolean.prototype.valueOf ( )"><span class="secnum">20.3.3.3</span> Boolean.prototype.valueOf ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-thisbooleanvalue" title="ThisBooleanValue ( value )"><span class="secnum">20.3.3.3.1</span> ThisBooleanValue ( <var>value</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-properties-of-boolean-instances" title="Properties of Boolean Instances"><span class="secnum">20.3.4</span> Properties of Boolean Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-symbol-constructor" title="The Symbol Constructor"><span class="secnum">20.4.1</span> The Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol-description" title="Symbol ( [ description ] )"><span class="secnum">20.4.1.1</span> Symbol ( [ <var>description</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.asynciterator" title="Symbol.asyncIterator"><span class="secnum">20.4.2.1</span> Symbol.asyncIterator</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.for" title="Symbol.for ( key )"><span class="secnum">20.4.2.2</span> Symbol.for ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.hasinstance" title="Symbol.hasInstance"><span class="secnum">20.4.2.3</span> Symbol.hasInstance</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.isconcatspreadable" title="Symbol.isConcatSpreadable"><span class="secnum">20.4.2.4</span> Symbol.isConcatSpreadable</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.iterator" title="Symbol.iterator"><span class="secnum">20.4.2.5</span> Symbol.iterator</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.keyfor" title="Symbol.keyFor ( sym )"><span class="secnum">20.4.2.6</span> Symbol.keyFor ( <var>sym</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.match" title="Symbol.match"><span class="secnum">20.4.2.7</span> Symbol.match</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.matchall" title="Symbol.matchAll"><span class="secnum">20.4.2.8</span> Symbol.matchAll</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.prototype" title="Symbol.prototype"><span class="secnum">20.4.2.9</span> Symbol.prototype</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.replace" title="Symbol.replace"><span class="secnum">20.4.2.10</span> Symbol.replace</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.search" title="Symbol.search"><span class="secnum">20.4.2.11</span> Symbol.search</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.species" title="Symbol.species"><span class="secnum">20.4.2.12</span> Symbol.species</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.split" title="Symbol.split"><span class="secnum">20.4.2.13</span> Symbol.split</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.toprimitive" title="Symbol.toPrimitive"><span class="secnum">20.4.2.14</span> Symbol.toPrimitive</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.tostringtag" title="Symbol.toStringTag"><span class="secnum">20.4.2.15</span> Symbol.toStringTag</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.unscopables" title="Symbol.unscopables"><span class="secnum">20.4.2.16</span> Symbol.unscopables</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-symbol-prototype-object" title="Properties of the Symbol Prototype Object"><span class="secnum">20.4.3</span> Properties of the Symbol Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.prototype.constructor" title="Symbol.prototype.constructor"><span class="secnum">20.4.3.1</span> Symbol.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.prototype.description" title="get Symbol.prototype.description"><span class="secnum">20.4.3.2</span> get Symbol.prototype.description</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-symbol.prototype.tostring" title="Symbol.prototype.toString ( )"><span class="secnum">20.4.3.3</span> Symbol.prototype.toString ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symboldescriptivestring" title="SymbolDescriptiveString ( sym )"><span class="secnum">20.4.3.3.1</span> SymbolDescriptiveString ( <var>sym</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-symbol.prototype.valueof" title="Symbol.prototype.valueOf ( )"><span class="secnum">20.4.3.4</span> Symbol.prototype.valueOf ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-thissymbolvalue" title="ThisSymbolValue ( value )"><span class="secnum">20.4.3.4.1</span> ThisSymbolValue ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.prototype-%symbol.toprimitive%" title="Symbol.prototype [ %Symbol.toPrimitive% ] ( hint )"><span class="secnum">20.4.3.5</span> Symbol.prototype [ %Symbol.toPrimitive% ] ( <var>hint</var> )</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-symbol.prototype-%symbol.tostringtag%" title="Symbol.prototype [ %Symbol.toStringTag% ]"><span class="secnum">20.4.3.6</span> Symbol.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-properties-of-symbol-instances" title="Properties of Symbol Instances"><span class="secnum">20.4.4</span> Properties of Symbol Instances</a></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-abstract-operations-for-symbols" title="Abstract Operations for Symbols"><span class="secnum">20.4.5</span> Abstract Operations for Symbols</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-keyforsymbol" title="KeyForSymbol ( sym )"><span class="secnum">20.4.5.1</span> KeyForSymbol ( <var>sym</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-error-constructor" title="The Error Constructor"><span class="secnum">20.5.1</span> The Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-error-message" title="Error ( message [ , options ] )"><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span 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href="fundamental-objects.html#sec-error.prototype.constructor" title="Error.prototype.constructor"><span class="secnum">20.5.3.1</span> Error.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-error.prototype.message" title="Error.prototype.message"><span class="secnum">20.5.3.2</span> Error.prototype.message</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-error.prototype.name" title="Error.prototype.name"><span class="secnum">20.5.3.3</span> Error.prototype.name</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-error.prototype.tostring" title="Error.prototype.toString ( )"><span class="secnum">20.5.3.4</span> Error.prototype.toString ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-properties-of-error-instances" title="Properties of Error Instances"><span class="secnum">20.5.4</span> Properties of 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AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-aggregate-error.prototype" title="AggregateError.prototype"><span class="secnum">20.5.7.2.1</span> AggregateError.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-properties-of-the-aggregate-error-prototype-objects" title="Properties of the AggregateError Prototype Object"><span class="secnum">20.5.7.3</span> Properties of the AggregateError Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-aggregate-error.prototype.constructor" title="AggregateError.prototype.constructor"><span class="secnum">20.5.7.3.1</span> AggregateError.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-aggregate-error.prototype.message" title="AggregateError.prototype.message"><span class="secnum">20.5.7.3.2</span> AggregateError.prototype.message</a></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-aggregate-error.prototype.name" title="AggregateError.prototype.name"><span class="secnum">20.5.7.3.3</span> AggregateError.prototype.name</a></li></ol></li><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-properties-of-aggregate-error-instances" title="Properties of AggregateError Instances"><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="fundamental-objects.html#sec-abstract-operations-for-error-objects" title="Abstract Operations for Error Objects"><span class="secnum">20.5.8</span> Abstract Operations for Error Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="fundamental-objects.html#sec-installerrorcause" title="InstallErrorCause ( O, options )"><span class="secnum">20.5.8.1</span> InstallErrorCause ( <var>O</var>, <var>options</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-number-constructor" title="The Number Constructor"><span class="secnum">21.1.1</span> The Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number-constructor-number-value" title="Number ( value )"><span class="secnum">21.1.1.1</span> Number ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.epsilon" title="Number.EPSILON"><span class="secnum">21.1.2.1</span> Number.EPSILON</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.isfinite" title="Number.isFinite ( number )"><span class="secnum">21.1.2.2</span> Number.isFinite ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.isinteger" title="Number.isInteger ( number )"><span class="secnum">21.1.2.3</span> Number.isInteger ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.isnan" title="Number.isNaN ( number )"><span class="secnum">21.1.2.4</span> Number.isNaN ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.issafeinteger" title="Number.isSafeInteger ( number )"><span class="secnum">21.1.2.5</span> Number.isSafeInteger ( <var>number</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.max_safe_integer" title="Number.MAX_SAFE_INTEGER"><span class="secnum">21.1.2.6</span> Number.MAX_SAFE_INTEGER</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.max_value" title="Number.MAX_VALUE"><span class="secnum">21.1.2.7</span> Number.MAX_VALUE</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.min_safe_integer" title="Number.MIN_SAFE_INTEGER"><span class="secnum">21.1.2.8</span> Number.MIN_SAFE_INTEGER</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.min_value" title="Number.MIN_VALUE"><span class="secnum">21.1.2.9</span> Number.MIN_VALUE</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.nan" title="Number.NaN"><span class="secnum">21.1.2.10</span> Number.NaN</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.negative_infinity" title="Number.NEGATIVE_INFINITY"><span class="secnum">21.1.2.11</span> Number.NEGATIVE_INFINITY</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.parsefloat" title="Number.parseFloat ( string )"><span class="secnum">21.1.2.12</span> Number.parseFloat ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.parseint" title="Number.parseInt ( string, radix )"><span class="secnum">21.1.2.13</span> Number.parseInt ( <var>string</var>, <var>radix</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.positive_infinity" title="Number.POSITIVE_INFINITY"><span class="secnum">21.1.2.14</span> Number.POSITIVE_INFINITY</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype" title="Number.prototype"><span class="secnum">21.1.2.15</span> Number.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">21.1.3</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.constructor" title="Number.prototype.constructor"><span class="secnum">21.1.3.1</span> Number.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.toexponential" title="Number.prototype.toExponential ( fractionDigits )"><span class="secnum">21.1.3.2</span> Number.prototype.toExponential ( <var>fractionDigits</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.tofixed" title="Number.prototype.toFixed ( fractionDigits )"><span class="secnum">21.1.3.3</span> Number.prototype.toFixed ( <var>fractionDigits</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.tolocalestring" title="Number.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">21.1.3.4</span> Number.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.toprecision" title="Number.prototype.toPrecision ( precision )"><span class="secnum">21.1.3.5</span> Number.prototype.toPrecision ( <var>precision</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-number.prototype.tostring" title="Number.prototype.toString ( [ radix ] )"><span class="secnum">21.1.3.6</span> Number.prototype.toString ( [ <var>radix</var> ] )</a></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-number.prototype.valueof" title="Number.prototype.valueOf ( )"><span class="secnum">21.1.3.7</span> Number.prototype.valueOf ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-thisnumbervalue" title="ThisNumberValue ( value )"><span class="secnum">21.1.3.7.1</span> ThisNumberValue ( <var>value</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-properties-of-number-instances" title="Properties of Number Instances"><span class="secnum">21.1.4</span> Properties of Number Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-bigint-constructor" title="The BigInt Constructor"><span class="secnum">21.2.1</span> The BigInt Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-bigint-constructor-number-value" title="BigInt ( value )"><span class="secnum">21.2.1.1</span> BigInt ( <var>value</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-numbertobigint" title="NumberToBigInt ( number )"><span class="secnum">21.2.1.1.1</span> NumberToBigInt ( <var>number</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.asintn" title="BigInt.asIntN ( bits, bigint )"><span class="secnum">21.2.2.1</span> BigInt.asIntN ( <var>bits</var>, <var>bigint</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.asuintn" title="BigInt.asUintN ( bits, bigint )"><span class="secnum">21.2.2.2</span> BigInt.asUintN ( <var>bits</var>, <var>bigint</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.prototype" title="BigInt.prototype"><span class="secnum">21.2.2.3</span> BigInt.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">21.2.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.prototype.constructor" title="BigInt.prototype.constructor"><span class="secnum">21.2.3.1</span> BigInt.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.prototype.tolocalestring" title="BigInt.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">21.2.3.2</span> BigInt.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.prototype.tostring" title="BigInt.prototype.toString ( [ radix ] )"><span class="secnum">21.2.3.3</span> BigInt.prototype.toString ( [ <var>radix</var> ] )</a></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-bigint.prototype.valueof" title="BigInt.prototype.valueOf ( )"><span class="secnum">21.2.3.4</span> BigInt.prototype.valueOf ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-thisbigintvalue" title="ThisBigIntValue ( value )"><span class="secnum">21.2.3.4.1</span> ThisBigIntValue ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-bigint.prototype-%symbol.tostringtag%" title="BigInt.prototype [ %Symbol.toStringTag% ]"><span class="secnum">21.2.3.5</span> BigInt.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-properties-of-bigint-instances" title="Properties of BigInt Instances"><span class="secnum">21.2.4</span> Properties of BigInt Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-math-object" title="The Math Object"><span class="secnum">21.3</span> The Math Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-value-properties-of-the-math-object" title="Value Properties of the Math Object"><span class="secnum">21.3.1</span> Value Properties of the Math Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.e" title="Math.E"><span class="secnum">21.3.1.1</span> Math.E</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.ln10" title="Math.LN10"><span class="secnum">21.3.1.2</span> Math.LN10</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.ln2" title="Math.LN2"><span class="secnum">21.3.1.3</span> Math.LN2</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log10e" title="Math.LOG10E"><span class="secnum">21.3.1.4</span> Math.LOG10E</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log2e" title="Math.LOG2E"><span class="secnum">21.3.1.5</span> Math.LOG2E</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.pi" title="Math.PI"><span class="secnum">21.3.1.6</span> Math.PI</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sqrt1_2" title="Math.SQRT1_2"><span class="secnum">21.3.1.7</span> Math.SQRT1_2</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sqrt2" title="Math.SQRT2"><span class="secnum">21.3.1.8</span> Math.SQRT2</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math-%symbol.tostringtag%" title="Math [ %Symbol.toStringTag% ]"><span class="secnum">21.3.1.9</span> Math [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-function-properties-of-the-math-object" title="Function Properties of the Math Object"><span class="secnum">21.3.2</span> Function Properties of the Math Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.abs" title="Math.abs ( x )"><span class="secnum">21.3.2.1</span> Math.abs ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.acos" title="Math.acos ( x )"><span class="secnum">21.3.2.2</span> Math.acos ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.acosh" title="Math.acosh ( x )"><span class="secnum">21.3.2.3</span> Math.acosh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.asin" title="Math.asin ( x )"><span class="secnum">21.3.2.4</span> Math.asin ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.asinh" title="Math.asinh ( x )"><span class="secnum">21.3.2.5</span> Math.asinh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.atan" title="Math.atan ( x )"><span class="secnum">21.3.2.6</span> Math.atan ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.atanh" title="Math.atanh ( x )"><span class="secnum">21.3.2.7</span> Math.atanh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.atan2" title="Math.atan2 ( y, x )"><span class="secnum">21.3.2.8</span> Math.atan2 ( <var>y</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.cbrt" title="Math.cbrt ( x )"><span class="secnum">21.3.2.9</span> Math.cbrt ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.ceil" title="Math.ceil ( x )"><span class="secnum">21.3.2.10</span> Math.ceil ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.clz32" title="Math.clz32 ( x )"><span class="secnum">21.3.2.11</span> Math.clz32 ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.cos" title="Math.cos ( x )"><span class="secnum">21.3.2.12</span> Math.cos ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.cosh" title="Math.cosh ( x )"><span class="secnum">21.3.2.13</span> Math.cosh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.exp" title="Math.exp ( x )"><span class="secnum">21.3.2.14</span> Math.exp ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.expm1" title="Math.expm1 ( x )"><span class="secnum">21.3.2.15</span> Math.expm1 ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.floor" title="Math.floor ( x )"><span class="secnum">21.3.2.16</span> Math.floor ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.fround" title="Math.fround ( x )"><span class="secnum">21.3.2.17</span> Math.fround ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.f16round" title="Math.f16round ( x )"><span class="secnum">21.3.2.18</span> Math.f16round ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.hypot" title="Math.hypot ( ...args )"><span class="secnum">21.3.2.19</span> Math.hypot ( ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.imul" title="Math.imul ( x, y )"><span class="secnum">21.3.2.20</span> Math.imul ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log" title="Math.log ( x )"><span class="secnum">21.3.2.21</span> Math.log ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log1p" title="Math.log1p ( x )"><span class="secnum">21.3.2.22</span> Math.log1p ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log10" title="Math.log10 ( x )"><span class="secnum">21.3.2.23</span> Math.log10 ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.log2" title="Math.log2 ( x )"><span class="secnum">21.3.2.24</span> Math.log2 ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.max" title="Math.max ( ...args )"><span class="secnum">21.3.2.25</span> Math.max ( ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.min" title="Math.min ( ...args )"><span class="secnum">21.3.2.26</span> Math.min ( ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.pow" title="Math.pow ( base, exponent )"><span class="secnum">21.3.2.27</span> Math.pow ( <var>base</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.random" title="Math.random ( )"><span class="secnum">21.3.2.28</span> Math.random ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.round" title="Math.round ( x )"><span class="secnum">21.3.2.29</span> Math.round ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sign" title="Math.sign ( x )"><span class="secnum">21.3.2.30</span> Math.sign ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sin" title="Math.sin ( x )"><span class="secnum">21.3.2.31</span> Math.sin ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sinh" title="Math.sinh ( x )"><span class="secnum">21.3.2.32</span> Math.sinh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sqrt" title="Math.sqrt ( x )"><span class="secnum">21.3.2.33</span> Math.sqrt ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.sumprecise" title="Math.sumPrecise ( items )"><span class="secnum">21.3.2.34</span> Math.sumPrecise ( <var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.tan" title="Math.tan ( x )"><span class="secnum">21.3.2.35</span> Math.tan ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.tanh" title="Math.tanh ( x )"><span class="secnum">21.3.2.36</span> Math.tanh ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-math.trunc" title="Math.trunc ( x )"><span class="secnum">21.3.2.37</span> Math.trunc ( <var>x</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-overview-of-date-objects-and-definitions-of-abstract-operations" title="Overview of Date Objects and Definitions of Abstract Operations"><span class="secnum">21.4.1</span> Overview of Date Objects and Definitions of Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-time-values-and-time-range" title="Time Values and Time Range"><span class="secnum">21.4.1.1</span> Time Values and Time Range</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-time-related-constants" title="Time-related Constants"><span class="secnum">21.4.1.2</span> Time-related Constants</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-day" title="Day ( t )"><span class="secnum">21.4.1.3</span> Day ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-timewithinday" title="TimeWithinDay ( t )"><span class="secnum">21.4.1.4</span> TimeWithinDay ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-daysinyear" title="DaysInYear ( y )"><span class="secnum">21.4.1.5</span> DaysInYear ( <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-dayfromyear" title="DayFromYear ( y )"><span class="secnum">21.4.1.6</span> DayFromYear ( <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-timefromyear" title="TimeFromYear ( y )"><span class="secnum">21.4.1.7</span> TimeFromYear ( <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-yearfromtime" title="YearFromTime ( t )"><span class="secnum">21.4.1.8</span> YearFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-daywithinyear" title="DayWithinYear ( t )"><span class="secnum">21.4.1.9</span> DayWithinYear ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-inleapyear" title="InLeapYear ( t )"><span class="secnum">21.4.1.10</span> InLeapYear ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-monthfromtime" title="MonthFromTime ( t )"><span class="secnum">21.4.1.11</span> MonthFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-datefromtime" title="DateFromTime ( t )"><span class="secnum">21.4.1.12</span> DateFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-weekday" title="WeekDay ( t )"><span class="secnum">21.4.1.13</span> WeekDay ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-hourfromtime" title="HourFromTime ( t )"><span class="secnum">21.4.1.14</span> HourFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-minfromtime" title="MinFromTime ( t )"><span class="secnum">21.4.1.15</span> MinFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-secfromtime" title="SecFromTime ( t )"><span class="secnum">21.4.1.16</span> SecFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-msfromtime" title="msFromTime ( t )"><span class="secnum">21.4.1.17</span> msFromTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-getutcepochnanoseconds" title="GetUTCEpochNanoseconds ( year, month, day, hour, minute, second, millisecond, microsecond, nanosecond )"><span class="secnum">21.4.1.18</span> GetUTCEpochNanoseconds ( <var>year</var>, <var>month</var>, <var>day</var>, <var>hour</var>, <var>minute</var>, <var>second</var>, <var>millisecond</var>, <var>microsecond</var>, <var>nanosecond</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-time-zone-identifiers" title="Time Zone Identifiers"><span class="secnum">21.4.1.19</span> Time Zone Identifiers</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-getnamedtimezoneepochnanoseconds" title="GetNamedTimeZoneEpochNanoseconds ( timeZoneIdentifier, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond )"><span class="secnum">21.4.1.20</span> GetNamedTimeZoneEpochNanoseconds ( <var>timeZoneIdentifier</var>, <var>year</var>, <var>month</var>, <var>day</var>, <var>hour</var>, <var>minute</var>, <var>second</var>, <var>millisecond</var>, <var>microsecond</var>, <var>nanosecond</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-getnamedtimezoneoffsetnanoseconds" title="GetNamedTimeZoneOffsetNanoseconds ( timeZoneIdentifier, epochNanoseconds )"><span class="secnum">21.4.1.21</span> GetNamedTimeZoneOffsetNanoseconds ( <var>timeZoneIdentifier</var>, <var>epochNanoseconds</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-time-zone-identifier-record" title="Time Zone Identifier Record"><span class="secnum">21.4.1.22</span> Time Zone Identifier Record</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-availablenamedtimezoneidentifiers" title="AvailableNamedTimeZoneIdentifiers ( )"><span class="secnum">21.4.1.23</span> AvailableNamedTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-systemtimezoneidentifier" title="SystemTimeZoneIdentifier ( )"><span class="secnum">21.4.1.24</span> SystemTimeZoneIdentifier ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-localtime" title="LocalTime ( t )"><span class="secnum">21.4.1.25</span> LocalTime ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-utc-t" title="UTC ( t )"><span class="secnum">21.4.1.26</span> UTC ( <var>t</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-maketime" title="MakeTime ( hour, min, sec, ms )"><span class="secnum">21.4.1.27</span> MakeTime ( <var>hour</var>, <var>min</var>, <var>sec</var>, <var>ms</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-makeday" title="MakeDay ( year, month, date )"><span class="secnum">21.4.1.28</span> MakeDay ( <var>year</var>, <var>month</var>, <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-makedate" title="MakeDate ( day, time )"><span class="secnum">21.4.1.29</span> MakeDate ( <var>day</var>, <var>time</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-makefullyear" title="MakeFullYear ( year )"><span class="secnum">21.4.1.30</span> MakeFullYear ( <var>year</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-timeclip" title="TimeClip ( time )"><span class="secnum">21.4.1.31</span> TimeClip ( <var>time</var> )</a></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-date-time-string-format" title="Date Time String Format"><span class="secnum">21.4.1.32</span> Date Time String Format</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-expanded-years" title="Expanded Years"><span class="secnum">21.4.1.32.1</span> Expanded Years</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-time-zone-offset-strings" title="Time Zone Offset String Format"><span class="secnum">21.4.1.33</span> Time Zone Offset String Format</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-istimezoneoffsetstring" title="IsTimeZoneOffsetString ( offsetString )"><span class="secnum">21.4.1.33.1</span> IsTimeZoneOffsetString ( <var>offsetString</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-parsetimezoneoffsetstring" title="ParseTimeZoneOffsetString ( offsetString )"><span class="secnum">21.4.1.33.2</span> ParseTimeZoneOffsetString ( <var>offsetString</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-date-constructor" title="The Date Constructor"><span class="secnum">21.4.2</span> The Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date" title="Date ( ...values )"><span class="secnum">21.4.2.1</span> Date ( ...<var>values</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.now" title="Date.now ( )"><span class="secnum">21.4.3.1</span> Date.now ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.parse" title="Date.parse ( string )"><span class="secnum">21.4.3.2</span> Date.parse ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype" title="Date.prototype"><span class="secnum">21.4.3.3</span> Date.prototype</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.utc" title="Date.UTC ( year [ , month [ , date [ , hours [ , minutes [ , seconds [ , ms ] ] ] ] ] ] )"><span class="secnum">21.4.3.4</span> Date.UTC ( <var>year</var> [ , <var>month</var> [ , <var>date</var> [ , <var>hours</var> [ , <var>minutes</var> [ , <var>seconds</var> [ , <var>ms</var> ] ] ] ] ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-properties-of-the-date-prototype-object" title="Properties of the Date Prototype Object"><span class="secnum">21.4.4</span> Properties of the Date Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.constructor" title="Date.prototype.constructor"><span class="secnum">21.4.4.1</span> Date.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getdate" title="Date.prototype.getDate ( )"><span class="secnum">21.4.4.2</span> Date.prototype.getDate ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getday" title="Date.prototype.getDay ( )"><span class="secnum">21.4.4.3</span> Date.prototype.getDay ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getfullyear" title="Date.prototype.getFullYear ( )"><span class="secnum">21.4.4.4</span> Date.prototype.getFullYear ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.gethours" title="Date.prototype.getHours ( )"><span class="secnum">21.4.4.5</span> Date.prototype.getHours ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getmilliseconds" title="Date.prototype.getMilliseconds ( )"><span class="secnum">21.4.4.6</span> Date.prototype.getMilliseconds ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getminutes" title="Date.prototype.getMinutes ( )"><span class="secnum">21.4.4.7</span> Date.prototype.getMinutes ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getmonth" title="Date.prototype.getMonth ( )"><span class="secnum">21.4.4.8</span> Date.prototype.getMonth ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getseconds" title="Date.prototype.getSeconds ( )"><span class="secnum">21.4.4.9</span> Date.prototype.getSeconds ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.gettime" title="Date.prototype.getTime ( )"><span class="secnum">21.4.4.10</span> Date.prototype.getTime ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.gettimezoneoffset" title="Date.prototype.getTimezoneOffset ( )"><span class="secnum">21.4.4.11</span> Date.prototype.getTimezoneOffset ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcdate" title="Date.prototype.getUTCDate ( )"><span class="secnum">21.4.4.12</span> Date.prototype.getUTCDate ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcday" title="Date.prototype.getUTCDay ( )"><span class="secnum">21.4.4.13</span> Date.prototype.getUTCDay ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcfullyear" title="Date.prototype.getUTCFullYear ( )"><span class="secnum">21.4.4.14</span> Date.prototype.getUTCFullYear ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutchours" title="Date.prototype.getUTCHours ( )"><span class="secnum">21.4.4.15</span> Date.prototype.getUTCHours ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcmilliseconds" title="Date.prototype.getUTCMilliseconds ( )"><span class="secnum">21.4.4.16</span> Date.prototype.getUTCMilliseconds ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcminutes" title="Date.prototype.getUTCMinutes ( )"><span class="secnum">21.4.4.17</span> Date.prototype.getUTCMinutes ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcmonth" title="Date.prototype.getUTCMonth ( )"><span class="secnum">21.4.4.18</span> Date.prototype.getUTCMonth ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.getutcseconds" title="Date.prototype.getUTCSeconds ( )"><span class="secnum">21.4.4.19</span> Date.prototype.getUTCSeconds ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setdate" title="Date.prototype.setDate ( date )"><span class="secnum">21.4.4.20</span> Date.prototype.setDate ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setfullyear" title="Date.prototype.setFullYear ( year [ , month [ , date ] ] )"><span class="secnum">21.4.4.21</span> Date.prototype.setFullYear ( <var>year</var> [ , <var>month</var> [ , <var>date</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.sethours" title="Date.prototype.setHours ( hour [ , min [ , sec [ , ms ] ] ] )"><span class="secnum">21.4.4.22</span> Date.prototype.setHours ( <var>hour</var> [ , <var>min</var> [ , <var>sec</var> [ , <var>ms</var> ] ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setmilliseconds" title="Date.prototype.setMilliseconds ( ms )"><span class="secnum">21.4.4.23</span> Date.prototype.setMilliseconds ( <var>ms</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setminutes" title="Date.prototype.setMinutes ( min [ , sec [ , ms ] ] )"><span class="secnum">21.4.4.24</span> Date.prototype.setMinutes ( <var>min</var> [ , <var>sec</var> [ , <var>ms</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setmonth" title="Date.prototype.setMonth ( month [ , date ] )"><span class="secnum">21.4.4.25</span> Date.prototype.setMonth ( <var>month</var> [ , <var>date</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setseconds" title="Date.prototype.setSeconds ( sec [ , ms ] )"><span class="secnum">21.4.4.26</span> Date.prototype.setSeconds ( <var>sec</var> [ , <var>ms</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.settime" title="Date.prototype.setTime ( time )"><span class="secnum">21.4.4.27</span> Date.prototype.setTime ( <var>time</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcdate" title="Date.prototype.setUTCDate ( date )"><span class="secnum">21.4.4.28</span> Date.prototype.setUTCDate ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcfullyear" title="Date.prototype.setUTCFullYear ( year [ , month [ , date ] ] )"><span class="secnum">21.4.4.29</span> Date.prototype.setUTCFullYear ( <var>year</var> [ , <var>month</var> [ , <var>date</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutchours" title="Date.prototype.setUTCHours ( hour [ , min [ , sec [ , ms ] ] ] )"><span class="secnum">21.4.4.30</span> Date.prototype.setUTCHours ( <var>hour</var> [ , <var>min</var> [ , <var>sec</var> [ , <var>ms</var> ] ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcmilliseconds" title="Date.prototype.setUTCMilliseconds ( ms )"><span class="secnum">21.4.4.31</span> Date.prototype.setUTCMilliseconds ( <var>ms</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcminutes" title="Date.prototype.setUTCMinutes ( min [ , sec [ , ms ] ] )"><span class="secnum">21.4.4.32</span> Date.prototype.setUTCMinutes ( <var>min</var> [ , <var>sec</var> [ , <var>ms</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcmonth" title="Date.prototype.setUTCMonth ( month [ , date ] )"><span class="secnum">21.4.4.33</span> Date.prototype.setUTCMonth ( <var>month</var> [ , <var>date</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.setutcseconds" title="Date.prototype.setUTCSeconds ( sec [ , ms ] )"><span class="secnum">21.4.4.34</span> Date.prototype.setUTCSeconds ( <var>sec</var> [ , <var>ms</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.todatestring" title="Date.prototype.toDateString ( )"><span class="secnum">21.4.4.35</span> Date.prototype.toDateString ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.toisostring" title="Date.prototype.toISOString ( )"><span class="secnum">21.4.4.36</span> Date.prototype.toISOString ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.tojson" title="Date.prototype.toJSON ( key )"><span class="secnum">21.4.4.37</span> Date.prototype.toJSON ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.tolocaledatestring" title="Date.prototype.toLocaleDateString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">21.4.4.38</span> Date.prototype.toLocaleDateString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.tolocalestring" title="Date.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">21.4.4.39</span> Date.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.tolocaletimestring" title="Date.prototype.toLocaleTimeString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">21.4.4.40</span> Date.prototype.toLocaleTimeString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle">+</span><a href="numbers-and-dates.html#sec-date.prototype.tostring" title="Date.prototype.toString ( )"><span class="secnum">21.4.4.41</span> Date.prototype.toString ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-timestring" title="TimeString ( tv )"><span class="secnum">21.4.4.41.1</span> TimeString ( <var>tv</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-datestring" title="DateString ( tv )"><span class="secnum">21.4.4.41.2</span> DateString ( <var>tv</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-timezoneestring" title="TimeZoneString ( tv )"><span class="secnum">21.4.4.41.3</span> TimeZoneString ( <var>tv</var> )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-todatestring" title="ToDateString ( tv )"><span class="secnum">21.4.4.41.4</span> ToDateString ( <var>tv</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.totimestring" title="Date.prototype.toTimeString ( )"><span class="secnum">21.4.4.42</span> Date.prototype.toTimeString ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.toutcstring" title="Date.prototype.toUTCString ( )"><span class="secnum">21.4.4.43</span> Date.prototype.toUTCString ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype.valueof" title="Date.prototype.valueOf ( )"><span class="secnum">21.4.4.44</span> Date.prototype.valueOf ( )</a></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-date.prototype-%symbol.toprimitive%" title="Date.prototype [ %Symbol.toPrimitive% ] ( hint )"><span class="secnum">21.4.4.45</span> Date.prototype [ %Symbol.toPrimitive% ] ( <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="numbers-and-dates.html#sec-properties-of-date-instances" title="Properties of Date Instances"><span class="secnum">21.4.5</span> Properties of Date Instances</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string-constructor" title="The String Constructor"><span class="secnum">22.1.1</span> The String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string-constructor-string-value" title="String ( value )"><span class="secnum">22.1.1.1</span> String ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.fromcharcode" title="String.fromCharCode ( ...codeUnits )"><span class="secnum">22.1.2.1</span> String.fromCharCode ( ...<var>codeUnits</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.fromcodepoint" title="String.fromCodePoint ( ...codePoints )"><span class="secnum">22.1.2.2</span> String.fromCodePoint ( ...<var>codePoints</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype" title="String.prototype"><span class="secnum">22.1.2.3</span> String.prototype</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.raw" title="String.raw ( template, ...substitutions )"><span class="secnum">22.1.2.4</span> String.raw ( <var>template</var>, ...<var>substitutions</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">22.1.3</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.at" title="String.prototype.at ( index )"><span class="secnum">22.1.3.1</span> String.prototype.at ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.charat" title="String.prototype.charAt ( pos )"><span class="secnum">22.1.3.2</span> String.prototype.charAt ( <var>pos</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.charcodeat" title="String.prototype.charCodeAt ( pos )"><span class="secnum">22.1.3.3</span> String.prototype.charCodeAt ( <var>pos</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.codepointat" title="String.prototype.codePointAt ( pos )"><span class="secnum">22.1.3.4</span> String.prototype.codePointAt ( <var>pos</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.concat" title="String.prototype.concat ( ...args )"><span class="secnum">22.1.3.5</span> String.prototype.concat ( ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.constructor" title="String.prototype.constructor"><span class="secnum">22.1.3.6</span> String.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.endswith" title="String.prototype.endsWith ( searchString [ , endPosition ] )"><span class="secnum">22.1.3.7</span> String.prototype.endsWith ( <var>searchString</var> [ , <var>endPosition</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.includes" title="String.prototype.includes ( searchString [ , position ] )"><span class="secnum">22.1.3.8</span> String.prototype.includes ( <var>searchString</var> [ , <var>position</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.indexof" title="String.prototype.indexOf ( searchString [ , position ] )"><span class="secnum">22.1.3.9</span> String.prototype.indexOf ( <var>searchString</var> [ , <var>position</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.iswellformed" title="String.prototype.isWellFormed ( )"><span class="secnum">22.1.3.10</span> String.prototype.isWellFormed ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.lastindexof" title="String.prototype.lastIndexOf ( searchString [ , position ] )"><span class="secnum">22.1.3.11</span> String.prototype.lastIndexOf ( <var>searchString</var> [ , <var>position</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.localecompare" title="String.prototype.localeCompare ( that [ , reserved1 [ , reserved2 ] ] )"><span class="secnum">22.1.3.12</span> String.prototype.localeCompare ( <var>that</var> [ , <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.match" title="String.prototype.match ( regexp )"><span class="secnum">22.1.3.13</span> String.prototype.match ( <var>regexp</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.matchall" title="String.prototype.matchAll ( regexp )"><span class="secnum">22.1.3.14</span> String.prototype.matchAll ( <var>regexp</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.normalize" title="String.prototype.normalize ( [ form ] )"><span class="secnum">22.1.3.15</span> String.prototype.normalize ( [ <var>form</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.padend" title="String.prototype.padEnd ( maxLength [ , fillString ] )"><span class="secnum">22.1.3.16</span> String.prototype.padEnd ( <var>maxLength</var> [ , <var>fillString</var> ] )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string.prototype.padstart" title="String.prototype.padStart ( maxLength [ , fillString ] )"><span class="secnum">22.1.3.17</span> String.prototype.padStart ( <var>maxLength</var> [ , <var>fillString</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-stringpaddingbuiltinsimpl" title="StringPaddingBuiltinsImpl ( O, maxLength, fillString, placement )"><span class="secnum">22.1.3.17.1</span> StringPaddingBuiltinsImpl ( <var>O</var>, <var>maxLength</var>, <var>fillString</var>, <var>placement</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-stringpad" title="StringPad ( S, maxLength, fillString, placement )"><span class="secnum">22.1.3.17.2</span> StringPad ( <var>S</var>, <var>maxLength</var>, <var>fillString</var>, <var>placement</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-tozeropaddeddecimalstring" title="ToZeroPaddedDecimalString ( n, minLength )"><span class="secnum">22.1.3.17.3</span> ToZeroPaddedDecimalString ( <var>n</var>, <var>minLength</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.repeat" title="String.prototype.repeat ( count )"><span class="secnum">22.1.3.18</span> String.prototype.repeat ( <var>count</var> )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string.prototype.replace" title="String.prototype.replace ( searchValue, replaceValue )"><span class="secnum">22.1.3.19</span> String.prototype.replace ( <var>searchValue</var>, <var>replaceValue</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-getsubstitution" title="GetSubstitution ( matched, str, position, captures, namedCaptures, replacementTemplate )"><span class="secnum">22.1.3.19.1</span> GetSubstitution ( <var>matched</var>, <var>str</var>, <var>position</var>, <var>captures</var>, <var>namedCaptures</var>, <var>replacementTemplate</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.replaceall" title="String.prototype.replaceAll ( searchValue, replaceValue )"><span class="secnum">22.1.3.20</span> String.prototype.replaceAll ( <var>searchValue</var>, <var>replaceValue</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.search" title="String.prototype.search ( regexp )"><span class="secnum">22.1.3.21</span> String.prototype.search ( <var>regexp</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.slice" title="String.prototype.slice ( start, end )"><span class="secnum">22.1.3.22</span> String.prototype.slice ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.split" title="String.prototype.split ( separator, limit )"><span class="secnum">22.1.3.23</span> String.prototype.split ( <var>separator</var>, <var>limit</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.startswith" title="String.prototype.startsWith ( searchString [ , position ] )"><span class="secnum">22.1.3.24</span> String.prototype.startsWith ( <var>searchString</var> [ , <var>position</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.substring" title="String.prototype.substring ( start, end )"><span class="secnum">22.1.3.25</span> String.prototype.substring ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.tolocalelowercase" title="String.prototype.toLocaleLowerCase ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">22.1.3.26</span> String.prototype.toLocaleLowerCase ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.tolocaleuppercase" title="String.prototype.toLocaleUpperCase ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">22.1.3.27</span> String.prototype.toLocaleUpperCase ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.tolowercase" title="String.prototype.toLowerCase ( )"><span class="secnum">22.1.3.28</span> String.prototype.toLowerCase ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.tostring" title="String.prototype.toString ( )"><span class="secnum">22.1.3.29</span> String.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.touppercase" title="String.prototype.toUpperCase ( )"><span class="secnum">22.1.3.30</span> String.prototype.toUpperCase ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.towellformed" title="String.prototype.toWellFormed ( )"><span class="secnum">22.1.3.31</span> String.prototype.toWellFormed ( )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string.prototype.trim" title="String.prototype.trim ( )"><span class="secnum">22.1.3.32</span> String.prototype.trim ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-trimstring" title="TrimString ( string, where )"><span class="secnum">22.1.3.32.1</span> TrimString ( <var>string</var>, <var>where</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.trimend" title="String.prototype.trimEnd ( )"><span class="secnum">22.1.3.33</span> String.prototype.trimEnd ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype.trimstart" title="String.prototype.trimStart ( )"><span class="secnum">22.1.3.34</span> String.prototype.trimStart ( )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string.prototype.valueof" title="String.prototype.valueOf ( )"><span class="secnum">22.1.3.35</span> String.prototype.valueOf ( )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-thisstringvalue" title="ThisStringValue ( value )"><span class="secnum">22.1.3.35.1</span> ThisStringValue ( <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-string.prototype-%symbol.iterator%" title="String.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">22.1.3.36</span> String.prototype [ %Symbol.iterator% ] ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-string-instances" title="Properties of String Instances"><span class="secnum">22.1.4</span> Properties of String Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-properties-of-string-instances-length" title="length"><span class="secnum">22.1.4.1</span> length</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-string-iterator-objects" title="String Iterator Objects"><span class="secnum">22.1.5</span> String Iterator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-%stringiteratorprototype%-object" title="The %StringIteratorPrototype% Object"><span class="secnum">22.1.5.1</span> The %StringIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-%stringiteratorprototype%.next" title="%StringIteratorPrototype%.next ( )"><span class="secnum">22.1.5.1.1</span> %StringIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-%stringiteratorprototype%-%symbol.tostringtag%" title="%StringIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">22.1.5.1.2</span> %StringIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-patterns" title="Patterns"><span class="secnum">22.2.1</span> Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">22.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-countleftcapturingparenswithin" title="Static Semantics: CountLeftCapturingParensWithin ( node )"><span class="secnum">22.2.1.2</span> SS: CountLeftCapturingParensWithin ( <var>node</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-countleftcapturingparensbefore" title="Static Semantics: CountLeftCapturingParensBefore ( node )"><span class="secnum">22.2.1.3</span> SS: CountLeftCapturingParensBefore ( <var>node</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-mightbothparticipate" title="Static Semantics: MightBothParticipate ( x, y )"><span class="secnum">22.2.1.4</span> SS: MightBothParticipate ( <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-patterns-static-semantics-capturing-group-number" title="Static Semantics: CapturingGroupNumber"><span class="secnum">22.2.1.5</span> SS: CapturingGroupNumber</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-patterns-static-semantics-is-character-class" title="Static Semantics: IsCharacterClass"><span class="secnum">22.2.1.6</span> SS: IsCharacterClass</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-patterns-static-semantics-character-value" title="Static Semantics: CharacterValue"><span class="secnum">22.2.1.7</span> SS: CharacterValue</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-static-semantics-maycontainstrings" title="Static Semantics: MayContainStrings"><span class="secnum">22.2.1.8</span> SS: MayContainStrings</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-groupspecifiersthatmatch" title="Static Semantics: GroupSpecifiersThatMatch ( thisGroupName )"><span class="secnum">22.2.1.9</span> SS: GroupSpecifiersThatMatch ( <var>thisGroupName</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-static-semantics-capturinggroupname" title="Static Semantics: CapturingGroupName"><span class="secnum">22.2.1.10</span> SS: CapturingGroupName</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpidentifiercodepoints" title="Static Semantics: RegExpIdentifierCodePoints"><span class="secnum">22.2.1.11</span> SS: RegExpIdentifierCodePoints</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpidentifiercodepoint" title="Static Semantics: RegExpIdentifierCodePoint"><span class="secnum">22.2.1.12</span> SS: RegExpIdentifierCodePoint</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-pattern-semantics" title="Pattern Semantics"><span class="secnum">22.2.2</span> Pattern Semantics</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-pattern-notation" title="Notation"><span class="secnum">22.2.2.1</span> Notation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp-records" title="RegExp Records"><span class="secnum">22.2.2.1.1</span> RegExp Records</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-compilepattern" title="Runtime Semantics: CompilePattern"><span class="secnum">22.2.2.2</span> RS: CompilePattern</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-compilesubpattern" title="Runtime Semantics: CompileSubpattern"><span class="secnum">22.2.2.3</span> RS: CompileSubpattern</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-repeatmatcher-abstract-operation" title="RepeatMatcher ( m, min, max, greedy, x, c, parenIndex, parenCount )"><span class="secnum">22.2.2.3.1</span> RepeatMatcher ( <var>m</var>, <var>min</var>, <var>max</var>, <var>greedy</var>, <var>x</var>, <var>c</var>, <var>parenIndex</var>, <var>parenCount</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-emptymatcher" title="EmptyMatcher ( )"><span class="secnum">22.2.2.3.2</span> EmptyMatcher ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-matchtwoalternatives" title="MatchTwoAlternatives ( m1, m2 )"><span class="secnum">22.2.2.3.3</span> MatchTwoAlternatives ( <var>m1</var>, <var>m2</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-matchsequence" title="MatchSequence ( m1, m2, direction )"><span class="secnum">22.2.2.3.4</span> MatchSequence ( <var>m1</var>, <var>m2</var>, <var>direction</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-compileassertion" title="Runtime Semantics: CompileAssertion"><span class="secnum">22.2.2.4</span> RS: CompileAssertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-iswordchar-abstract-operation" title="IsWordChar ( rer, Input, e )"><span class="secnum">22.2.2.4.1</span> IsWordChar ( <var>rer</var>, <var>Input</var>, <var>e</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-compilequantifier" title="Runtime Semantics: CompileQuantifier"><span class="secnum">22.2.2.5</span> RS: CompileQuantifier</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-compilequantifierprefix" title="Runtime Semantics: CompileQuantifierPrefix"><span class="secnum">22.2.2.6</span> RS: CompileQuantifierPrefix</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-compileatom" title="Runtime Semantics: CompileAtom"><span class="secnum">22.2.2.7</span> RS: CompileAtom</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-charactersetmatcher-abstract-operation" title="CharacterSetMatcher ( rer, A, invert, direction )"><span class="secnum">22.2.2.7.1</span> CharacterSetMatcher ( <var>rer</var>, <var>A</var>, <var>invert</var>, <var>direction</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-backreference-matcher" title="BackreferenceMatcher ( rer, ns, direction )"><span class="secnum">22.2.2.7.2</span> BackreferenceMatcher ( <var>rer</var>, <var>ns</var>, <var>direction</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-canonicalize-ch" title="Canonicalize ( rer, ch )"><span class="secnum">22.2.2.7.3</span> Canonicalize ( <var>rer</var>, <var>ch</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-updatemodifiers" title="UpdateModifiers ( rer, add, remove )"><span class="secnum">22.2.2.7.4</span> UpdateModifiers ( <var>rer</var>, <var>add</var>, <var>remove</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-compilecharacterclass" title="Runtime Semantics: CompileCharacterClass"><span class="secnum">22.2.2.8</span> RS: CompileCharacterClass</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-compiletocharset" title="Runtime Semantics: CompileToCharSet"><span class="secnum">22.2.2.9</span> RS: CompileToCharSet</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-characterrange-abstract-operation" title="CharacterRange ( A, B )"><span class="secnum">22.2.2.9.1</span> CharacterRange ( <var>A</var>, <var>B</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-haseitherunicodeflag-abstract-operation" title="HasEitherUnicodeFlag ( rer )"><span class="secnum">22.2.2.9.2</span> HasEitherUnicodeFlag ( <var>rer</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-wordcharacters" title="WordCharacters ( rer )"><span class="secnum">22.2.2.9.3</span> WordCharacters ( <var>rer</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-allcharacters" title="AllCharacters ( rer )"><span class="secnum">22.2.2.9.4</span> AllCharacters ( <var>rer</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-maybesimplecasefolding" title="MaybeSimpleCaseFolding ( rer, A )"><span class="secnum">22.2.2.9.5</span> MaybeSimpleCaseFolding ( <var>rer</var>, <var>A</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-charactercomplement" title="CharacterComplement ( rer, S )"><span class="secnum">22.2.2.9.6</span> CharacterComplement ( <var>rer</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-unicodematchproperty-p" title="UnicodeMatchProperty ( rer, p )"><span class="secnum">22.2.2.9.7</span> UnicodeMatchProperty ( <var>rer</var>, <var>p</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-runtime-semantics-unicodematchpropertyvalue-p-v" title="UnicodeMatchPropertyValue ( p, v )"><span class="secnum">22.2.2.9.8</span> UnicodeMatchPropertyValue ( <var>p</var>, <var>v</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-compileclasssetstring" title="Runtime Semantics: CompileClassSetString"><span class="secnum">22.2.2.10</span> RS: CompileClassSetString</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-abstract-operations-for-regexp-creation" title="Abstract Operations for RegExp Creation"><span class="secnum">22.2.3</span> Abstract Operations for RegExp Creation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpcreate" title="RegExpCreate ( P, F )"><span class="secnum">22.2.3.1</span> RegExpCreate ( <var>P</var>, <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpalloc" title="RegExpAlloc ( newTarget )"><span class="secnum">22.2.3.2</span> RegExpAlloc ( <var>newTarget</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpinitialize" title="RegExpInitialize ( obj, pattern, flags )"><span class="secnum">22.2.3.3</span> RegExpInitialize ( <var>obj</var>, <var>pattern</var>, <var>flags</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-parsepattern" title="Static Semantics: ParsePattern ( patternText, u, v )"><span class="secnum">22.2.3.4</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-regexp-constructor" title="The RegExp Constructor"><span class="secnum">22.2.4</span> The RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp-pattern-flags" title="RegExp ( pattern, flags )"><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="text-processing.html#sec-regexp.escape" title="RegExp.escape ( S )"><span class="secnum">22.2.5.1</span> RegExp.escape ( <var>S</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-encodeforregexpescape" title="EncodeForRegExpEscape ( cp )"><span class="secnum">22.2.5.1.1</span> EncodeForRegExpEscape ( <var>cp</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype" title="RegExp.prototype"><span class="secnum">22.2.5.2</span> RegExp.prototype</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp-%symbol.species%" title="get RegExp [ %Symbol.species% ]"><span class="secnum">22.2.5.3</span> get RegExp [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype.constructor" title="RegExp.prototype.constructor"><span class="secnum">22.2.6.1</span> RegExp.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype.exec" title="RegExp.prototype.exec ( string )"><span class="secnum">22.2.6.2</span> RegExp.prototype.exec ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.dotAll" title="get RegExp.prototype.dotAll"><span class="secnum">22.2.6.3</span> get RegExp.prototype.dotAll</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-get-regexp.prototype.flags" title="get RegExp.prototype.flags"><span class="secnum">22.2.6.4</span> get RegExp.prototype.flags</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexphasflag" title="RegExpHasFlag ( R, codeUnit )"><span class="secnum">22.2.6.4.1</span> RegExpHasFlag ( <var>R</var>, <var>codeUnit</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.global" title="get RegExp.prototype.global"><span class="secnum">22.2.6.5</span> get RegExp.prototype.global</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.hasIndices" title="get RegExp.prototype.hasIndices"><span class="secnum">22.2.6.6</span> get RegExp.prototype.hasIndices</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.ignorecase" title="get RegExp.prototype.ignoreCase"><span class="secnum">22.2.6.7</span> get RegExp.prototype.ignoreCase</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype-%symbol.match%" title="RegExp.prototype [ %Symbol.match% ] ( string )"><span class="secnum">22.2.6.8</span> RegExp.prototype [ %Symbol.match% ] ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp-prototype-%symbol.matchall%" title="RegExp.prototype [ %Symbol.matchAll% ] ( string )"><span class="secnum">22.2.6.9</span> RegExp.prototype [ %Symbol.matchAll% ] ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.multiline" title="get RegExp.prototype.multiline"><span class="secnum">22.2.6.10</span> get RegExp.prototype.multiline</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype-%symbol.replace%" title="RegExp.prototype [ %Symbol.replace% ] ( string, replaceValue )"><span class="secnum">22.2.6.11</span> RegExp.prototype [ %Symbol.replace% ] ( <var>string</var>, <var>replaceValue</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype-%symbol.search%" title="RegExp.prototype [ %Symbol.search% ] ( string )"><span class="secnum">22.2.6.12</span> RegExp.prototype [ %Symbol.search% ] ( <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-get-regexp.prototype.source" title="get RegExp.prototype.source"><span class="secnum">22.2.6.13</span> get RegExp.prototype.source</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-escaperegexppattern" title="EscapeRegExpPattern ( P, F )"><span class="secnum">22.2.6.13.1</span> EscapeRegExpPattern ( <var>P</var>, <var>F</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype-%symbol.split%" title="RegExp.prototype [ %Symbol.split% ] ( string, limit )"><span class="secnum">22.2.6.14</span> RegExp.prototype [ %Symbol.split% ] ( <var>string</var>, <var>limit</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.sticky" title="get RegExp.prototype.sticky"><span class="secnum">22.2.6.15</span> get RegExp.prototype.sticky</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype.test" title="RegExp.prototype.test ( S )"><span class="secnum">22.2.6.16</span> RegExp.prototype.test ( <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexp.prototype.tostring" title="RegExp.prototype.toString ( )"><span class="secnum">22.2.6.17</span> RegExp.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.unicode" title="get RegExp.prototype.unicode"><span class="secnum">22.2.6.18</span> get RegExp.prototype.unicode</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-get-regexp.prototype.unicodesets" title="get RegExp.prototype.unicodeSets"><span class="secnum">22.2.6.19</span> get RegExp.prototype.unicodeSets</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-abstract-operations-for-regexp-matching" title="Abstract Operations for RegExp Matching"><span class="secnum">22.2.7</span> Abstract Operations for RegExp Matching</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpexec" title="RegExpExec ( R, S )"><span class="secnum">22.2.7.1</span> RegExpExec ( <var>R</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-regexpbuiltinexec" title="RegExpBuiltinExec ( R, S )"><span class="secnum">22.2.7.2</span> RegExpBuiltinExec ( <var>R</var>, <var>S</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-advancestringindex" title="AdvanceStringIndex ( S, index, unicode )"><span class="secnum">22.2.7.3</span> AdvanceStringIndex ( <var>S</var>, <var>index</var>, <var>unicode</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-getstringindex" title="GetStringIndex ( S, codePointIndex )"><span class="secnum">22.2.7.4</span> GetStringIndex ( <var>S</var>, <var>codePointIndex</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-match-records" title="Match Records"><span class="secnum">22.2.7.5</span> Match Records</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-getmatchstring" title="GetMatchString ( S, match )"><span class="secnum">22.2.7.6</span> GetMatchString ( <var>S</var>, <var>match</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-getmatchindexpair" title="GetMatchIndexPair ( S, match )"><span class="secnum">22.2.7.7</span> GetMatchIndexPair ( <var>S</var>, <var>match</var> )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-makematchindicesindexpairarray" title="MakeMatchIndicesIndexPairArray ( S, indices, groupNames, hasGroups )"><span class="secnum">22.2.7.8</span> MakeMatchIndicesIndexPairArray ( <var>S</var>, <var>indices</var>, <var>groupNames</var>, <var>hasGroups</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-properties-of-regexp-instances" title="Properties of RegExp Instances"><span class="secnum">22.2.8</span> Properties of RegExp Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-lastindex" title="lastIndex"><span class="secnum">22.2.8.1</span> lastIndex</a></li></ol></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-regexp-string-iterator-objects" title="RegExp String Iterator Objects"><span class="secnum">22.2.9</span> RegExp String Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-createregexpstringiterator" title="CreateRegExpStringIterator ( R, S, global, fullUnicode )"><span class="secnum">22.2.9.1</span> CreateRegExpStringIterator ( <var>R</var>, <var>S</var>, <var>global</var>, <var>fullUnicode</var> )</a></li><li><span class="item-toggle">+</span><a href="text-processing.html#sec-%regexpstringiteratorprototype%-object" title="The %RegExpStringIteratorPrototype% Object"><span class="secnum">22.2.9.2</span> The %RegExpStringIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-%regexpstringiteratorprototype%.next" title="%RegExpStringIteratorPrototype%.next ( )"><span class="secnum">22.2.9.2.1</span> %RegExpStringIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-%regexpstringiteratorprototype%-%symbol.tostringtag%" title="%RegExpStringIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">22.2.9.2.2</span> %RegExpStringIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="text-processing.html#sec-properties-of-regexp-string-iterator-instances" title="Properties of RegExp String Iterator Instances"><span class="secnum">22.2.9.3</span> Properties of RegExp String Iterator Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array-constructor" title="The Array Constructor"><span class="secnum">23.1.1</span> The Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array" title="Array ( ...values )"><span class="secnum">23.1.1.1</span> Array ( ...<var>values</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.2</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.from" title="Array.from ( items [ , mapper [ , thisArg ] ] )"><span class="secnum">23.1.2.1</span> Array.from ( <var>items</var> [ , <var>mapper</var> [ , <var>thisArg</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.fromasync" title="Array.fromAsync ( items [ , mapper [ , thisArg ] ] )"><span class="secnum">23.1.2.2</span> Array.fromAsync ( <var>items</var> [ , <var>mapper</var> [ , <var>thisArg</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.isarray" title="Array.isArray ( arg )"><span class="secnum">23.1.2.3</span> Array.isArray ( <var>arg</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.of" title="Array.of ( ...items )"><span class="secnum">23.1.2.4</span> Array.of ( ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype" title="Array.prototype"><span class="secnum">23.1.2.5</span> Array.prototype</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-array-%symbol.species%" title="get Array [ %Symbol.species% ]"><span class="secnum">23.1.2.6</span> get Array [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-the-array-prototype-object" title="Properties of the Array Prototype Object"><span class="secnum">23.1.3</span> Properties of the Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.at" title="Array.prototype.at ( index )"><span class="secnum">23.1.3.1</span> Array.prototype.at ( <var>index</var> )</a></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array.prototype.concat" title="Array.prototype.concat ( ...items )"><span class="secnum">23.1.3.2</span> Array.prototype.concat ( ...<var>items</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-isconcatspreadable" title="IsConcatSpreadable ( O )"><span class="secnum">23.1.3.2.1</span> IsConcatSpreadable ( <var>O</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.constructor" title="Array.prototype.constructor"><span class="secnum">23.1.3.3</span> Array.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.copywithin" title="Array.prototype.copyWithin ( target, start [ , end ] )"><span class="secnum">23.1.3.4</span> Array.prototype.copyWithin ( <var>target</var>, <var>start</var> [ , <var>end</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.entries" title="Array.prototype.entries ( )"><span class="secnum">23.1.3.5</span> Array.prototype.entries ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.every" title="Array.prototype.every ( callback [ , thisArg ] )"><span class="secnum">23.1.3.6</span> Array.prototype.every ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.fill" title="Array.prototype.fill ( value [ , start [ , end ] ] )"><span class="secnum">23.1.3.7</span> Array.prototype.fill ( <var>value</var> [ , <var>start</var> [ , <var>end</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.filter" title="Array.prototype.filter ( callback [ , thisArg ] )"><span class="secnum">23.1.3.8</span> Array.prototype.filter ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.find" title="Array.prototype.find ( predicate [ , thisArg ] )"><span class="secnum">23.1.3.9</span> Array.prototype.find ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.findindex" title="Array.prototype.findIndex ( predicate [ , thisArg ] )"><span class="secnum">23.1.3.10</span> Array.prototype.findIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.findlast" title="Array.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">23.1.3.11</span> Array.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array.prototype.findlastindex" title="Array.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">23.1.3.12</span> Array.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-findviapredicate" title="FindViaPredicate ( O, len, direction, predicate, thisArg )"><span class="secnum">23.1.3.12.1</span> FindViaPredicate ( <var>O</var>, <var>len</var>, <var>direction</var>, <var>predicate</var>, <var>thisArg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array.prototype.flat" title="Array.prototype.flat ( [ depth ] )"><span class="secnum">23.1.3.13</span> Array.prototype.flat ( [ <var>depth</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-flattenintoarray" title="FlattenIntoArray ( target, source, sourceLen, start, depth [ , mapperFunction [ , thisArg ] ] )"><span class="secnum">23.1.3.13.1</span> FlattenIntoArray ( <var>target</var>, <var>source</var>, <var>sourceLen</var>, <var>start</var>, <var>depth</var> [ , <var>mapperFunction</var> [ , <var>thisArg</var> ] ] )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.flatmap" title="Array.prototype.flatMap ( mapperFunction [ , thisArg ] )"><span class="secnum">23.1.3.14</span> Array.prototype.flatMap ( <var>mapperFunction</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.foreach" title="Array.prototype.forEach ( callback [ , thisArg ] )"><span class="secnum">23.1.3.15</span> Array.prototype.forEach ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.includes" title="Array.prototype.includes ( searchElement [ , fromIndex ] )"><span class="secnum">23.1.3.16</span> Array.prototype.includes ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.indexof" title="Array.prototype.indexOf ( searchElement [ , fromIndex ] )"><span class="secnum">23.1.3.17</span> Array.prototype.indexOf ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.join" title="Array.prototype.join ( separator )"><span class="secnum">23.1.3.18</span> Array.prototype.join ( <var>separator</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.keys" title="Array.prototype.keys ( )"><span class="secnum">23.1.3.19</span> Array.prototype.keys ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.lastindexof" title="Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )"><span class="secnum">23.1.3.20</span> Array.prototype.lastIndexOf ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.map" title="Array.prototype.map ( callback [ , thisArg ] )"><span class="secnum">23.1.3.21</span> Array.prototype.map ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.pop" title="Array.prototype.pop ( )"><span class="secnum">23.1.3.22</span> Array.prototype.pop ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.push" title="Array.prototype.push ( ...items )"><span class="secnum">23.1.3.23</span> Array.prototype.push ( ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.reduce" title="Array.prototype.reduce ( callback [ , initialValue ] )"><span class="secnum">23.1.3.24</span> Array.prototype.reduce ( <var>callback</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.reduceright" title="Array.prototype.reduceRight ( callback [ , initialValue ] )"><span class="secnum">23.1.3.25</span> Array.prototype.reduceRight ( <var>callback</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.reverse" title="Array.prototype.reverse ( )"><span class="secnum">23.1.3.26</span> Array.prototype.reverse ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.shift" title="Array.prototype.shift ( )"><span class="secnum">23.1.3.27</span> Array.prototype.shift ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.slice" title="Array.prototype.slice ( start, end )"><span class="secnum">23.1.3.28</span> Array.prototype.slice ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.some" title="Array.prototype.some ( callback [ , thisArg ] )"><span class="secnum">23.1.3.29</span> Array.prototype.some ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array.prototype.sort" title="Array.prototype.sort ( comparator )"><span class="secnum">23.1.3.30</span> Array.prototype.sort ( <var>comparator</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-sortindexedproperties" title="SortIndexedProperties ( obj, len, SortCompare, holes )"><span class="secnum">23.1.3.30.1</span> SortIndexedProperties ( <var>obj</var>, <var>len</var>, <var>SortCompare</var>, <var>holes</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-comparearrayelements" title="CompareArrayElements ( x, y, comparator )"><span class="secnum">23.1.3.30.2</span> CompareArrayElements ( <var>x</var>, <var>y</var>, <var>comparator</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.splice" title="Array.prototype.splice ( start, deleteCount, ...items )"><span class="secnum">23.1.3.31</span> Array.prototype.splice ( <var>start</var>, <var>deleteCount</var>, ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.tolocalestring" title="Array.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">23.1.3.32</span> Array.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.toreversed" title="Array.prototype.toReversed ( )"><span class="secnum">23.1.3.33</span> Array.prototype.toReversed ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.tosorted" title="Array.prototype.toSorted ( comparator )"><span class="secnum">23.1.3.34</span> Array.prototype.toSorted ( <var>comparator</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.tospliced" title="Array.prototype.toSpliced ( start, skipCount, ...items )"><span class="secnum">23.1.3.35</span> Array.prototype.toSpliced ( <var>start</var>, <var>skipCount</var>, ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.tostring" title="Array.prototype.toString ( )"><span class="secnum">23.1.3.36</span> Array.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.unshift" title="Array.prototype.unshift ( ...items )"><span class="secnum">23.1.3.37</span> Array.prototype.unshift ( ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.values" title="Array.prototype.values ( )"><span class="secnum">23.1.3.38</span> Array.prototype.values ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype.with" title="Array.prototype.with ( index, value )"><span class="secnum">23.1.3.39</span> Array.prototype.with ( <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype-%symbol.iterator%" title="Array.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">23.1.3.40</span> Array.prototype [ %Symbol.iterator% ] ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-array.prototype-%symbol.unscopables%" title="Array.prototype [ %Symbol.unscopables% ]"><span class="secnum">23.1.3.41</span> Array.prototype [ %Symbol.unscopables% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-array-instances" title="Properties of Array Instances"><span class="secnum">23.1.4</span> Properties of Array Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-properties-of-array-instances-length" title="length"><span class="secnum">23.1.4.1</span> length</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-array-iterator-objects" title="Array Iterator Objects"><span class="secnum">23.1.5</span> Array Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-createarrayiterator" title="CreateArrayIterator ( array, kind )"><span class="secnum">23.1.5.1</span> CreateArrayIterator ( <var>array</var>, <var>kind</var> )</a></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-%arrayiteratorprototype%-object" title="The %ArrayIteratorPrototype% Object"><span class="secnum">23.1.5.2</span> The %ArrayIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%arrayiteratorprototype%.next" title="%ArrayIteratorPrototype%.next ( )"><span class="secnum">23.1.5.2.1</span> %ArrayIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%arrayiteratorprototype%-%symbol.tostringtag%" title="%ArrayIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">23.1.5.2.2</span> %ArrayIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-properties-of-array-iterator-instances" title="Properties of Array Iterator Instances"><span class="secnum">23.1.5.3</span> Properties of Array Iterator Instances</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-%typedarray%-intrinsic-object" title="The %TypedArray% Intrinsic Object"><span class="secnum">23.2.1</span> The %TypedArray% Intrinsic Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%" title="%TypedArray% ( )"><span class="secnum">23.2.1.1</span> %TypedArray% ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-the-%typedarray%-intrinsic-object" title="Properties of the %TypedArray% Intrinsic Object"><span class="secnum">23.2.2</span> Properties of the %TypedArray% Intrinsic Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.from" title="%TypedArray%.from ( source [ , mapper [ , thisArg ] ] )"><span class="secnum">23.2.2.1</span> %TypedArray%.from ( <var>source</var> [ , <var>mapper</var> [ , <var>thisArg</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.of" title="%TypedArray%.of ( ...items )"><span class="secnum">23.2.2.2</span> %TypedArray%.of ( ...<var>items</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype" title="%TypedArray%.prototype"><span class="secnum">23.2.2.3</span> %TypedArray%.prototype</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%-%symbol.species%" title="get %TypedArray% [ %Symbol.species% ]"><span class="secnum">23.2.2.4</span> get %TypedArray% [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-the-%typedarrayprototype%-object" title="Properties of the %TypedArray% Prototype Object"><span class="secnum">23.2.3</span> Properties of the %TypedArray% Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.at" title="%TypedArray%.prototype.at ( index )"><span class="secnum">23.2.3.1</span> %TypedArray%.prototype.at ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%.prototype.buffer" title="get %TypedArray%.prototype.buffer"><span class="secnum">23.2.3.2</span> get %TypedArray%.prototype.buffer</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%.prototype.bytelength" title="get %TypedArray%.prototype.byteLength"><span class="secnum">23.2.3.3</span> get %TypedArray%.prototype.byteLength</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%.prototype.byteoffset" title="get %TypedArray%.prototype.byteOffset"><span class="secnum">23.2.3.4</span> get %TypedArray%.prototype.byteOffset</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.constructor" title="%TypedArray%.prototype.constructor"><span class="secnum">23.2.3.5</span> %TypedArray%.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.copywithin" title="%TypedArray%.prototype.copyWithin ( target, start [ , end ] )"><span class="secnum">23.2.3.6</span> %TypedArray%.prototype.copyWithin ( <var>target</var>, <var>start</var> [ , <var>end</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.entries" title="%TypedArray%.prototype.entries ( )"><span class="secnum">23.2.3.7</span> %TypedArray%.prototype.entries ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.every" title="%TypedArray%.prototype.every ( callback [ , thisArg ] )"><span class="secnum">23.2.3.8</span> %TypedArray%.prototype.every ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.fill" title="%TypedArray%.prototype.fill ( value [ , start [ , end ] ] )"><span class="secnum">23.2.3.9</span> %TypedArray%.prototype.fill ( <var>value</var> [ , <var>start</var> [ , <var>end</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.filter" title="%TypedArray%.prototype.filter ( callback [ , thisArg ] )"><span class="secnum">23.2.3.10</span> %TypedArray%.prototype.filter ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.find" title="%TypedArray%.prototype.find ( predicate [ , thisArg ] )"><span class="secnum">23.2.3.11</span> %TypedArray%.prototype.find ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.findindex" title="%TypedArray%.prototype.findIndex ( predicate [ , thisArg ] )"><span class="secnum">23.2.3.12</span> %TypedArray%.prototype.findIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.findlast" title="%TypedArray%.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">23.2.3.13</span> %TypedArray%.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.findlastindex" title="%TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">23.2.3.14</span> %TypedArray%.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.foreach" title="%TypedArray%.prototype.forEach ( callback [ , thisArg ] )"><span class="secnum">23.2.3.15</span> %TypedArray%.prototype.forEach ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.includes" title="%TypedArray%.prototype.includes ( searchElement [ , fromIndex ] )"><span class="secnum">23.2.3.16</span> %TypedArray%.prototype.includes ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.indexof" title="%TypedArray%.prototype.indexOf ( searchElement [ , fromIndex ] )"><span class="secnum">23.2.3.17</span> %TypedArray%.prototype.indexOf ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.join" title="%TypedArray%.prototype.join ( separator )"><span class="secnum">23.2.3.18</span> %TypedArray%.prototype.join ( <var>separator</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.keys" title="%TypedArray%.prototype.keys ( )"><span class="secnum">23.2.3.19</span> %TypedArray%.prototype.keys ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.lastindexof" title="%TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] )"><span class="secnum">23.2.3.20</span> %TypedArray%.prototype.lastIndexOf ( <var>searchElement</var> [ , <var>fromIndex</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%.prototype.length" title="get %TypedArray%.prototype.length"><span class="secnum">23.2.3.21</span> get %TypedArray%.prototype.length</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.map" title="%TypedArray%.prototype.map ( callback [ , thisArg ] )"><span class="secnum">23.2.3.22</span> %TypedArray%.prototype.map ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.reduce" title="%TypedArray%.prototype.reduce ( callback [ , initialValue ] )"><span class="secnum">23.2.3.23</span> %TypedArray%.prototype.reduce ( <var>callback</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.reduceright" title="%TypedArray%.prototype.reduceRight ( callback [ , initialValue ] )"><span class="secnum">23.2.3.24</span> %TypedArray%.prototype.reduceRight ( <var>callback</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.reverse" title="%TypedArray%.prototype.reverse ( )"><span class="secnum">23.2.3.25</span> %TypedArray%.prototype.reverse ( )</a></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-%typedarray%.prototype.set" title="%TypedArray%.prototype.set ( source [ , offset ] )"><span class="secnum">23.2.3.26</span> %TypedArray%.prototype.set ( <var>source</var> [ , <var>offset</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-settypedarrayfromarraylike" title="SetTypedArrayFromArrayLike ( target, targetOffset, source )"><span class="secnum">23.2.3.26.1</span> SetTypedArrayFromArrayLike ( <var>target</var>, <var>targetOffset</var>, <var>source</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-settypedarrayfromtypedarray" title="SetTypedArrayFromTypedArray ( target, targetOffset, source )"><span class="secnum">23.2.3.26.2</span> SetTypedArrayFromTypedArray ( <var>target</var>, <var>targetOffset</var>, <var>source</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.slice" title="%TypedArray%.prototype.slice ( start, end )"><span class="secnum">23.2.3.27</span> %TypedArray%.prototype.slice ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.some" title="%TypedArray%.prototype.some ( callback [ , thisArg ] )"><span class="secnum">23.2.3.28</span> %TypedArray%.prototype.some ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.sort" title="%TypedArray%.prototype.sort ( comparator )"><span class="secnum">23.2.3.29</span> %TypedArray%.prototype.sort ( <var>comparator</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.subarray" title="%TypedArray%.prototype.subarray ( start, end )"><span class="secnum">23.2.3.30</span> %TypedArray%.prototype.subarray ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.tolocalestring" title="%TypedArray%.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )"><span class="secnum">23.2.3.31</span> %TypedArray%.prototype.toLocaleString ( [ <var>reserved1</var> [ , <var>reserved2</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.toreversed" title="%TypedArray%.prototype.toReversed ( )"><span class="secnum">23.2.3.32</span> %TypedArray%.prototype.toReversed ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.tosorted" title="%TypedArray%.prototype.toSorted ( comparator )"><span class="secnum">23.2.3.33</span> %TypedArray%.prototype.toSorted ( <var>comparator</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.tostring" title="%TypedArray%.prototype.toString ( )"><span class="secnum">23.2.3.34</span> %TypedArray%.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.values" title="%TypedArray%.prototype.values ( )"><span class="secnum">23.2.3.35</span> %TypedArray%.prototype.values ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype.with" title="%TypedArray%.prototype.with ( index, value )"><span class="secnum">23.2.3.36</span> %TypedArray%.prototype.with ( <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-%typedarray%.prototype-%symbol.iterator%" title="%TypedArray%.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">23.2.3.37</span> %TypedArray%.prototype [ %Symbol.iterator% ] ( )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-get-%typedarray%.prototype-%symbol.tostringtag%" title="get %TypedArray%.prototype [ %Symbol.toStringTag% ]"><span class="secnum">23.2.3.38</span> get %TypedArray%.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-abstract-operations-for-typedarray-objects" title="Abstract Operations for TypedArray Objects"><span class="secnum">23.2.4</span> Abstract Operations for TypedArray Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarraycreatefromconstructor" title="TypedArrayCreateFromConstructor ( constructor, argumentList )"><span class="secnum">23.2.4.1</span> TypedArrayCreateFromConstructor ( <var>constructor</var>, <var>argumentList</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarray-create-same-type" title="TypedArrayCreateSameType ( exemplar, length )"><span class="secnum">23.2.4.2</span> TypedArrayCreateSameType ( <var>exemplar</var>, <var>length</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#typedarray-species-create" title="TypedArraySpeciesCreate ( exemplar, argumentList )"><span class="secnum">23.2.4.3</span> TypedArraySpeciesCreate ( <var>exemplar</var>, <var>argumentList</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-validatetypedarray" title="ValidateTypedArray ( O, order )"><span class="secnum">23.2.4.4</span> ValidateTypedArray ( <var>O</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarrayelementsize" title="TypedArrayElementSize ( O )"><span class="secnum">23.2.4.5</span> TypedArrayElementSize ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarrayelementtype" title="TypedArrayElementType ( O )"><span class="secnum">23.2.4.6</span> TypedArrayElementType ( <var>O</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-comparetypedarrayelements" title="CompareTypedArrayElements ( x, y, comparator )"><span class="secnum">23.2.4.7</span> CompareTypedArrayElements ( <var>x</var>, <var>y</var>, <var>comparator</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-typedarray-constructors" title="The TypedArray Constructors"><span class="secnum">23.2.5</span> The <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-typedarray" title="TypedArray ( ...args )"><span class="secnum">23.2.5.1</span> <var>TypedArray</var> ( ...<var>args</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-allocatetypedarray" title="AllocateTypedArray ( constructorName, newTarget, defaultProto [ , length ] )"><span class="secnum">23.2.5.1.1</span> AllocateTypedArray ( <var>constructorName</var>, <var>newTarget</var>, <var>defaultProto</var> [ , <var>length</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-initializetypedarrayfromtypedarray" title="InitializeTypedArrayFromTypedArray ( O, srcArray )"><span class="secnum">23.2.5.1.2</span> InitializeTypedArrayFromTypedArray ( <var>O</var>, <var>srcArray</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-initializetypedarrayfromarraybuffer" title="InitializeTypedArrayFromArrayBuffer ( O, buffer, byteOffset, length )"><span class="secnum">23.2.5.1.3</span> InitializeTypedArrayFromArrayBuffer ( <var>O</var>, <var>buffer</var>, <var>byteOffset</var>, <var>length</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-initializetypedarrayfromlist" title="InitializeTypedArrayFromList ( O, values )"><span class="secnum">23.2.5.1.4</span> InitializeTypedArrayFromList ( <var>O</var>, <var>values</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-initializetypedarrayfromarraylike" title="InitializeTypedArrayFromArrayLike ( O, arrayLike )"><span class="secnum">23.2.5.1.5</span> InitializeTypedArrayFromArrayLike ( <var>O</var>, <var>arrayLike</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-allocatetypedarraybuffer" title="AllocateTypedArrayBuffer ( O, length )"><span class="secnum">23.2.5.1.6</span> AllocateTypedArrayBuffer ( <var>O</var>, <var>length</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarray.bytes_per_element" title="TypedArray.BYTES_PER_ELEMENT"><span class="secnum">23.2.6.1</span> <var>TypedArray</var>.BYTES_PER_ELEMENT</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarray.prototype" title="TypedArray.prototype"><span class="secnum">23.2.6.2</span> <var>TypedArray</var>.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-properties-of-typedarray-prototype-objects" title="Properties of the TypedArray Prototype Objects"><span class="secnum">23.2.7</span> Properties of the <var>TypedArray</var> Prototype Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarray.prototype.bytes_per_element" title="TypedArray.prototype.BYTES_PER_ELEMENT"><span class="secnum">23.2.7.1</span> <var>TypedArray</var>.prototype.BYTES_PER_ELEMENT</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-typedarray.prototype.constructor" title="TypedArray.prototype.constructor"><span class="secnum">23.2.7.2</span> <var>TypedArray</var>.prototype.constructor</a></li></ol></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-properties-of-typedarray-instances" title="Properties of TypedArray Instances"><span class="secnum">23.2.8</span> Properties of <var>TypedArray</var> Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-uint8array" title="Uint8Array Objects"><span class="secnum">23.3</span> Uint8Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-additional-properties-of-the-uint8array-constructor" title="Additional Properties of the Uint8Array Constructor"><span class="secnum">23.3.1</span> Additional Properties of the Uint8Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.frombase64" title="Uint8Array.fromBase64 ( string [ , options ] )"><span class="secnum">23.3.1.1</span> Uint8Array.fromBase64 ( <var>string</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.fromhex" title="Uint8Array.fromHex ( string )"><span class="secnum">23.3.1.2</span> Uint8Array.fromHex ( <var>string</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-additional-properties-of-the-uint8array-prototype-object" title="Additional Properties of the Uint8Array Prototype Object"><span class="secnum">23.3.2</span> Additional Properties of the Uint8Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.prototype.setfrombase64" title="Uint8Array.prototype.setFromBase64 ( string [ , options ] )"><span class="secnum">23.3.2.1</span> Uint8Array.prototype.setFromBase64 ( <var>string</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.prototype.setfromhex" title="Uint8Array.prototype.setFromHex ( string )"><span class="secnum">23.3.2.2</span> Uint8Array.prototype.setFromHex ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.prototype.tobase64" title="Uint8Array.prototype.toBase64 ( [ options ] )"><span class="secnum">23.3.2.3</span> Uint8Array.prototype.toBase64 ( [ <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-uint8array.prototype.tohex" title="Uint8Array.prototype.toHex ( )"><span class="secnum">23.3.2.4</span> Uint8Array.prototype.toHex ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="indexed-collections.html#sec-abstract-operations-for-uint8array-objects" title="Abstract Operations for Uint8Array Objects"><span class="secnum">23.3.3</span> Abstract Operations for Uint8Array Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-validateuint8array" title="ValidateUint8Array ( ta )"><span class="secnum">23.3.3.1</span> ValidateUint8Array ( <var>ta</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-getuint8arraybytes" title="GetUint8ArrayBytes ( ta )"><span class="secnum">23.3.3.2</span> GetUint8ArrayBytes ( <var>ta</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-setuint8arraybytes" title="SetUint8ArrayBytes ( into, bytes )"><span class="secnum">23.3.3.3</span> SetUint8ArrayBytes ( <var>into</var>, <var>bytes</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-skipasciiwhitespace" title="SkipAsciiWhitespace ( string, index )"><span class="secnum">23.3.3.4</span> SkipAsciiWhitespace ( <var>string</var>, <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-decodefinalbase64chunk" title="DecodeFinalBase64Chunk ( chunk, throwOnExtraBits )"><span class="secnum">23.3.3.5</span> DecodeFinalBase64Chunk ( <var>chunk</var>, <var>throwOnExtraBits</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-decodefulllengthbase64chunk" title="DecodeFullLengthBase64Chunk ( chunk )"><span class="secnum">23.3.3.6</span> DecodeFullLengthBase64Chunk ( <var>chunk</var> )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-frombase64" title="FromBase64 ( string, alphabet, lastChunkHandling [ , maxLength ] )"><span class="secnum">23.3.3.7</span> FromBase64 ( <var>string</var>, <var>alphabet</var>, <var>lastChunkHandling</var> [ , <var>maxLength</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="indexed-collections.html#sec-fromhex" title="FromHex ( string [ , maxLength ] )"><span class="secnum">23.3.3.8</span> FromHex ( <var>string</var> [ , <var>maxLength</var> ] )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-map-constructor" title="The Map Constructor"><span class="secnum">24.1.1</span> The Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map-iterable" title="Map ( [ iterable ] )"><span class="secnum">24.1.1.1</span> Map ( [ <var>iterable</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-add-entries-from-iterable" title="AddEntriesFromIterable ( target, iterable, adder )"><span class="secnum">24.1.1.2</span> AddEntriesFromIterable ( <var>target</var>, <var>iterable</var>, <var>adder</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.groupby" title="Map.groupBy ( items, callback )"><span class="secnum">24.1.2.1</span> Map.groupBy ( <var>items</var>, <var>callback</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype" title="Map.prototype"><span class="secnum">24.1.2.2</span> Map.prototype</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-get-map-%symbol.species%" title="get Map [ %Symbol.species% ]"><span class="secnum">24.1.2.3</span> get Map [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-map-prototype-object" title="Properties of the Map Prototype Object"><span class="secnum">24.1.3</span> Properties of the Map Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.clear" title="Map.prototype.clear ( )"><span class="secnum">24.1.3.1</span> Map.prototype.clear ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.constructor" title="Map.prototype.constructor"><span class="secnum">24.1.3.2</span> Map.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.delete" title="Map.prototype.delete ( key )"><span class="secnum">24.1.3.3</span> Map.prototype.delete ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.entries" title="Map.prototype.entries ( )"><span class="secnum">24.1.3.4</span> Map.prototype.entries ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.foreach" title="Map.prototype.forEach ( callback [ , thisArg ] )"><span class="secnum">24.1.3.5</span> Map.prototype.forEach ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.get" title="Map.prototype.get ( key )"><span class="secnum">24.1.3.6</span> Map.prototype.get ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.getorinsert" title="Map.prototype.getOrInsert ( key, value )"><span class="secnum">24.1.3.7</span> Map.prototype.getOrInsert ( <var>key</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.getorinsertcomputed" title="Map.prototype.getOrInsertComputed ( key, callback )"><span class="secnum">24.1.3.8</span> Map.prototype.getOrInsertComputed ( <var>key</var>, <var>callback</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.has" title="Map.prototype.has ( key )"><span class="secnum">24.1.3.9</span> Map.prototype.has ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.keys" title="Map.prototype.keys ( )"><span class="secnum">24.1.3.10</span> Map.prototype.keys ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.set" title="Map.prototype.set ( key, value )"><span class="secnum">24.1.3.11</span> Map.prototype.set ( <var>key</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-get-map.prototype.size" title="get Map.prototype.size"><span class="secnum">24.1.3.12</span> get Map.prototype.size</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype.values" title="Map.prototype.values ( )"><span class="secnum">24.1.3.13</span> Map.prototype.values ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype-%symbol.iterator%" title="Map.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">24.1.3.14</span> Map.prototype [ %Symbol.iterator% ] ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-map.prototype-%symbol.tostringtag%" title="Map.prototype [ %Symbol.toStringTag% ]"><span class="secnum">24.1.3.15</span> Map.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-properties-of-map-instances" title="Properties of Map Instances"><span class="secnum">24.1.4</span> Properties of Map Instances</a></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-map-iterator-objects" title="Map Iterator Objects"><span class="secnum">24.1.5</span> Map Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-createmapiterator" title="CreateMapIterator ( map, kind )"><span class="secnum">24.1.5.1</span> CreateMapIterator ( <var>map</var>, <var>kind</var> )</a></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-%mapiteratorprototype%-object" title="The %MapIteratorPrototype% Object"><span class="secnum">24.1.5.2</span> The %MapIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-%mapiteratorprototype%.next" title="%MapIteratorPrototype%.next ( )"><span class="secnum">24.1.5.2.1</span> %MapIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-%mapiteratorprototype%-%symbol.tostringtag%" title="%MapIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">24.1.5.2.2</span> %MapIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-abstract-operations-for-set-objects" title="Abstract Operations For Set Objects"><span class="secnum">24.2.1</span> Abstract Operations For Set Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set-records" title="Set Records"><span class="secnum">24.2.1.1</span> Set Records</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-getsetrecord" title="GetSetRecord ( obj )"><span class="secnum">24.2.1.2</span> GetSetRecord ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-setdatahas" title="SetDataHas ( setData, value )"><span class="secnum">24.2.1.3</span> SetDataHas ( <var>setData</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-setdataindex" title="SetDataIndex ( setData, value )"><span class="secnum">24.2.1.4</span> SetDataIndex ( <var>setData</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-setdatasize" title="SetDataSize ( setData )"><span class="secnum">24.2.1.5</span> SetDataSize ( <var>setData</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-set-constructor" title="The Set Constructor"><span class="secnum">24.2.2</span> The Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set-iterable" title="Set ( [ iterable ] )"><span class="secnum">24.2.2.1</span> Set ( [ <var>iterable</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.3</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype" title="Set.prototype"><span class="secnum">24.2.3.1</span> Set.prototype</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-get-set-%symbol.species%" title="get Set [ %Symbol.species% ]"><span class="secnum">24.2.3.2</span> get Set [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-set-prototype-object" title="Properties of the Set Prototype Object"><span class="secnum">24.2.4</span> Properties of the Set Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.add" title="Set.prototype.add ( value )"><span class="secnum">24.2.4.1</span> Set.prototype.add ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.clear" title="Set.prototype.clear ( )"><span class="secnum">24.2.4.2</span> Set.prototype.clear ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.constructor" title="Set.prototype.constructor"><span class="secnum">24.2.4.3</span> Set.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.delete" title="Set.prototype.delete ( value )"><span class="secnum">24.2.4.4</span> Set.prototype.delete ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.difference" title="Set.prototype.difference ( other )"><span class="secnum">24.2.4.5</span> Set.prototype.difference ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.entries" title="Set.prototype.entries ( )"><span class="secnum">24.2.4.6</span> Set.prototype.entries ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.foreach" title="Set.prototype.forEach ( callback [ , thisArg ] )"><span class="secnum">24.2.4.7</span> Set.prototype.forEach ( <var>callback</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.has" title="Set.prototype.has ( value )"><span class="secnum">24.2.4.8</span> Set.prototype.has ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.intersection" title="Set.prototype.intersection ( other )"><span class="secnum">24.2.4.9</span> Set.prototype.intersection ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.isdisjointfrom" title="Set.prototype.isDisjointFrom ( other )"><span class="secnum">24.2.4.10</span> Set.prototype.isDisjointFrom ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.issubsetof" title="Set.prototype.isSubsetOf ( other )"><span class="secnum">24.2.4.11</span> Set.prototype.isSubsetOf ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.issupersetof" title="Set.prototype.isSupersetOf ( other )"><span class="secnum">24.2.4.12</span> Set.prototype.isSupersetOf ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.keys" title="Set.prototype.keys ( )"><span class="secnum">24.2.4.13</span> Set.prototype.keys ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-get-set.prototype.size" title="get Set.prototype.size"><span class="secnum">24.2.4.14</span> get Set.prototype.size</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.symmetricdifference" title="Set.prototype.symmetricDifference ( other )"><span class="secnum">24.2.4.15</span> Set.prototype.symmetricDifference ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.union" title="Set.prototype.union ( other )"><span class="secnum">24.2.4.16</span> Set.prototype.union ( <var>other</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype.values" title="Set.prototype.values ( )"><span class="secnum">24.2.4.17</span> Set.prototype.values ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype-%symbol.iterator%" title="Set.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">24.2.4.18</span> Set.prototype [ %Symbol.iterator% ] ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-set.prototype-%symbol.tostringtag%" title="Set.prototype [ %Symbol.toStringTag% ]"><span class="secnum">24.2.4.19</span> Set.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-properties-of-set-instances" title="Properties of Set Instances"><span class="secnum">24.2.5</span> Properties of Set Instances</a></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-set-iterator-objects" title="Set Iterator Objects"><span class="secnum">24.2.6</span> Set Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-createsetiterator" title="CreateSetIterator ( set, kind )"><span class="secnum">24.2.6.1</span> CreateSetIterator ( <var>set</var>, <var>kind</var> )</a></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-%setiteratorprototype%-object" title="The %SetIteratorPrototype% Object"><span class="secnum">24.2.6.2</span> The %SetIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-%setiteratorprototype%.next" title="%SetIteratorPrototype%.next ( )"><span class="secnum">24.2.6.2.1</span> %SetIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-%setiteratorprototype%-%symbol.tostringtag%" title="%SetIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">24.2.6.2.2</span> %SetIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-weakmap-constructor" title="The WeakMap Constructor"><span class="secnum">24.3.1</span> The WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap-iterable" title="WeakMap ( [ iterable ] )"><span class="secnum">24.3.1.1</span> WeakMap ( [ <var>iterable</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype" title="WeakMap.prototype"><span class="secnum">24.3.2.1</span> WeakMap.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-weakmap-prototype-object" title="Properties of the WeakMap Prototype Object"><span class="secnum">24.3.3</span> Properties of the WeakMap Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.constructor" title="WeakMap.prototype.constructor"><span class="secnum">24.3.3.1</span> WeakMap.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.delete" title="WeakMap.prototype.delete ( key )"><span class="secnum">24.3.3.2</span> WeakMap.prototype.delete ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.get" title="WeakMap.prototype.get ( key )"><span class="secnum">24.3.3.3</span> WeakMap.prototype.get ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.getorinsert" title="WeakMap.prototype.getOrInsert ( key, value )"><span class="secnum">24.3.3.4</span> WeakMap.prototype.getOrInsert ( <var>key</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.getorinsertcomputed" title="WeakMap.prototype.getOrInsertComputed ( key, callback )"><span class="secnum">24.3.3.5</span> WeakMap.prototype.getOrInsertComputed ( <var>key</var>, <var>callback</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.has" title="WeakMap.prototype.has ( key )"><span class="secnum">24.3.3.6</span> WeakMap.prototype.has ( <var>key</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype.set" title="WeakMap.prototype.set ( key, value )"><span class="secnum">24.3.3.7</span> WeakMap.prototype.set ( <var>key</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakmap.prototype-%symbol.tostringtag%" title="WeakMap.prototype [ %Symbol.toStringTag% ]"><span class="secnum">24.3.3.8</span> WeakMap.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-properties-of-weakmap-instances" title="Properties of WeakMap Instances"><span class="secnum">24.3.4</span> Properties of WeakMap Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-weakset-constructor" title="The WeakSet Constructor"><span class="secnum">24.4.1</span> The WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset-iterable" title="WeakSet ( [ iterable ] )"><span class="secnum">24.4.1.1</span> WeakSet ( [ <var>iterable</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype" title="WeakSet.prototype"><span class="secnum">24.4.2.1</span> WeakSet.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-properties-of-the-weakset-prototype-object" title="Properties of the WeakSet Prototype Object"><span class="secnum">24.4.3</span> Properties of the WeakSet Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype.add" title="WeakSet.prototype.add ( value )"><span class="secnum">24.4.3.1</span> WeakSet.prototype.add ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype.constructor" title="WeakSet.prototype.constructor"><span class="secnum">24.4.3.2</span> WeakSet.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype.delete" title="WeakSet.prototype.delete ( value )"><span class="secnum">24.4.3.3</span> WeakSet.prototype.delete ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype.has" title="WeakSet.prototype.has ( value )"><span class="secnum">24.4.3.4</span> WeakSet.prototype.has ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-weakset.prototype-%symbol.tostringtag%" title="WeakSet.prototype [ %Symbol.toStringTag% ]"><span class="secnum">24.4.3.5</span> WeakSet.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-properties-of-weakset-instances" title="Properties of WeakSet Instances"><span class="secnum">24.4.4</span> Properties of WeakSet Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="keyed-collections.html#sec-abstract-operations-for-keyed-collections" title="Abstract Operations for Keyed Collections"><span class="secnum">24.5</span> Abstract Operations for Keyed Collections</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="keyed-collections.html#sec-canonicalizekeyedcollectionkey" title="CanonicalizeKeyedCollectionKey ( key )"><span class="secnum">24.5.1</span> CanonicalizeKeyedCollectionKey ( <var>key</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">+</span><a href="structured-data.html#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer-notation" title="Notation"><span class="secnum">25.1.1</span> Notation</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects" title="Fixed-length and Resizable ArrayBuffer Objects"><span class="secnum">25.1.2</span> Fixed-length and Resizable ArrayBuffer Objects</a></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-abstract-operations-for-arraybuffer-objects" title="Abstract Operations For ArrayBuffer Objects"><span class="secnum">25.1.3</span> Abstract Operations For ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-allocatearraybuffer" title="AllocateArrayBuffer ( constructor, byteLength [ , maxByteLength ] )"><span class="secnum">25.1.3.1</span> AllocateArrayBuffer ( <var>constructor</var>, <var>byteLength</var> [ , <var>maxByteLength</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybufferbytelength" title="ArrayBufferByteLength ( arrayBuffer, order )"><span class="secnum">25.1.3.2</span> ArrayBufferByteLength ( <var>arrayBuffer</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffercopyanddetach" title="ArrayBufferCopyAndDetach ( arrayBuffer, newLength, preserveResizability )"><span class="secnum">25.1.3.3</span> ArrayBufferCopyAndDetach ( <var>arrayBuffer</var>, <var>newLength</var>, <var>preserveResizability</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isdetachedbuffer" title="IsDetachedBuffer ( arrayBuffer )"><span class="secnum">25.1.3.4</span> IsDetachedBuffer ( <var>arrayBuffer</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-detacharraybuffer" title="DetachArrayBuffer ( arrayBuffer [ , key ] )"><span class="secnum">25.1.3.5</span> DetachArrayBuffer ( <var>arrayBuffer</var> [ , <var>key</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-clonearraybuffer" title="CloneArrayBuffer ( srcBuffer, srcByteOffset, srcLength )"><span class="secnum">25.1.3.6</span> CloneArrayBuffer ( <var>srcBuffer</var>, <var>srcByteOffset</var>, <var>srcLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getarraybuffermaxbytelengthoption" title="GetArrayBufferMaxByteLengthOption ( options )"><span class="secnum">25.1.3.7</span> GetArrayBufferMaxByteLengthOption ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-hostresizearraybuffer" title="HostResizeArrayBuffer ( buffer, newByteLength )"><span class="secnum">25.1.3.8</span> HostResizeArrayBuffer ( <var>buffer</var>, <var>newByteLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isfixedlengtharraybuffer" title="IsFixedLengthArrayBuffer ( arrayBuffer )"><span class="secnum">25.1.3.9</span> IsFixedLengthArrayBuffer ( <var>arrayBuffer</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isunsignedelementtype" title="IsUnsignedElementType ( type )"><span class="secnum">25.1.3.10</span> IsUnsignedElementType ( <var>type</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isunclampedintegerelementtype" title="IsUnclampedIntegerElementType ( type )"><span class="secnum">25.1.3.11</span> IsUnclampedIntegerElementType ( <var>type</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isbigintelementtype" title="IsBigIntElementType ( type )"><span class="secnum">25.1.3.12</span> IsBigIntElementType ( <var>type</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isnotearconfiguration" title="IsNoTearConfiguration ( type, order )"><span class="secnum">25.1.3.13</span> IsNoTearConfiguration ( <var>type</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-rawbytestonumeric" title="RawBytesToNumeric ( type, rawBytes, isLittleEndian )"><span class="secnum">25.1.3.14</span> RawBytesToNumeric ( <var>type</var>, <var>rawBytes</var>, <var>isLittleEndian</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getrawbytesfromsharedblock" title="GetRawBytesFromSharedBlock ( block, byteIndex, type, isTypedArray, order )"><span class="secnum">25.1.3.15</span> GetRawBytesFromSharedBlock ( <var>block</var>, <var>byteIndex</var>, <var>type</var>, <var>isTypedArray</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getvaluefrombuffer" title="GetValueFromBuffer ( arrayBuffer, byteIndex, type, isTypedArray, order [ , isLittleEndian ] )"><span class="secnum">25.1.3.16</span> GetValueFromBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>isTypedArray</var>, <var>order</var> [ , <var>isLittleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-numerictorawbytes" title="NumericToRawBytes ( type, value, isLittleEndian )"><span class="secnum">25.1.3.17</span> NumericToRawBytes ( <var>type</var>, <var>value</var>, <var>isLittleEndian</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-setvalueinbuffer" title="SetValueInBuffer ( arrayBuffer, byteIndex, type, value, isTypedArray, order [ , isLittleEndian ] )"><span class="secnum">25.1.3.18</span> SetValueInBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>value</var>, <var>isTypedArray</var>, <var>order</var> [ , <var>isLittleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getmodifysetvalueinbuffer" title="GetModifySetValueInBuffer ( arrayBuffer, byteIndex, type, value, op )"><span class="secnum">25.1.3.19</span> GetModifySetValueInBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>value</var>, <var>op</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-arraybuffer-constructor" title="The ArrayBuffer Constructor"><span class="secnum">25.1.4</span> The ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer-length" title="ArrayBuffer ( length [ , options ] )"><span class="secnum">25.1.4.1</span> ArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.isview" title="ArrayBuffer.isView ( arg )"><span class="secnum">25.1.5.1</span> ArrayBuffer.isView ( <var>arg</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype" title="ArrayBuffer.prototype"><span class="secnum">25.1.5.2</span> ArrayBuffer.prototype</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-arraybuffer-%symbol.species%" title="get ArrayBuffer [ %Symbol.species% ]"><span class="secnum">25.1.5.3</span> get ArrayBuffer [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-arraybuffer-prototype-object" title="Properties of the ArrayBuffer Prototype Object"><span class="secnum">25.1.6</span> Properties of the ArrayBuffer Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-arraybuffer.prototype.bytelength" title="get ArrayBuffer.prototype.byteLength"><span class="secnum">25.1.6.1</span> get ArrayBuffer.prototype.byteLength</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype.constructor" title="ArrayBuffer.prototype.constructor"><span class="secnum">25.1.6.2</span> ArrayBuffer.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-arraybuffer.prototype.detached" title="get ArrayBuffer.prototype.detached"><span class="secnum">25.1.6.3</span> get ArrayBuffer.prototype.detached</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-arraybuffer.prototype.maxbytelength" title="get ArrayBuffer.prototype.maxByteLength"><span class="secnum">25.1.6.4</span> get ArrayBuffer.prototype.maxByteLength</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-arraybuffer.prototype.resizable" title="get ArrayBuffer.prototype.resizable"><span class="secnum">25.1.6.5</span> get ArrayBuffer.prototype.resizable</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype.resize" title="ArrayBuffer.prototype.resize ( newLength )"><span class="secnum">25.1.6.6</span> ArrayBuffer.prototype.resize ( <var>newLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype.slice" title="ArrayBuffer.prototype.slice ( start, end )"><span class="secnum">25.1.6.7</span> ArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype.transfer" title="ArrayBuffer.prototype.transfer ( [ newLength ] )"><span class="secnum">25.1.6.8</span> ArrayBuffer.prototype.transfer ( [ <var>newLength</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype.transfertofixedlength" title="ArrayBuffer.prototype.transferToFixedLength ( [ newLength ] )"><span class="secnum">25.1.6.9</span> ArrayBuffer.prototype.transferToFixedLength ( [ <var>newLength</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-arraybuffer.prototype-%symbol.tostringtag%" title="ArrayBuffer.prototype [ %Symbol.toStringTag% ]"><span class="secnum">25.1.6.10</span> ArrayBuffer.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-properties-of-the-arraybuffer-instances" title="Properties of ArrayBuffer Instances"><span class="secnum">25.1.7</span> Properties of ArrayBuffer Instances</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-resizable-arraybuffer-guidelines" title="Resizable ArrayBuffer Guidelines"><span class="secnum">25.1.8</span> Resizable ArrayBuffer Guidelines</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects" title="Fixed-length and Growable SharedArrayBuffer Objects"><span class="secnum">25.2.1</span> Fixed-length and Growable SharedArrayBuffer Objects</a></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-abstract-operations-for-sharedarraybuffer-objects" title="Abstract Operations for SharedArrayBuffer Objects"><span class="secnum">25.2.2</span> Abstract Operations for SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-allocatesharedarraybuffer" title="AllocateSharedArrayBuffer ( constructor, byteLength [ , maxByteLength ] )"><span class="secnum">25.2.2.1</span> AllocateSharedArrayBuffer ( <var>constructor</var>, <var>byteLength</var> [ , <var>maxByteLength</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-issharedarraybuffer" title="IsSharedArrayBuffer ( obj )"><span class="secnum">25.2.2.2</span> IsSharedArrayBuffer ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isgrowablesharedarraybuffer" title="IsGrowableSharedArrayBuffer ( obj )"><span class="secnum">25.2.2.3</span> IsGrowableSharedArrayBuffer ( <var>obj</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-hostgrowsharedarraybuffer" title="HostGrowSharedArrayBuffer ( buffer, newByteLength )"><span class="secnum">25.2.2.4</span> HostGrowSharedArrayBuffer ( <var>buffer</var>, <var>newByteLength</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-sharedarraybuffer-constructor" title="The SharedArrayBuffer Constructor"><span class="secnum">25.2.3</span> The SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer-length" title="SharedArrayBuffer ( length [ , options ] )"><span class="secnum">25.2.3.1</span> SharedArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer.prototype" title="SharedArrayBuffer.prototype"><span class="secnum">25.2.4.1</span> SharedArrayBuffer.prototype</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer-%symbol.species%" title="get SharedArrayBuffer [ %Symbol.species% ]"><span class="secnum">25.2.4.2</span> get SharedArrayBuffer [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-sharedarraybuffer-prototype-object" title="Properties of the SharedArrayBuffer Prototype Object"><span class="secnum">25.2.5</span> Properties of the SharedArrayBuffer Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-sharedarraybuffer.prototype.bytelength" title="get SharedArrayBuffer.prototype.byteLength"><span class="secnum">25.2.5.1</span> get SharedArrayBuffer.prototype.byteLength</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer.prototype.constructor" title="SharedArrayBuffer.prototype.constructor"><span class="secnum">25.2.5.2</span> SharedArrayBuffer.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer.prototype.grow" title="SharedArrayBuffer.prototype.grow ( newLength )"><span class="secnum">25.2.5.3</span> SharedArrayBuffer.prototype.grow ( <var>newLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-sharedarraybuffer.prototype.growable" title="get SharedArrayBuffer.prototype.growable"><span class="secnum">25.2.5.4</span> get SharedArrayBuffer.prototype.growable</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-sharedarraybuffer.prototype.maxbytelength" title="get SharedArrayBuffer.prototype.maxByteLength"><span class="secnum">25.2.5.5</span> get SharedArrayBuffer.prototype.maxByteLength</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer.prototype.slice" title="SharedArrayBuffer.prototype.slice ( start, end )"><span class="secnum">25.2.5.6</span> SharedArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-sharedarraybuffer.prototype-%symbol.tostringtag%" title="SharedArrayBuffer.prototype [ %Symbol.toStringTag% ]"><span class="secnum">25.2.5.7</span> SharedArrayBuffer.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-properties-of-the-sharedarraybuffer-instances" title="Properties of SharedArrayBuffer Instances"><span class="secnum">25.2.6</span> Properties of SharedArrayBuffer Instances</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-growable-sharedarraybuffer-guidelines" title="Growable SharedArrayBuffer Guidelines"><span class="secnum">25.2.7</span> Growable SharedArrayBuffer Guidelines</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="structured-data.html#sec-abstract-operations-for-dataview-objects" title="Abstract Operations For DataView Objects"><span class="secnum">25.3.1</span> Abstract Operations For DataView Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview-with-buffer-witness-records" title="DataView With Buffer Witness Records"><span class="secnum">25.3.1.1</span> DataView With Buffer Witness Records</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-makedataviewwithbufferwitnessrecord" title="MakeDataViewWithBufferWitnessRecord ( obj, order )"><span class="secnum">25.3.1.2</span> MakeDataViewWithBufferWitnessRecord ( <var>obj</var>, <var>order</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getviewbytelength" title="GetViewByteLength ( viewRecord )"><span class="secnum">25.3.1.3</span> GetViewByteLength ( <var>viewRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-isviewoutofbounds" title="IsViewOutOfBounds ( viewRecord )"><span class="secnum">25.3.1.4</span> IsViewOutOfBounds ( <var>viewRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getviewvalue" title="GetViewValue ( view, requestIndex, isLittleEndian, type )"><span class="secnum">25.3.1.5</span> GetViewValue ( <var>view</var>, <var>requestIndex</var>, <var>isLittleEndian</var>, <var>type</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-setviewvalue" title="SetViewValue ( view, requestIndex, isLittleEndian, type, value )"><span class="secnum">25.3.1.6</span> SetViewValue ( <var>view</var>, <var>requestIndex</var>, <var>isLittleEndian</var>, <var>type</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-dataview-constructor" title="The DataView Constructor"><span class="secnum">25.3.2</span> The DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview-buffer-byteoffset-bytelength" title="DataView ( buffer [ , byteOffset [ , byteLength ] ] )"><span class="secnum">25.3.2.1</span> DataView ( <var>buffer</var> [ , <var>byteOffset</var> [ , <var>byteLength</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype" title="DataView.prototype"><span class="secnum">25.3.3.1</span> DataView.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-properties-of-the-dataview-prototype-object" title="Properties of the DataView Prototype Object"><span class="secnum">25.3.4</span> Properties of the DataView Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-dataview.prototype.buffer" title="get DataView.prototype.buffer"><span class="secnum">25.3.4.1</span> get DataView.prototype.buffer</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-dataview.prototype.bytelength" title="get DataView.prototype.byteLength"><span class="secnum">25.3.4.2</span> get DataView.prototype.byteLength</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-get-dataview.prototype.byteoffset" title="get DataView.prototype.byteOffset"><span class="secnum">25.3.4.3</span> get DataView.prototype.byteOffset</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.constructor" title="DataView.prototype.constructor"><span class="secnum">25.3.4.4</span> DataView.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getbigint64" title="DataView.prototype.getBigInt64 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.5</span> DataView.prototype.getBigInt64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getbiguint64" title="DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.6</span> DataView.prototype.getBigUint64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getfloat16" title="DataView.prototype.getFloat16 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.7</span> DataView.prototype.getFloat16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getfloat32" title="DataView.prototype.getFloat32 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.8</span> DataView.prototype.getFloat32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getfloat64" title="DataView.prototype.getFloat64 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.9</span> DataView.prototype.getFloat64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getint8" title="DataView.prototype.getInt8 ( byteOffset )"><span class="secnum">25.3.4.10</span> DataView.prototype.getInt8 ( <var>byteOffset</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getint16" title="DataView.prototype.getInt16 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.11</span> DataView.prototype.getInt16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getint32" title="DataView.prototype.getInt32 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.12</span> DataView.prototype.getInt32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getuint8" title="DataView.prototype.getUint8 ( byteOffset )"><span class="secnum">25.3.4.13</span> DataView.prototype.getUint8 ( <var>byteOffset</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getuint16" title="DataView.prototype.getUint16 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.14</span> DataView.prototype.getUint16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.getuint32" title="DataView.prototype.getUint32 ( byteOffset [ , littleEndian ] )"><span class="secnum">25.3.4.15</span> DataView.prototype.getUint32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setbigint64" title="DataView.prototype.setBigInt64 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.16</span> DataView.prototype.setBigInt64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setbiguint64" title="DataView.prototype.setBigUint64 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.17</span> DataView.prototype.setBigUint64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setfloat16" title="DataView.prototype.setFloat16 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.18</span> DataView.prototype.setFloat16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setfloat32" title="DataView.prototype.setFloat32 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.19</span> DataView.prototype.setFloat32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setfloat64" title="DataView.prototype.setFloat64 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.20</span> DataView.prototype.setFloat64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setint8" title="DataView.prototype.setInt8 ( byteOffset, value )"><span class="secnum">25.3.4.21</span> DataView.prototype.setInt8 ( <var>byteOffset</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setint16" title="DataView.prototype.setInt16 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.22</span> DataView.prototype.setInt16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setint32" title="DataView.prototype.setInt32 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.23</span> DataView.prototype.setInt32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setuint8" title="DataView.prototype.setUint8 ( byteOffset, value )"><span class="secnum">25.3.4.24</span> DataView.prototype.setUint8 ( <var>byteOffset</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setuint16" title="DataView.prototype.setUint16 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.25</span> DataView.prototype.setUint16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype.setuint32" title="DataView.prototype.setUint32 ( byteOffset, value [ , littleEndian ] )"><span class="secnum">25.3.4.26</span> DataView.prototype.setUint32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dataview.prototype-%symbol.tostringtag%" title="DataView.prototype [ %Symbol.toStringTag% ]"><span class="secnum">25.3.4.27</span> DataView.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-properties-of-dataview-instances" title="Properties of DataView Instances"><span class="secnum">25.3.5</span> Properties of DataView Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-atomics-object" title="The Atomics Object"><span class="secnum">25.4</span> The Atomics Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-waiter-record" title="Waiter Record"><span class="secnum">25.4.1</span> Waiter Record</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-waiterlist-records" title="WaiterList Records"><span class="secnum">25.4.2</span> WaiterList Records</a></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-abstract-operations-for-atomics" title="Abstract Operations for Atomics"><span class="secnum">25.4.3</span> Abstract Operations for Atomics</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-validateintegertypedarray" title="ValidateIntegerTypedArray ( typedArray, waitable )"><span class="secnum">25.4.3.1</span> ValidateIntegerTypedArray ( <var>typedArray</var>, <var>waitable</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-validateatomicaccess" title="ValidateAtomicAccess ( taRecord, requestIndex )"><span class="secnum">25.4.3.2</span> ValidateAtomicAccess ( <var>taRecord</var>, <var>requestIndex</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-validateatomicaccessonintegertypedarray" title="ValidateAtomicAccessOnIntegerTypedArray ( typedArray, requestIndex )"><span class="secnum">25.4.3.3</span> ValidateAtomicAccessOnIntegerTypedArray ( <var>typedArray</var>, <var>requestIndex</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-revalidateatomicaccess" title="RevalidateAtomicAccess ( typedArray, byteIndexInBuffer )"><span class="secnum">25.4.3.4</span> RevalidateAtomicAccess ( <var>typedArray</var>, <var>byteIndexInBuffer</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-getwaiterlist" title="GetWaiterList ( block, i )"><span class="secnum">25.4.3.5</span> GetWaiterList ( <var>block</var>, <var>i</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-entercriticalsection" title="EnterCriticalSection ( WL )"><span class="secnum">25.4.3.6</span> EnterCriticalSection ( <var>WL</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-leavecriticalsection" title="LeaveCriticalSection ( WL )"><span class="secnum">25.4.3.7</span> LeaveCriticalSection ( <var>WL</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-addwaiter" title="AddWaiter ( WL, waiterRecord )"><span class="secnum">25.4.3.8</span> AddWaiter ( <var>WL</var>, <var>waiterRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-removewaiter" title="RemoveWaiter ( WL, waiterRecord )"><span class="secnum">25.4.3.9</span> RemoveWaiter ( <var>WL</var>, <var>waiterRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-removewaiters" title="RemoveWaiters ( WL, c )"><span class="secnum">25.4.3.10</span> RemoveWaiters ( <var>WL</var>, <var>c</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-suspendthisagent" title="SuspendThisAgent ( WL, waiterRecord )"><span class="secnum">25.4.3.11</span> SuspendThisAgent ( <var>WL</var>, <var>waiterRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-notifywaiter" title="NotifyWaiter ( WL, waiterRecord )"><span class="secnum">25.4.3.12</span> NotifyWaiter ( <var>WL</var>, <var>waiterRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-enqueueresolveinagentjob" title="EnqueueResolveInAgentJob ( agentSignifier, promiseCapability, resolution )"><span class="secnum">25.4.3.13</span> EnqueueResolveInAgentJob ( <var>agentSignifier</var>, <var>promiseCapability</var>, <var>resolution</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-dowait" title="DoWait ( mode, typedArray, index, value, timeout )"><span class="secnum">25.4.3.14</span> DoWait ( <var>mode</var>, <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-enqueueatomicswaitasynctimeoutjob" title="EnqueueAtomicsWaitAsyncTimeoutJob ( WL, waiterRecord )"><span class="secnum">25.4.3.15</span> EnqueueAtomicsWaitAsyncTimeoutJob ( <var>WL</var>, <var>waiterRecord</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomiccompareexchangeinsharedblock" title="AtomicCompareExchangeInSharedBlock ( block, byteIndexInBuffer, elementSize, expectedBytes, replacementBytes )"><span class="secnum">25.4.3.16</span> AtomicCompareExchangeInSharedBlock ( <var>block</var>, <var>byteIndexInBuffer</var>, <var>elementSize</var>, <var>expectedBytes</var>, <var>replacementBytes</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomicreadmodifywrite" title="AtomicReadModifyWrite ( typedArray, index, value, op )"><span class="secnum">25.4.3.17</span> AtomicReadModifyWrite ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>op</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-bytelistbitwiseop" title="ByteListBitwiseOp ( op, xBytes, yBytes )"><span class="secnum">25.4.3.18</span> ByteListBitwiseOp ( <var>op</var>, <var>xBytes</var>, <var>yBytes</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-bytelistequal" title="ByteListEqual ( xBytes, yBytes )"><span class="secnum">25.4.3.19</span> ByteListEqual ( <var>xBytes</var>, <var>yBytes</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.add" title="Atomics.add ( typedArray, index, value )"><span class="secnum">25.4.4</span> Atomics.add ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.and" title="Atomics.and ( typedArray, index, value )"><span class="secnum">25.4.5</span> Atomics.and ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.compareexchange" title="Atomics.compareExchange ( typedArray, index, expectedValue, replacementValue )"><span class="secnum">25.4.6</span> Atomics.compareExchange ( <var>typedArray</var>, <var>index</var>, <var>expectedValue</var>, <var>replacementValue</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.exchange" title="Atomics.exchange ( typedArray, index, value )"><span class="secnum">25.4.7</span> Atomics.exchange ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.islockfree" title="Atomics.isLockFree ( size )"><span class="secnum">25.4.8</span> Atomics.isLockFree ( <var>size</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.load" title="Atomics.load ( typedArray, index )"><span class="secnum">25.4.9</span> Atomics.load ( <var>typedArray</var>, <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.or" title="Atomics.or ( typedArray, index, value )"><span class="secnum">25.4.10</span> Atomics.or ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.store" title="Atomics.store ( typedArray, index, value )"><span class="secnum">25.4.11</span> Atomics.store ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.sub" title="Atomics.sub ( typedArray, index, value )"><span class="secnum">25.4.12</span> Atomics.sub ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.wait" title="Atomics.wait ( typedArray, index, value, timeout )"><span class="secnum">25.4.13</span> Atomics.wait ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.waitasync" title="Atomics.waitAsync ( typedArray, index, value, timeout )"><span class="secnum">25.4.14</span> Atomics.waitAsync ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.notify" title="Atomics.notify ( typedArray, index, count )"><span class="secnum">25.4.15</span> Atomics.notify ( <var>typedArray</var>, <var>index</var>, <var>count</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics.xor" title="Atomics.xor ( typedArray, index, value )"><span class="secnum">25.4.16</span> Atomics.xor ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-atomics-%symbol.tostringtag%" title="Atomics [ %Symbol.toStringTag% ]"><span class="secnum">25.4.17</span> Atomics [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-json-object" title="The JSON Object"><span class="secnum">25.5</span> The JSON Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="structured-data.html#sec-json.parse" title="JSON.parse ( text [ , reviver ] )"><span class="secnum">25.5.1</span> JSON.parse ( <var>text</var> [ , <var>reviver</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-ParseJSON" title="ParseJSON ( text )"><span class="secnum">25.5.1.1</span> ParseJSON ( <var>text</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-internalizejsonproperty" title="InternalizeJSONProperty ( holder, name, reviver )"><span class="secnum">25.5.1.2</span> InternalizeJSONProperty ( <var>holder</var>, <var>name</var>, <var>reviver</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="structured-data.html#sec-json.stringify" title="JSON.stringify ( value [ , replacer [ , space ] ] )"><span class="secnum">25.5.2</span> JSON.stringify ( <var>value</var> [ , <var>replacer</var> [ , <var>space</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-json-serialization-record" title="JSON Serialization Record"><span class="secnum">25.5.2.1</span> JSON Serialization Record</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-serializejsonproperty" title="SerializeJSONProperty ( state, key, holder )"><span class="secnum">25.5.2.2</span> SerializeJSONProperty ( <var>state</var>, <var>key</var>, <var>holder</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-quotejsonstring" title="QuoteJSONString ( value )"><span class="secnum">25.5.2.3</span> QuoteJSONString ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-unicodeescape" title="UnicodeEscape ( C )"><span class="secnum">25.5.2.4</span> UnicodeEscape ( <var>C</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-serializejsonobject" title="SerializeJSONObject ( state, value )"><span class="secnum">25.5.2.5</span> SerializeJSONObject ( <var>state</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-serializejsonarray" title="SerializeJSONArray ( state, value )"><span class="secnum">25.5.2.6</span> SerializeJSONArray ( <var>state</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="structured-data.html#sec-json-%symbol.tostringtag%" title="JSON [ %Symbol.toStringTag% ]"><span class="secnum">25.5.3</span> JSON [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-weak-ref-constructor" title="The WeakRef Constructor"><span class="secnum">26.1.1</span> The WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weak-ref-target" title="WeakRef ( target )"><span class="secnum">26.1.1.1</span> WeakRef ( <var>target</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weak-ref.prototype" title="WeakRef.prototype"><span class="secnum">26.1.2.1</span> WeakRef.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-properties-of-the-weak-ref-prototype-object" title="Properties of the WeakRef Prototype Object"><span class="secnum">26.1.3</span> Properties of the WeakRef Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weak-ref.prototype.constructor" title="WeakRef.prototype.constructor"><span class="secnum">26.1.3.1</span> WeakRef.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weak-ref.prototype.deref" title="WeakRef.prototype.deref ( )"><span class="secnum">26.1.3.2</span> WeakRef.prototype.deref ( )</a></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weak-ref.prototype-%symbol.tostringtag%" title="WeakRef.prototype [ %Symbol.toStringTag% ]"><span class="secnum">26.1.3.3</span> WeakRef.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-weakref-abstract-operations" title="WeakRef Abstract Operations"><span class="secnum">26.1.4</span> WeakRef Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-weakrefderef" title="WeakRefDeref ( weakRef )"><span class="secnum">26.1.4.1</span> WeakRefDeref ( <var>weakRef</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-properties-of-weak-ref-instances" title="Properties of WeakRef Instances"><span class="secnum">26.1.5</span> Properties of WeakRef Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-finalization-registry-constructor" title="The FinalizationRegistry Constructor"><span class="secnum">26.2.1</span> The FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry-cleanup-callback" title="FinalizationRegistry ( cleanupCallback )"><span class="secnum">26.2.1.1</span> FinalizationRegistry ( <var>cleanupCallback</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry.prototype" title="FinalizationRegistry.prototype"><span class="secnum">26.2.2.1</span> FinalizationRegistry.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="managing-memory.html#sec-properties-of-the-finalization-registry-prototype-object" title="Properties of the FinalizationRegistry Prototype Object"><span class="secnum">26.2.3</span> Properties of the FinalizationRegistry Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry.prototype.constructor" title="FinalizationRegistry.prototype.constructor"><span class="secnum">26.2.3.1</span> FinalizationRegistry.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry.prototype.register" title="FinalizationRegistry.prototype.register ( target, heldValue [ , unregisterToken ] )"><span class="secnum">26.2.3.2</span> FinalizationRegistry.prototype.register ( <var>target</var>, <var>heldValue</var> [ , <var>unregisterToken</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry.prototype.unregister" title="FinalizationRegistry.prototype.unregister ( unregisterToken )"><span class="secnum">26.2.3.3</span> FinalizationRegistry.prototype.unregister ( <var>unregisterToken</var> )</a></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-finalization-registry.prototype-%symbol.tostringtag%" title="FinalizationRegistry.prototype [ %Symbol.toStringTag% ]"><span class="secnum">26.2.3.4</span> FinalizationRegistry.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="managing-memory.html#sec-properties-of-finalization-registry-instances" title="Properties of FinalizationRegistry Instances"><span class="secnum">26.2.4</span> Properties of FinalizationRegistry Instances</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iteration" title="Iteration"><span class="secnum">27.1</span> Iteration</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-common-iteration-interfaces" title="Common Iteration Interfaces"><span class="secnum">27.1.1</span> Common Iteration Interfaces</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterable-interface" title="The Iterable Interface"><span class="secnum">27.1.1.1</span> The Iterable Interface</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator-interface" title="The Iterator Interface"><span class="secnum">27.1.1.2</span> The Iterator Interface</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asynciterable-interface" title="The Async Iterable Interface"><span class="secnum">27.1.1.3</span> The Async Iterable Interface</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asynciterator-interface" title="The Async Iterator Interface"><span class="secnum">27.1.1.4</span> The Async Iterator Interface</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iteratorresult-interface" title="The IteratorResult Interface"><span class="secnum">27.1.1.5</span> The IteratorResult Interface</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator-helper-objects" title="Iterator Helper Objects"><span class="secnum">27.1.2</span> Iterator Helper Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-%iteratorhelperprototype%-object" title="The %IteratorHelperPrototype% Object"><span class="secnum">27.1.2.1</span> The %IteratorHelperPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%iteratorhelperprototype%.next" title="%IteratorHelperPrototype%.next ( )"><span class="secnum">27.1.2.1.1</span> %IteratorHelperPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%iteratorhelperprototype%.return" title="%IteratorHelperPrototype%.return ( )"><span class="secnum">27.1.2.1.2</span> %IteratorHelperPrototype%.return ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%iteratorhelperprototype%-%symbol.tostringtag%" title="%IteratorHelperPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">27.1.2.1.3</span> %IteratorHelperPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator-objects" title="Iterator Objects"><span class="secnum">27.1.3</span> Iterator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator-constructor" title="The Iterator Constructor"><span class="secnum">27.1.3.1</span> The Iterator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator" title="Iterator ( )"><span class="secnum">27.1.3.1.1</span> Iterator ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-the-iterator-constructor" title="Properties of the Iterator Constructor"><span class="secnum">27.1.3.2</span> Properties of the Iterator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.concat" title="Iterator.concat ( ...items )"><span class="secnum">27.1.3.2.1</span> Iterator.concat ( ...<var>items</var> )</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator.from" title="Iterator.from ( O )"><span class="secnum">27.1.3.2.2</span> Iterator.from ( <var>O</var> )</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-%wrapforvaliditeratorprototype%-object" title="The %WrapForValidIteratorPrototype% Object"><span class="secnum">27.1.3.2.2.1</span> The %WrapForValidIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%wrapforvaliditeratorprototype%.next" title="%WrapForValidIteratorPrototype%.next ( )"><span class="secnum">27.1.3.2.2.1.1</span> %WrapForValidIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%wrapforvaliditeratorprototype%.return" title="%WrapForValidIteratorPrototype%.return ( )"><span class="secnum">27.1.3.2.2.1.2</span> %WrapForValidIteratorPrototype%.return ( )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype" title="Iterator.prototype"><span class="secnum">27.1.3.2.3</span> Iterator.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-%iterator.prototype%-object" title="Properties of the Iterator Prototype Object"><span class="secnum">27.1.3.3</span> Properties of the Iterator Prototype Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator.prototype.constructor" title="Iterator.prototype.constructor"><span class="secnum">27.1.3.3.1</span> Iterator.prototype.constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-get-iterator.prototype.constructor" title="get Iterator.prototype.constructor"><span class="secnum">27.1.3.3.1.1</span> get Iterator.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-set-iterator.prototype.constructor" title="set Iterator.prototype.constructor"><span class="secnum">27.1.3.3.1.2</span> set Iterator.prototype.constructor</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.drop" title="Iterator.prototype.drop ( limit )"><span class="secnum">27.1.3.3.2</span> Iterator.prototype.drop ( <var>limit</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.every" title="Iterator.prototype.every ( predicate )"><span class="secnum">27.1.3.3.3</span> Iterator.prototype.every ( <var>predicate</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.filter" title="Iterator.prototype.filter ( predicate )"><span class="secnum">27.1.3.3.4</span> Iterator.prototype.filter ( <var>predicate</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.find" title="Iterator.prototype.find ( predicate )"><span class="secnum">27.1.3.3.5</span> Iterator.prototype.find ( <var>predicate</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.flatmap" title="Iterator.prototype.flatMap ( mapper )"><span class="secnum">27.1.3.3.6</span> Iterator.prototype.flatMap ( <var>mapper</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.foreach" title="Iterator.prototype.forEach ( procedure )"><span class="secnum">27.1.3.3.7</span> Iterator.prototype.forEach ( <var>procedure</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.map" title="Iterator.prototype.map ( mapper )"><span class="secnum">27.1.3.3.8</span> Iterator.prototype.map ( <var>mapper</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.reduce" title="Iterator.prototype.reduce ( reducer [ , initialValue ] )"><span class="secnum">27.1.3.3.9</span> Iterator.prototype.reduce ( <var>reducer</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.some" title="Iterator.prototype.some ( predicate )"><span class="secnum">27.1.3.3.10</span> Iterator.prototype.some ( <var>predicate</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.take" title="Iterator.prototype.take ( limit )"><span class="secnum">27.1.3.3.11</span> Iterator.prototype.take ( <var>limit</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype.toarray" title="Iterator.prototype.toArray ( )"><span class="secnum">27.1.3.3.12</span> Iterator.prototype.toArray ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-iterator.prototype-%symbol.iterator%" title="Iterator.prototype [ %Symbol.iterator% ] ( )"><span class="secnum">27.1.3.3.13</span> Iterator.prototype [ %Symbol.iterator% ] ( )</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-iterator.prototype-%symbol.tostringtag%" title="Iterator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.1.3.3.14</span> Iterator.prototype [ %Symbol.toStringTag% ]</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-get-iterator.prototype-%symbol.tostringtag%" title="get Iterator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.1.3.3.14.1</span> get Iterator.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-set-iterator.prototype-%symbol.tostringtag%" title="set Iterator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.1.3.3.14.2</span> set Iterator.prototype [ %Symbol.toStringTag% ]</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asynciteratorprototype" title="The %AsyncIteratorPrototype% Object"><span class="secnum">27.1.4</span> The %AsyncIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%asynciteratorprototype%-%symbol.asynciterator%" title="%AsyncIteratorPrototype% [ %Symbol.asyncIterator% ] ( )"><span class="secnum">27.1.4.1</span> %AsyncIteratorPrototype% [ %Symbol.asyncIterator% ] ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-from-sync-iterator-objects" title="Async-from-Sync Iterator Objects"><span class="secnum">27.1.5</span> Async-from-Sync Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-createasyncfromsynciterator" title="CreateAsyncFromSyncIterator ( syncIteratorRecord )"><span class="secnum">27.1.5.1</span> CreateAsyncFromSyncIterator ( <var>syncIteratorRecord</var> )</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-%asyncfromsynciteratorprototype%-object" title="The %AsyncFromSyncIteratorPrototype% Object"><span class="secnum">27.1.5.2</span> The %AsyncFromSyncIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%asyncfromsynciteratorprototype%.next" title="%AsyncFromSyncIteratorPrototype%.next ( [ value ] )"><span class="secnum">27.1.5.2.1</span> %AsyncFromSyncIteratorPrototype%.next ( [ <var>value</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%asyncfromsynciteratorprototype%.return" title="%AsyncFromSyncIteratorPrototype%.return ( [ value ] )"><span class="secnum">27.1.5.2.2</span> %AsyncFromSyncIteratorPrototype%.return ( [ <var>value</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-%asyncfromsynciteratorprototype%.throw" title="%AsyncFromSyncIteratorPrototype%.throw ( [ value ] )"><span class="secnum">27.1.5.2.3</span> %AsyncFromSyncIteratorPrototype%.throw ( [ <var>value</var> ] )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-properties-of-async-from-sync-iterator-instances" title="Properties of Async-from-Sync Iterator Instances"><span class="secnum">27.1.5.3</span> Properties of Async-from-Sync Iterator Instances</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncfromsynciteratorcontinuation" title="AsyncFromSyncIteratorContinuation ( result, promiseCapability, syncIteratorRecord, closeOnRejection )"><span class="secnum">27.1.5.4</span> AsyncFromSyncIteratorContinuation ( <var>result</var>, <var>promiseCapability</var>, <var>syncIteratorRecord</var>, <var>closeOnRejection</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise-abstract-operations" title="Promise Abstract Operations"><span class="secnum">27.2.1</span> Promise Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promisecapability-records" title="PromiseCapability Records"><span class="secnum">27.2.1.1</span> PromiseCapability Records</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-ifabruptrejectpromise" title="IfAbruptRejectPromise ( value, capability )"><span class="secnum">27.2.1.1.1</span> IfAbruptRejectPromise ( <var>value</var>, <var>capability</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promisereaction-records" title="PromiseReaction Records"><span class="secnum">27.2.1.2</span> PromiseReaction Records</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-createresolvingfunctions" title="CreateResolvingFunctions ( toResolve )"><span class="secnum">27.2.1.3</span> CreateResolvingFunctions ( <var>toResolve</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-fulfillpromise" title="FulfillPromise ( promise, value )"><span class="secnum">27.2.1.4</span> FulfillPromise ( <var>promise</var>, <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-newpromisecapability" title="NewPromiseCapability ( C )"><span class="secnum">27.2.1.5</span> NewPromiseCapability ( <var>C</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-ispromise" title="IsPromise ( x )"><span class="secnum">27.2.1.6</span> IsPromise ( <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-rejectpromise" title="RejectPromise ( promise, reason )"><span class="secnum">27.2.1.7</span> RejectPromise ( <var>promise</var>, <var>reason</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-triggerpromisereactions" title="TriggerPromiseReactions ( reactions, argument )"><span class="secnum">27.2.1.8</span> TriggerPromiseReactions ( <var>reactions</var>, <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-host-promise-rejection-tracker" title="HostPromiseRejectionTracker ( promise, operation )"><span class="secnum">27.2.1.9</span> HostPromiseRejectionTracker ( <var>promise</var>, <var>operation</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise-jobs" title="Promise Jobs"><span class="secnum">27.2.2</span> Promise Jobs</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-newpromisereactionjob" title="NewPromiseReactionJob ( reaction, argument )"><span class="secnum">27.2.2.1</span> NewPromiseReactionJob ( <var>reaction</var>, <var>argument</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-newpromiseresolvethenablejob" title="NewPromiseResolveThenableJob ( promiseToResolve, thenable, then )"><span class="secnum">27.2.2.2</span> NewPromiseResolveThenableJob ( <var>promiseToResolve</var>, <var>thenable</var>, <var>then</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise-constructor" title="The Promise Constructor"><span class="secnum">27.2.3</span> The Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise-executor" title="Promise ( executor )"><span class="secnum">27.2.3.1</span> Promise ( <var>executor</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.all" title="Promise.all ( iterable )"><span class="secnum">27.2.4.1</span> Promise.all ( <var>iterable</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-getpromiseresolve" title="GetPromiseResolve ( promiseConstructor )"><span class="secnum">27.2.4.1.1</span> GetPromiseResolve ( <var>promiseConstructor</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-performpromiseall" title="PerformPromiseAll ( iteratorRecord, constructor, resultCapability, promiseResolve )"><span class="secnum">27.2.4.1.2</span> PerformPromiseAll ( <var>iteratorRecord</var>, <var>constructor</var>, <var>resultCapability</var>, <var>promiseResolve</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.allsettled" title="Promise.allSettled ( iterable )"><span class="secnum">27.2.4.2</span> Promise.allSettled ( <var>iterable</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-performpromiseallsettled" title="PerformPromiseAllSettled ( iteratorRecord, constructor, resultCapability, promiseResolve )"><span class="secnum">27.2.4.2.1</span> PerformPromiseAllSettled ( <var>iteratorRecord</var>, <var>constructor</var>, <var>resultCapability</var>, <var>promiseResolve</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.any" title="Promise.any ( iterable )"><span class="secnum">27.2.4.3</span> Promise.any ( <var>iterable</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-performpromiseany" title="PerformPromiseAny ( iteratorRecord, constructor, resultCapability, promiseResolve )"><span class="secnum">27.2.4.3.1</span> PerformPromiseAny ( <var>iteratorRecord</var>, <var>constructor</var>, <var>resultCapability</var>, <var>promiseResolve</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.prototype" title="Promise.prototype"><span class="secnum">27.2.4.4</span> Promise.prototype</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.race" title="Promise.race ( iterable )"><span class="secnum">27.2.4.5</span> Promise.race ( <var>iterable</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-performpromiserace" title="PerformPromiseRace ( iteratorRecord, constructor, resultCapability, promiseResolve )"><span class="secnum">27.2.4.5.1</span> PerformPromiseRace ( <var>iteratorRecord</var>, <var>constructor</var>, <var>resultCapability</var>, <var>promiseResolve</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.reject" title="Promise.reject ( r )"><span class="secnum">27.2.4.6</span> Promise.reject ( <var>r</var> )</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.resolve" title="Promise.resolve ( x )"><span class="secnum">27.2.4.7</span> Promise.resolve ( <var>x</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise-resolve" title="PromiseResolve ( C, x )"><span class="secnum">27.2.4.7.1</span> PromiseResolve ( <var>C</var>, <var>x</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.try" title="Promise.try ( callback, ...args )"><span class="secnum">27.2.4.8</span> Promise.try ( <var>callback</var>, ...<var>args</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.withResolvers" title="Promise.withResolvers ( )"><span class="secnum">27.2.4.9</span> Promise.withResolvers ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-get-promise-%symbol.species%" title="get Promise [ %Symbol.species% ]"><span class="secnum">27.2.4.10</span> get Promise [ %Symbol.species% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-the-promise-prototype-object" title="Properties of the Promise Prototype Object"><span class="secnum">27.2.5</span> Properties of the Promise Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.prototype.catch" title="Promise.prototype.catch ( onRejected )"><span class="secnum">27.2.5.1</span> Promise.prototype.catch ( <var>onRejected</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.prototype.constructor" title="Promise.prototype.constructor"><span class="secnum">27.2.5.2</span> Promise.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.prototype.finally" title="Promise.prototype.finally ( onFinally )"><span class="secnum">27.2.5.3</span> Promise.prototype.finally ( <var>onFinally</var> )</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-promise.prototype.then" title="Promise.prototype.then ( onFulfilled, onRejected )"><span class="secnum">27.2.5.4</span> Promise.prototype.then ( <var>onFulfilled</var>, <var>onRejected</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-performpromisethen" title="PerformPromiseThen ( promise, onFulfilled, onRejected [ , resultCapability ] )"><span class="secnum">27.2.5.4.1</span> PerformPromiseThen ( <var>promise</var>, <var>onFulfilled</var>, <var>onRejected</var> [ , <var>resultCapability</var> ] )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-promise.prototype-%symbol.tostringtag%" title="Promise.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.2.5.5</span> Promise.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-properties-of-promise-instances" title="Properties of Promise Instances"><span class="secnum">27.2.6</span> Properties of Promise Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-generatorfunction-objects" title="GeneratorFunction Objects"><span class="secnum">27.3</span> GeneratorFunction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-generatorfunction-constructor" title="The GeneratorFunction Constructor"><span class="secnum">27.3.1</span> The GeneratorFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction" title="GeneratorFunction ( ...parameterArgs, bodyArg )"><span class="secnum">27.3.1.1</span> GeneratorFunction ( ...<var>parameterArgs</var>, <var>bodyArg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-the-generatorfunction-constructor" title="Properties of the GeneratorFunction Constructor"><span class="secnum">27.3.2</span> Properties of the GeneratorFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction.prototype" title="GeneratorFunction.prototype"><span class="secnum">27.3.2.1</span> GeneratorFunction.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-the-generatorfunction-prototype-object" title="Properties of the GeneratorFunction Prototype Object"><span class="secnum">27.3.3</span> Properties of the GeneratorFunction Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction.prototype.constructor" title="GeneratorFunction.prototype.constructor"><span class="secnum">27.3.3.1</span> GeneratorFunction.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction.prototype.prototype" title="GeneratorFunction.prototype.prototype"><span class="secnum">27.3.3.2</span> GeneratorFunction.prototype.prototype</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction.prototype-%symbol.tostringtag%" title="GeneratorFunction.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.3.3.3</span> GeneratorFunction.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-generatorfunction-instances" title="GeneratorFunction Instances"><span class="secnum">27.3.4</span> GeneratorFunction Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction-instances-length" title="length"><span class="secnum">27.3.4.1</span> length</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction-instances-name" title="name"><span class="secnum">27.3.4.2</span> name</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorfunction-instances-prototype" title="prototype"><span class="secnum">27.3.4.3</span> prototype</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-objects" title="AsyncGeneratorFunction Objects"><span class="secnum">27.4</span> AsyncGeneratorFunction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-constructor" title="The AsyncGeneratorFunction Constructor"><span class="secnum">27.4.1</span> The AsyncGeneratorFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction" title="AsyncGeneratorFunction ( ...parameterArgs, bodyArg )"><span class="secnum">27.4.1.1</span> AsyncGeneratorFunction ( ...<var>parameterArgs</var>, <var>bodyArg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-asyncgeneratorfunction" title="Properties of the AsyncGeneratorFunction Constructor"><span class="secnum">27.4.2</span> Properties of the AsyncGeneratorFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-prototype" title="AsyncGeneratorFunction.prototype"><span class="secnum">27.4.2.1</span> AsyncGeneratorFunction.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-asyncgeneratorfunction-prototype" title="Properties of the AsyncGeneratorFunction Prototype Object"><span class="secnum">27.4.3</span> Properties of the AsyncGeneratorFunction Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-prototype-constructor" title="AsyncGeneratorFunction.prototype.constructor"><span class="secnum">27.4.3.1</span> AsyncGeneratorFunction.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-prototype-prototype" title="AsyncGeneratorFunction.prototype.prototype"><span class="secnum">27.4.3.2</span> AsyncGeneratorFunction.prototype.prototype</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-prototype-%symbol.tostringtag%" title="AsyncGeneratorFunction.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.4.3.3</span> AsyncGeneratorFunction.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-instances" title="AsyncGeneratorFunction Instances"><span class="secnum">27.4.4</span> AsyncGeneratorFunction Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-instance-length" title="length"><span class="secnum">27.4.4.1</span> length</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-instance-name" title="name"><span class="secnum">27.4.4.2</span> name</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorfunction-instance-prototype" title="prototype"><span class="secnum">27.4.4.3</span> prototype</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-generator-objects" title="Generator Objects"><span class="secnum">27.5</span> Generator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-generator-prototype" title="The %GeneratorPrototype% Object"><span class="secnum">27.5.1</span> The %GeneratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generator.prototype.constructor" title="%GeneratorPrototype%.constructor"><span class="secnum">27.5.1.1</span> %GeneratorPrototype%.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generator.prototype.next" title="%GeneratorPrototype%.next ( value )"><span class="secnum">27.5.1.2</span> %GeneratorPrototype%.next ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generator.prototype.return" title="%GeneratorPrototype%.return ( value )"><span class="secnum">27.5.1.3</span> %GeneratorPrototype%.return ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generator.prototype.throw" title="%GeneratorPrototype%.throw ( exception )"><span class="secnum">27.5.1.4</span> %GeneratorPrototype%.throw ( <var>exception</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generator.prototype-%symbol.tostringtag%" title="%GeneratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">27.5.1.5</span> %GeneratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-properties-of-generator-instances" title="Properties of Generator Instances"><span class="secnum">27.5.2</span> Properties of Generator Instances</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-generator-abstract-operations" title="Generator Abstract Operations"><span class="secnum">27.5.3</span> Generator Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorstart" title="GeneratorStart ( generator, generatorBody )"><span class="secnum">27.5.3.1</span> GeneratorStart ( <var>generator</var>, <var>generatorBody</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorvalidate" title="GeneratorValidate ( generator, generatorBrand )"><span class="secnum">27.5.3.2</span> GeneratorValidate ( <var>generator</var>, <var>generatorBrand</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorresume" title="GeneratorResume ( generator, value, generatorBrand )"><span class="secnum">27.5.3.3</span> GeneratorResume ( <var>generator</var>, <var>value</var>, <var>generatorBrand</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatorresumeabrupt" title="GeneratorResumeAbrupt ( generator, abruptCompletion, generatorBrand )"><span class="secnum">27.5.3.4</span> GeneratorResumeAbrupt ( <var>generator</var>, <var>abruptCompletion</var>, <var>generatorBrand</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-getgeneratorkind" title="GetGeneratorKind ( )"><span class="secnum">27.5.3.5</span> GetGeneratorKind ( )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-generatoryield" title="GeneratorYield ( iteratorResult )"><span class="secnum">27.5.3.6</span> GeneratorYield ( <var>iteratorResult</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-yield" title="Yield ( value )"><span class="secnum">27.5.3.7</span> Yield ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-createiteratorfromclosure" title="CreateIteratorFromClosure ( closure, generatorBrand, generatorPrototype [ , extraSlots ] )"><span class="secnum">27.5.3.8</span> CreateIteratorFromClosure ( <var>closure</var>, <var>generatorBrand</var>, <var>generatorPrototype</var> [ , <var>extraSlots</var> ] )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asyncgenerator-objects" title="AsyncGenerator Objects"><span class="secnum">27.6</span> AsyncGenerator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-properties-of-asyncgenerator-prototype" title="The %AsyncGeneratorPrototype% Object"><span class="secnum">27.6.1</span> The %AsyncGeneratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgenerator-prototype-constructor" title="%AsyncGeneratorPrototype%.constructor"><span class="secnum">27.6.1.1</span> %AsyncGeneratorPrototype%.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgenerator-prototype-next" title="%AsyncGeneratorPrototype%.next ( value )"><span class="secnum">27.6.1.2</span> %AsyncGeneratorPrototype%.next ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgenerator-prototype-return" title="%AsyncGeneratorPrototype%.return ( value )"><span class="secnum">27.6.1.3</span> %AsyncGeneratorPrototype%.return ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgenerator-prototype-throw" title="%AsyncGeneratorPrototype%.throw ( exception )"><span class="secnum">27.6.1.4</span> %AsyncGeneratorPrototype%.throw ( <var>exception</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgenerator-prototype-%symbol.tostringtag%" title="%AsyncGeneratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">27.6.1.5</span> %AsyncGeneratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-properties-of-asyncgenerator-intances" title="Properties of AsyncGenerator Instances"><span class="secnum">27.6.2</span> Properties of AsyncGenerator Instances</a></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-asyncgenerator-abstract-operations" title="AsyncGenerator Abstract Operations"><span class="secnum">27.6.3</span> AsyncGenerator Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorrequest-records" title="AsyncGeneratorRequest Records"><span class="secnum">27.6.3.1</span> AsyncGeneratorRequest Records</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorstart" title="AsyncGeneratorStart ( generator, generatorBody )"><span class="secnum">27.6.3.2</span> AsyncGeneratorStart ( <var>generator</var>, <var>generatorBody</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorvalidate" title="AsyncGeneratorValidate ( generator, generatorBrand )"><span class="secnum">27.6.3.3</span> AsyncGeneratorValidate ( <var>generator</var>, <var>generatorBrand</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorenqueue" title="AsyncGeneratorEnqueue ( generator, completion, promiseCapability )"><span class="secnum">27.6.3.4</span> AsyncGeneratorEnqueue ( <var>generator</var>, <var>completion</var>, <var>promiseCapability</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorcompletestep" title="AsyncGeneratorCompleteStep ( generator, completion, done [ , realm ] )"><span class="secnum">27.6.3.5</span> AsyncGeneratorCompleteStep ( <var>generator</var>, <var>completion</var>, <var>done</var> [ , <var>realm</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorresume" title="AsyncGeneratorResume ( generator, completion )"><span class="secnum">27.6.3.6</span> AsyncGeneratorResume ( <var>generator</var>, <var>completion</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorunwrapyieldresumption" title="AsyncGeneratorUnwrapYieldResumption ( resumptionValue )"><span class="secnum">27.6.3.7</span> AsyncGeneratorUnwrapYieldResumption ( <var>resumptionValue</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratoryield" title="AsyncGeneratorYield ( value )"><span class="secnum">27.6.3.8</span> AsyncGeneratorYield ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratorawaitreturn" title="AsyncGeneratorAwaitReturn ( generator )"><span class="secnum">27.6.3.9</span> AsyncGeneratorAwaitReturn ( <var>generator</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncgeneratordrainqueue" title="AsyncGeneratorDrainQueue ( generator )"><span class="secnum">27.6.3.10</span> AsyncGeneratorDrainQueue ( <var>generator</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-function-objects" title="AsyncFunction Objects"><span class="secnum">27.7</span> AsyncFunction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-function-constructor" title="The AsyncFunction Constructor"><span class="secnum">27.7.1</span> The AsyncFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-constructor-arguments" title="AsyncFunction ( ...parameterArgs, bodyArg )"><span class="secnum">27.7.1.1</span> AsyncFunction ( ...<var>parameterArgs</var>, <var>bodyArg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-function-constructor-properties" title="Properties of the AsyncFunction Constructor"><span class="secnum">27.7.2</span> Properties of the AsyncFunction Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-constructor-prototype" title="AsyncFunction.prototype"><span class="secnum">27.7.2.1</span> AsyncFunction.prototype</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-function-prototype-properties" title="Properties of the AsyncFunction Prototype Object"><span class="secnum">27.7.3</span> Properties of the AsyncFunction Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-prototype-properties-constructor" title="AsyncFunction.prototype.constructor"><span class="secnum">27.7.3.1</span> AsyncFunction.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-prototype-%symbol.tostringtag%" title="AsyncFunction.prototype [ %Symbol.toStringTag% ]"><span class="secnum">27.7.3.2</span> AsyncFunction.prototype [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-function-instances" title="AsyncFunction Instances"><span class="secnum">27.7.4</span> AsyncFunction Instances</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-instances-length" title="length"><span class="secnum">27.7.4.1</span> length</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-function-instances-name" title="name"><span class="secnum">27.7.4.2</span> name</a></li></ol></li><li><span class="item-toggle">+</span><a href="control-abstraction-objects.html#sec-async-functions-abstract-operations" title="Async Functions Abstract Operations"><span class="secnum">27.7.5</span> Async Functions Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-async-functions-abstract-operations-async-function-start" title="AsyncFunctionStart ( promiseCapability, asyncFunctionBody )"><span class="secnum">27.7.5.1</span> AsyncFunctionStart ( <var>promiseCapability</var>, <var>asyncFunctionBody</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#sec-asyncblockstart" title="AsyncBlockStart ( promiseCapability, asyncBody, asyncContext )"><span class="secnum">27.7.5.2</span> AsyncBlockStart ( <var>promiseCapability</var>, <var>asyncBody</var>, <var>asyncContext</var> )</a></li><li><span class="item-toggle-none"></span><a href="control-abstraction-objects.html#await" title="Await ( value )"><span class="secnum">27.7.5.3</span> Await ( <var>value</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="reflection.html#sec-reflection" title="Reflection"><span class="secnum">28</span> Reflection</a><ol class="toc"><li><span class="item-toggle">+</span><a href="reflection.html#sec-reflect-object" title="The Reflect Object"><span class="secnum">28.1</span> The Reflect Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.apply" title="Reflect.apply ( target, thisArgument, argumentsList )"><span class="secnum">28.1.1</span> Reflect.apply ( <var>target</var>, <var>thisArgument</var>, <var>argumentsList</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.construct" title="Reflect.construct ( target, argumentsList [ , newTarget ] )"><span class="secnum">28.1.2</span> Reflect.construct ( <var>target</var>, <var>argumentsList</var> [ , <var>newTarget</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.defineproperty" title="Reflect.defineProperty ( target, propertyKey, attributes )"><span class="secnum">28.1.3</span> Reflect.defineProperty ( <var>target</var>, <var>propertyKey</var>, <var>attributes</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.deleteproperty" title="Reflect.deleteProperty ( target, propertyKey )"><span class="secnum">28.1.4</span> Reflect.deleteProperty ( <var>target</var>, <var>propertyKey</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.get" title="Reflect.get ( target, propertyKey [ , receiver ] )"><span class="secnum">28.1.5</span> Reflect.get ( <var>target</var>, <var>propertyKey</var> [ , <var>receiver</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.getownpropertydescriptor" title="Reflect.getOwnPropertyDescriptor ( target, propertyKey )"><span class="secnum">28.1.6</span> Reflect.getOwnPropertyDescriptor ( <var>target</var>, <var>propertyKey</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.getprototypeof" title="Reflect.getPrototypeOf ( target )"><span class="secnum">28.1.7</span> Reflect.getPrototypeOf ( <var>target</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.has" title="Reflect.has ( target, propertyKey )"><span class="secnum">28.1.8</span> Reflect.has ( <var>target</var>, <var>propertyKey</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.isextensible" title="Reflect.isExtensible ( target )"><span class="secnum">28.1.9</span> Reflect.isExtensible ( <var>target</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.ownkeys" title="Reflect.ownKeys ( target )"><span class="secnum">28.1.10</span> Reflect.ownKeys ( <var>target</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.preventextensions" title="Reflect.preventExtensions ( target )"><span class="secnum">28.1.11</span> Reflect.preventExtensions ( <var>target</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.set" title="Reflect.set ( target, propertyKey, V [ , receiver ] )"><span class="secnum">28.1.12</span> Reflect.set ( <var>target</var>, <var>propertyKey</var>, <var>V</var> [ , <var>receiver</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect.setprototypeof" title="Reflect.setPrototypeOf ( target, proto )"><span class="secnum">28.1.13</span> Reflect.setPrototypeOf ( <var>target</var>, <var>proto</var> )</a></li><li><span class="item-toggle-none"></span><a href="reflection.html#sec-reflect-%symbol.tostringtag%" title="Reflect [ %Symbol.toStringTag% ]"><span class="secnum">28.1.14</span> Reflect [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="reflection.html#sec-proxy-objects" title="Proxy Objects"><span class="secnum">28.2</span> Proxy Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="reflection.html#sec-proxy-constructor" title="The Proxy Constructor"><span class="secnum">28.2.1</span> The Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="reflection.html#sec-proxy-target-handler" title="Proxy ( target, handler )"><span class="secnum">28.2.1.1</span> Proxy ( <var>target</var>, <var>handler</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="reflection.html#sec-properties-of-the-proxy-constructor" title="Properties of the Proxy Constructor"><span class="secnum">28.2.2</span> Properties of the Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="reflection.html#sec-proxy.revocable" title="Proxy.revocable ( target, handler )"><span class="secnum">28.2.2.1</span> Proxy.revocable ( <var>target</var>, <var>handler</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="reflection.html#sec-module-namespace-objects" title="Module Namespace Objects"><span class="secnum">28.3</span> Module Namespace Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="reflection.html#sec-%symbol.tostringtag%" title="%Symbol.toStringTag%"><span class="secnum">28.3.1</span> %Symbol.toStringTag%</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="memory-model.html#sec-memory-model" title="Memory Model"><span class="secnum">29</span> Memory Model</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-memory-model-fundamentals" title="Memory Model Fundamentals"><span class="secnum">29.1</span> Memory Model Fundamentals</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-agent-event-records" title="Agent Events Records"><span class="secnum">29.2</span> Agent Events Records</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-chosen-value-records" title="Chosen Value Records"><span class="secnum">29.3</span> Chosen Value Records</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-candidate-executions" title="Candidate Executions"><span class="secnum">29.4</span> Candidate Executions</a></li><li><span class="item-toggle">+</span><a href="memory-model.html#sec-abstract-operations-for-the-memory-model" title="Abstract Operations for the Memory Model"><span class="secnum">29.5</span> Abstract Operations for the Memory Model</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-event-set" title="EventSet ( execution )"><span class="secnum">29.5.1</span> EventSet ( <var>execution</var> )</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-sharedatablockeventset" title="SharedDataBlockEventSet ( execution )"><span class="secnum">29.5.2</span> SharedDataBlockEventSet ( <var>execution</var> )</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-hosteventset" title="HostEventSet ( execution )"><span class="secnum">29.5.3</span> HostEventSet ( <var>execution</var> )</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-composewriteeventbytes" title="ComposeWriteEventBytes ( execution, byteIndex, Ws )"><span class="secnum">29.5.4</span> ComposeWriteEventBytes ( <var>execution</var>, <var>byteIndex</var>, <var>Ws</var> )</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-valueofreadevent" title="ValueOfReadEvent ( execution, R )"><span class="secnum">29.5.5</span> ValueOfReadEvent ( <var>execution</var>, <var>R</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="memory-model.html#sec-relations-of-candidate-executions" title="Relations of Candidate Executions"><span class="secnum">29.6</span> Relations of Candidate Executions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-agent-order" title="is-agent-order-before"><span class="secnum">29.6.1</span> is-agent-order-before</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-reads-bytes-from" title="reads-bytes-from"><span class="secnum">29.6.2</span> reads-bytes-from</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-reads-from" title="reads-from"><span class="secnum">29.6.3</span> reads-from</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-host-synchronizes-with" title="host-synchronizes-with"><span class="secnum">29.6.4</span> host-synchronizes-with</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-synchronizes-with" title="synchronizes-with"><span class="secnum">29.6.5</span> synchronizes-with</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-happens-before" title="happens-before"><span class="secnum">29.6.6</span> happens-before</a></li></ol></li><li><span class="item-toggle">+</span><a href="memory-model.html#sec-properties-of-valid-executions" title="Properties of Valid Executions"><span class="secnum">29.7</span> Properties of Valid Executions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-valid-chosen-reads" title="Valid Chosen Reads"><span class="secnum">29.7.1</span> Valid Chosen Reads</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-coherent-reads" title="Coherent Reads"><span class="secnum">29.7.2</span> Coherent Reads</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-tear-free-aligned-reads" title="Tear Free Reads"><span class="secnum">29.7.3</span> Tear Free Reads</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-memory-order" title="Sequentially Consistent Atomics"><span class="secnum">29.7.4</span> Sequentially Consistent Atomics</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-valid-executions" title="Valid Executions"><span class="secnum">29.7.5</span> Valid Executions</a></li></ol></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-races" title="Races"><span class="secnum">29.8</span> Races</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-data-races" title="Data Races"><span class="secnum">29.9</span> Data Races</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-data-race-freedom" title="Data Race Freedom"><span class="secnum">29.10</span> Data Race Freedom</a></li><li><span class="item-toggle-none"></span><a href="memory-model.html#sec-shared-memory-guidelines" title="Shared Memory Guidelines"><span class="secnum">29.11</span> Shared Memory Guidelines</a></li></ol></li><li><span class="item-toggle">+</span><a href="grammar-summary.html#sec-grammar-summary" title="Grammar Summary"><span class="secnum">Annex A <span class="annex-kind">(informative)</span></span> Grammar Summary</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-lexical-grammar" title="Lexical Grammar"><span class="secnum">A.1</span> Lexical Grammar</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-expressions" title="Expressions"><span class="secnum">A.2</span> Expressions</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-statements" title="Statements"><span class="secnum">A.3</span> Statements</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-functions-and-classes" title="Functions and Classes"><span class="secnum">A.4</span> Functions and Classes</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-scripts-and-modules" title="Scripts and Modules"><span class="secnum">A.5</span> Scripts and Modules</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-number-conversions" title="Number Conversions"><span class="secnum">A.6</span> Number Conversions</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-time-zone-offset-string-format" title="Time Zone Offset String Format"><span class="secnum">A.7</span> Time Zone Offset String Format</a></li><li><span class="item-toggle-none"></span><a href="grammar-summary.html#sec-regular-expressions" title="Regular Expressions"><span class="secnum">A.8</span> Regular Expressions</a></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-ecmascript-features-for-web-browsers" title="Additional ECMAScript Features for Web Browsers"><span class="secnum">Annex B <span class="annex-kind">(normative)</span></span> Additional ECMAScript Features for Web Browsers</a><ol class="toc"><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-syntax" title="Additional Syntax"><span class="secnum">B.1</span> Additional Syntax</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-html-like-comments" title="HTML-like Comments"><span class="secnum">B.1.1</span> HTML-like Comments</a></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-regular-expressions-patterns" title="Regular Expressions Patterns"><span class="secnum">B.1.2</span> Regular Expressions Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-patterns-static-semantics-early-errors-annexb" title="Static Semantics: Early Errors"><span class="secnum">B.1.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-countleftcapturingparens-annexb" title="Static Semantics: CountLeftCapturingParensWithin and CountLeftCapturingParensBefore"><span class="secnum">B.1.2.2</span> SS: CountLeftCapturingParensWithin and CountLeftCapturingParensBefore</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-patterns-static-semantics-is-character-class-annexb" title="Static Semantics: IsCharacterClass"><span class="secnum">B.1.2.3</span> SS: IsCharacterClass</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-patterns-static-semantics-character-value-annexb" title="Static Semantics: CharacterValue"><span class="secnum">B.1.2.4</span> SS: CharacterValue</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-compilesubpattern-annexb" title="Runtime Semantics: CompileSubpattern"><span class="secnum">B.1.2.5</span> RS: CompileSubpattern</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-compileassertion-annexb" title="Runtime Semantics: CompileAssertion"><span class="secnum">B.1.2.6</span> RS: CompileAssertion</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-compileatom-annexb" title="Runtime Semantics: CompileAtom"><span class="secnum">B.1.2.7</span> RS: CompileAtom</a></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-compiletocharset-annexb" title="Runtime Semantics: CompileToCharSet"><span class="secnum">B.1.2.8</span> RS: CompileToCharSet</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-runtime-semantics-characterrangeorunion-abstract-operation" title="CharacterRangeOrUnion ( rer, A, B )"><span class="secnum">B.1.2.8.1</span> CharacterRangeOrUnion ( <var>rer</var>, <var>A</var>, <var>B</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-parsepattern-annexb" title="Static Semantics: ParsePattern ( patternText, u, v )"><span class="secnum">B.1.2.9</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-built-in-properties" title="Additional Built-in Properties"><span class="secnum">B.2</span> Additional Built-in Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-properties-of-the-global-object" title="Additional Properties of the Global Object"><span class="secnum">B.2.1</span> Additional Properties of the Global Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-escape-string" title="escape ( string )"><span class="secnum">B.2.1.1</span> escape ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-unescape-string" title="unescape ( string )"><span class="secnum">B.2.1.2</span> unescape ( <var>string</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-properties-of-the-string.prototype-object" title="Additional Properties of the String.prototype Object"><span class="secnum">B.2.2</span> Additional Properties of the String.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.substr" title="String.prototype.substr ( start, length )"><span class="secnum">B.2.2.1</span> String.prototype.substr ( <var>start</var>, <var>length</var> )</a></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.anchor" title="String.prototype.anchor ( name )"><span class="secnum">B.2.2.2</span> String.prototype.anchor ( <var>name</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-createhtml" title="CreateHTML ( string, tag, attribute, value )"><span class="secnum">B.2.2.2.1</span> CreateHTML ( <var>string</var>, <var>tag</var>, <var>attribute</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.big" title="String.prototype.big ( )"><span class="secnum">B.2.2.3</span> String.prototype.big ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.blink" title="String.prototype.blink ( )"><span class="secnum">B.2.2.4</span> String.prototype.blink ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.bold" title="String.prototype.bold ( )"><span class="secnum">B.2.2.5</span> String.prototype.bold ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.fixed" title="String.prototype.fixed ( )"><span class="secnum">B.2.2.6</span> String.prototype.fixed ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.fontcolor" title="String.prototype.fontcolor ( colour )"><span class="secnum">B.2.2.7</span> String.prototype.fontcolor ( <var>colour</var> )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.fontsize" title="String.prototype.fontsize ( size )"><span class="secnum">B.2.2.8</span> String.prototype.fontsize ( <var>size</var> )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.italics" title="String.prototype.italics ( )"><span class="secnum">B.2.2.9</span> String.prototype.italics ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.link" title="String.prototype.link ( url )"><span class="secnum">B.2.2.10</span> String.prototype.link ( <var>url</var> )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.small" title="String.prototype.small ( )"><span class="secnum">B.2.2.11</span> String.prototype.small ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.strike" title="String.prototype.strike ( )"><span class="secnum">B.2.2.12</span> String.prototype.strike ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.sub" title="String.prototype.sub ( )"><span class="secnum">B.2.2.13</span> String.prototype.sub ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-string.prototype.sup" title="String.prototype.sup ( )"><span class="secnum">B.2.2.14</span> String.prototype.sup ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#String.prototype.trimleft" title="String.prototype.trimLeft ( )"><span class="secnum">B.2.2.15</span> String.prototype.trimLeft ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#String.prototype.trimright" title="String.prototype.trimRight ( )"><span class="secnum">B.2.2.16</span> String.prototype.trimRight ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-properties-of-the-date.prototype-object" title="Additional Properties of the Date.prototype Object"><span class="secnum">B.2.3</span> Additional Properties of the Date.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-date.prototype.getyear" title="Date.prototype.getYear ( )"><span class="secnum">B.2.3.1</span> Date.prototype.getYear ( )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-date.prototype.setyear" title="Date.prototype.setYear ( year )"><span class="secnum">B.2.3.2</span> Date.prototype.setYear ( <var>year</var> )</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-date.prototype.togmtstring" title="Date.prototype.toGMTString ( )"><span class="secnum">B.2.3.3</span> Date.prototype.toGMTString ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-additional-properties-of-the-regexp.prototype-object" title="Additional Properties of the RegExp.prototype Object"><span class="secnum">B.2.4</span> Additional Properties of the RegExp.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-regexp.prototype.compile" title="RegExp.prototype.compile ( pattern, flags )"><span class="secnum">B.2.4.1</span> RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="additional-ecmascript-features-for-web-browsers.html#sec-other-additional-features" title="Other Additional Features"><span class="secnum">B.3</span> Other Additional Features</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-labelled-function-declarations" title="Labelled Function Declarations"><span class="secnum">B.3.1</span> Labelled Function Declarations</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-block-level-function-declarations-web-legacy-compatibility-semantics" title="Block-Level Function Declarations Web Legacy Compatibility Semantics"><span class="secnum">B.3.2</span> Block-Level Function Declarations Web Legacy Compatibility Semantics</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-functiondeclarations-in-ifstatement-statement-clauses" title="FunctionDeclarations in IfStatement Statement Clauses"><span class="secnum">B.3.3</span> FunctionDeclarations in IfStatement Statement Clauses</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-variablestatements-in-catch-blocks" title="VariableStatements in Catch Blocks"><span class="secnum">B.3.4</span> VariableStatements in Catch Blocks</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-initializers-in-forin-statement-heads" title="Initializers in ForIn Statement Heads"><span class="secnum">B.3.5</span> Initializers in ForIn Statement Heads</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-IsHTMLDDA-internal-slot" title="The [[IsHTMLDDA]] Internal Slot"><span class="secnum">B.3.6</span> The <var class="field">[[IsHTMLDDA]]</var> Internal Slot</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-web-compat-host-make-job-callback" title="Non-default behaviour in HostMakeJobCallback"><span class="secnum">B.3.7</span> Non-default behaviour in HostMakeJobCallback</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-web-compat-host-ensure-can-add-private-field" title="Non-default behaviour in HostEnsureCanAddPrivateElement"><span class="secnum">B.3.8</span> Non-default behaviour in HostEnsureCanAddPrivateElement</a></li><li><span class="item-toggle-none"></span><a href="additional-ecmascript-features-for-web-browsers.html#sec-runtime-errors-for-function-call-assignment-targets" title="Runtime Errors for Function Call Assignment Targets"><span class="secnum">B.3.9</span> Runtime Errors for Function Call Assignment Targets</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="strict-mode-of-ecmascript.html#sec-strict-mode-of-ecmascript" title="The Strict Mode of ECMAScript"><span class="secnum">Annex C <span class="annex-kind">(informative)</span></span> The Strict Mode of ECMAScript</a></li><li><span class="item-toggle">+</span><a href="host-layering-points.html#sec-host-layering-points" title="Host Layering Points"><span class="secnum">Annex D <span class="annex-kind">(informative)</span></span> Host Layering Points</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-hooks-summary" title="Host Hooks"><span class="secnum">D.1</span> Host Hooks</a></li><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-defined-fields-summary" title="Host-defined Fields"><span class="secnum">D.2</span> Host-defined Fields</a></li><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-defined-objects-summary" title="Host-defined Objects"><span class="secnum">D.3</span> Host-defined Objects</a></li><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-running-jobs" title="Running Jobs"><span class="secnum">D.4</span> Running Jobs</a></li><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-internal-methods-of-exotic-objects" title="Internal Methods of Exotic Objects"><span class="secnum">D.5</span> Internal Methods of Exotic Objects</a></li><li><span class="item-toggle-none"></span><a href="host-layering-points.html#sec-host-built-in-objects-and-methods" title="Built-in Objects and Methods"><span class="secnum">D.6</span> Built-in Objects and Methods</a></li></ol></li><li><span class="item-toggle-none"></span><a href="corrections-and-clarifications-in-ecmascript-2015-with-possible-compatibility-impact.html#sec-corrections-and-clarifications-in-ecmascript-2015-with-possible-compatibility-impact" title="Corrections and Clarifications in ECMAScript 2015 with Possible Compatibility Impact"><span class="secnum">Annex E <span class="annex-kind">(informative)</span></span> Corrections and Clarifications in ECMAScript 2015 with Possible Compatibility Impact</a></li><li><span class="item-toggle-none"></span><a href="additions-and-changes-that-introduce-incompatibilities-with-prior-editions.html#sec-additions-and-changes-that-introduce-incompatibilities-with-prior-editions" title="Additions and Changes That Introduce Incompatibilities with Prior Editions"><span class="secnum">Annex F <span class="annex-kind">(informative)</span></span> Additions and Changes That Introduce Incompatibilities with Prior Editions</a></li><li><span class="item-toggle-none"></span><a href="bibliography.html#sec-bibliography" title="Bibliography">Bibliography</a></li><li><span class="item-toggle-none"></span><a href="colophon.html#sec-colophon" title="Colophon">Colophon</a></li><li><span class="item-toggle-none"></span><a href="copyright-and-software-license.html#sec-copyright-and-software-license" title="Copyright &amp; Software License">Copyright &amp; Software License</a></li></ol></div></div>
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<h1><span class="secnum">25</span> Structured Data</h1>
<emu-clause id="sec-arraybuffer-objects">
<h1><span class="secnum">25.1</span> ArrayBuffer Objects</h1>
<emu-clause id="sec-arraybuffer-notation">
<h1><span class="secnum">25.1.1</span> Notation</h1>
<p>The descriptions below in this section, <emu-xref href="#sec-atomics-object" id="_ref_786"><a href="structured-data.html#sec-atomics-object">25.4</a></emu-xref>, and <emu-xref href="#sec-memory-model" id="_ref_787"><a href="memory-model.html#sec-memory-model">29</a></emu-xref> use the read-modify-write modification function internal data structure.</p>
<p>A <dfn variants="read-modify-write modification functions" tabindex="-1">read-modify-write modification function</dfn> is a mathematical function that is represented as an abstract closure that takes two <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14512"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">Lists</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_14513"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref> as arguments and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14514"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_14515"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. These abstract closures satisfy all of the following properties:</p>
<ul>
<li>They perform all their algorithm steps atomically.</li>
<li>Their individual algorithm steps are not observable.</li>
</ul>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>To aid verifying that a read-modify-write modification function's algorithm steps constitute a pure, mathematical function, the following editorial conventions are recommended:</p>
<ul>
<li>They do not access, directly or transitively via invoked <emu-xref href="#sec-algorithm-conventions-abstract-operations" id="_ref_14516"><a href="notational-conventions.html#sec-algorithm-conventions-abstract-operations">abstract operations</a></emu-xref> and abstract closures, any language or specification values except their parameters and captured values.</li>
<li>They do not invoke, directly or transitively, <emu-xref href="#sec-algorithm-conventions-abstract-operations" id="_ref_14517"><a href="notational-conventions.html#sec-algorithm-conventions-abstract-operations">abstract operations</a></emu-xref> and abstract closures that return <emu-xref href="#sec-completion-record-specification-type" id="_ref_14518"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">Completion Records</a></emu-xref>.</li>
<li>They do not return <emu-xref href="#sec-completion-record-specification-type" id="_ref_14519"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">Completion Records</a></emu-xref>.</li>
</ul>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-fixed-length-and-resizable-arraybuffer-objects">
<h1><span class="secnum">25.1.2</span> Fixed-length and Resizable ArrayBuffer Objects</h1>
<p>A <dfn tabindex="-1">fixed-length ArrayBuffer</dfn> is an ArrayBuffer whose byte length cannot change after creation.</p>
<p>A <dfn tabindex="-1">resizable ArrayBuffer</dfn> is an ArrayBuffer whose byte length may change after creation via calls to <emu-xref href="#sec-arraybuffer.prototype.resize" title="" id="_ref_788"><a href="structured-data.html#sec-arraybuffer.prototype.resize">ArrayBuffer.prototype.resize ( <var>newLength</var> )</a></emu-xref>.</p>
<p>The kind of ArrayBuffer object that is created depends on the arguments passed to <emu-xref href="#sec-arraybuffer-length" title="" id="_ref_789"><a href="structured-data.html#sec-arraybuffer-length">ArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</a></emu-xref>.</p>
</emu-clause>
<emu-clause id="sec-abstract-operations-for-arraybuffer-objects">
<h1><span class="secnum">25.1.3</span> Abstract Operations For ArrayBuffer Objects</h1>
<emu-clause id="sec-allocatearraybuffer" type="abstract operation" aoid="AllocateArrayBuffer">
<h1><span class="secnum">25.1.3.1</span> AllocateArrayBuffer ( <var>constructor</var>, <var>byteLength</var> [ , <var>maxByteLength</var> ] )</h1>
<p>The abstract operation AllocateArrayBuffer takes arguments <var>constructor</var> (a <emu-xref href="#constructor" id="_ref_14520"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>) and <var>byteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14521"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and optional argument <var>maxByteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14522"><a href="notational-conventions.html#integer">integer</a></emu-xref> or <emu-const>empty</emu-const>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14523"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an ArrayBuffer or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14524"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It is used to create an ArrayBuffer. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>slots</var> be « <var class="field">[[ArrayBufferData]]</var>, <var class="field">[[ArrayBufferByteLength]]</var>, <var class="field">[[ArrayBufferDetachKey]]</var>&nbsp;».</li><li>If <var>maxByteLength</var> is present and <var>maxByteLength</var> is not <emu-const>empty</emu-const>, let <var>allocatingResizableBuffer</var> be <emu-val>true</emu-val>; else let <var>allocatingResizableBuffer</var> be <emu-val>false</emu-val>.</li><li>If <var>allocatingResizableBuffer</var> is <emu-val>true</emu-val>, then<ol><li>If <var>byteLength</var> &gt; <var>maxByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Append <var class="field">[[ArrayBufferMaxByteLength]]</var> to <var>slots</var>.</li></ol></li><li>Let <var>obj</var> be ?&nbsp;<emu-xref aoid="OrdinaryCreateFromConstructor" id="_ref_14525"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycreatefromconstructor" class="e-user-code">OrdinaryCreateFromConstructor</a></emu-xref>(<var>constructor</var>, <emu-val>"%ArrayBuffer.prototype%"</emu-val>, <var>slots</var>).</li><li>Let <var>block</var> be ?&nbsp;<emu-xref aoid="CreateByteDataBlock" id="_ref_14526"><a href="ecmascript-data-types-and-values.html#sec-createbytedatablock">CreateByteDataBlock</a></emu-xref>(<var>byteLength</var>).</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferData]]</var> to <var>block</var>.</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferByteLength]]</var> to <var>byteLength</var>.</li><li>If <var>allocatingResizableBuffer</var> is <emu-val>true</emu-val>, then<ol><li>If it is not possible to create a <emu-xref href="#sec-data-blocks" id="_ref_14527"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> <var>block</var> consisting of <var>maxByteLength</var> bytes, throw a <emu-val>RangeError</emu-val> exception.</li><li>NOTE: Resizable ArrayBuffers are designed to be implementable with in-place growth. Implementations may throw if, for example, virtual memory cannot be reserved up front.</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var> to <var>maxByteLength</var>.</li></ol></li><li>Return <var>obj</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybufferbytelength" type="abstract operation" aoid="ArrayBufferByteLength">
<h1><span class="secnum">25.1.3.2</span> ArrayBufferByteLength ( <var>arrayBuffer</var>, <var>order</var> )</h1>
<p>The abstract operation ArrayBufferByteLength takes arguments <var>arrayBuffer</var> (an ArrayBuffer or SharedArrayBuffer) and <var>order</var> (<emu-const>seq-cst</emu-const> or <emu-const>unordered</emu-const>) and returns a non-negative <emu-xref href="#integer" id="_ref_14528"><a href="notational-conventions.html#integer">integer</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <emu-xref aoid="IsGrowableSharedArrayBuffer" id="_ref_14529"><a href="structured-data.html#sec-isgrowablesharedarraybuffer">IsGrowableSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>bufferByteLengthBlock</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferByteLengthData]]</var>.</li><li>Let <var>rawLength</var> be <emu-xref aoid="GetRawBytesFromSharedBlock" id="_ref_14530"><a href="structured-data.html#sec-getrawbytesfromsharedblock">GetRawBytesFromSharedBlock</a></emu-xref>(<var>bufferByteLengthBlock</var>, 0, <emu-const>biguint64</emu-const>, <emu-val>true</emu-val>, <var>order</var>).</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14531"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14532"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Return <emu-xref aoid="ℝ" id="_ref_14533"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(<emu-xref aoid="RawBytesToNumeric" id="_ref_14534"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<emu-const>biguint64</emu-const>, <var>rawLength</var>, <var>isLittleEndian</var>)).</li></ol></li><li><emu-xref href="#assert" id="_ref_14535"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsDetachedBuffer" id="_ref_14536"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>.</li><li>Return <var>arrayBuffer</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffercopyanddetach" type="abstract operation" aoid="ArrayBufferCopyAndDetach">
<h1><span class="secnum">25.1.3.3</span> ArrayBufferCopyAndDetach ( <var>arrayBuffer</var>, <var>newLength</var>, <var>preserveResizability</var> )</h1>
<p>The abstract operation ArrayBufferCopyAndDetach takes arguments <var>arrayBuffer</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14537"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>newLength</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14538"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>preserveResizability</var> (<emu-const>preserve-resizability</emu-const> or <emu-const>fixed-length</emu-const>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14539"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an ArrayBuffer or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14540"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14541"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>arrayBuffer</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14542"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>newLength</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>newByteLength</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>newByteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14543"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>newLength</var>).</li></ol></li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14544"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>preserveResizability</var> is <emu-const>preserve-resizability</emu-const> and <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14545"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>, then<ol><li>Let <var>newMaxByteLength</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>newMaxByteLength</var> be <emu-const>empty</emu-const>.</li></ol></li><li>If <var>arrayBuffer</var>.<var class="field">[[ArrayBufferDetachKey]]</var> is not <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>newBuffer</var> be ?&nbsp;<emu-xref aoid="AllocateArrayBuffer" id="_ref_14546"><a href="structured-data.html#sec-allocatearraybuffer">AllocateArrayBuffer</a></emu-xref>(<emu-xref href="#sec-arraybuffer-constructor" id="_ref_14547"><a href="structured-data.html#sec-arraybuffer-constructor">%ArrayBuffer%</a></emu-xref>, <var>newByteLength</var>, <var>newMaxByteLength</var>).</li><li>Let <var>copyLength</var> be <emu-xref aoid="min" id="_ref_14548"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>newByteLength</var>, <var>arrayBuffer</var>.<var class="field">[[ArrayBufferByteLength]]</var>).</li><li>Let <var>fromBlock</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>toBlock</var> be <var>newBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Perform <emu-xref aoid="CopyDataBlockBytes" id="_ref_14549"><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes">CopyDataBlockBytes</a></emu-xref>(<var>toBlock</var>, 0, <var>fromBlock</var>, 0, <var>copyLength</var>).</li><li>NOTE: Neither creation of the new <emu-xref href="#sec-data-blocks" id="_ref_14550"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> nor copying from the old <emu-xref href="#sec-data-blocks" id="_ref_14551"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> are observable. Implementations may implement this method as a zero-copy move or a <code>realloc</code>.</li><li>Perform !&nbsp;<emu-xref aoid="DetachArrayBuffer" id="_ref_14552"><a href="structured-data.html#sec-detacharraybuffer">DetachArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>).</li><li>Return <var>newBuffer</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isdetachedbuffer" type="abstract operation" aoid="IsDetachedBuffer">
<h1><span class="secnum">25.1.3.4</span> IsDetachedBuffer ( <var>arrayBuffer</var> )</h1>
<p>The abstract operation IsDetachedBuffer takes argument <var>arrayBuffer</var> (an ArrayBuffer or a SharedArrayBuffer) and returns a Boolean. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var> is <emu-val>null</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-detacharraybuffer" type="abstract operation" aoid="DetachArrayBuffer">
<h1><span class="secnum">25.1.3.5</span> DetachArrayBuffer ( <var>arrayBuffer</var> [ , <var>key</var> ] )</h1>
<p>The abstract operation DetachArrayBuffer takes argument <var>arrayBuffer</var> (an ArrayBuffer) and optional argument <var>key</var> (anything) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14553"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> <emu-const>unused</emu-const> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14554"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14555"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14556"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>.</li><li>If <var>key</var> is not present, set <var>key</var> to <emu-val>undefined</emu-val>.</li><li>If <var>arrayBuffer</var>.<var class="field">[[ArrayBufferDetachKey]]</var> is not <var>key</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Set <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var> to <emu-val>null</emu-val>.</li><li>Set <var>arrayBuffer</var>.<var class="field">[[ArrayBufferByteLength]]</var> to 0.</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>Detaching an ArrayBuffer instance disassociates the <emu-xref href="#sec-data-blocks" id="_ref_14557"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> used as its backing store from the instance and sets the byte length of the buffer to 0.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-clonearraybuffer" type="abstract operation" aoid="CloneArrayBuffer">
<h1><span class="secnum">25.1.3.6</span> CloneArrayBuffer ( <var>srcBuffer</var>, <var>srcByteOffset</var>, <var>srcLength</var> )</h1>
<p>The abstract operation CloneArrayBuffer takes arguments <var>srcBuffer</var> (an ArrayBuffer or a SharedArrayBuffer), <var>srcByteOffset</var> (a non-negative <emu-xref href="#integer" id="_ref_14558"><a href="notational-conventions.html#integer">integer</a></emu-xref>), and <var>srcLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14559"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14560"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an ArrayBuffer or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14561"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It creates a new ArrayBuffer whose data is a copy of <var>srcBuffer</var>'s data over the range starting at <var>srcByteOffset</var> and continuing for <var>srcLength</var> bytes. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14562"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsDetachedBuffer" id="_ref_14563"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>srcBuffer</var>) is <emu-val>false</emu-val>.</li><li>Let <var>targetBuffer</var> be ?&nbsp;<emu-xref aoid="AllocateArrayBuffer" id="_ref_14564"><a href="structured-data.html#sec-allocatearraybuffer">AllocateArrayBuffer</a></emu-xref>(<emu-xref href="#sec-arraybuffer-constructor" id="_ref_14565"><a href="structured-data.html#sec-arraybuffer-constructor">%ArrayBuffer%</a></emu-xref>, <var>srcLength</var>).</li><li>Let <var>srcBlock</var> be <var>srcBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>targetBlock</var> be <var>targetBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Perform <emu-xref aoid="CopyDataBlockBytes" id="_ref_14566"><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes">CopyDataBlockBytes</a></emu-xref>(<var>targetBlock</var>, 0, <var>srcBlock</var>, <var>srcByteOffset</var>, <var>srcLength</var>).</li><li>Return <var>targetBuffer</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getarraybuffermaxbytelengthoption" type="abstract operation" aoid="GetArrayBufferMaxByteLengthOption">
<h1><span class="secnum">25.1.3.7</span> GetArrayBufferMaxByteLengthOption ( <var>options</var> )</h1>
<p>The abstract operation GetArrayBufferMaxByteLengthOption takes argument <var>options</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14567"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14568"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either a non-negative <emu-xref href="#integer" id="_ref_14569"><a href="notational-conventions.html#integer">integer</a></emu-xref> or <emu-const>empty</emu-const>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14570"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>options</var> <emu-xref href="#sec-object-type" id="_ref_14571"><a href="ecmascript-data-types-and-values.html#sec-object-type">is not an Object</a></emu-xref>, return <emu-const>empty</emu-const>.</li><li>Let <var>maxByteLength</var> be ?&nbsp;<emu-xref aoid="Get" id="_ref_14572"><a href="abstract-operations.html#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>options</var>, <emu-val>"maxByteLength"</emu-val>).</li><li>If <var>maxByteLength</var> is <emu-val>undefined</emu-val>, return <emu-const>empty</emu-const>.</li><li>Return ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14573"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>maxByteLength</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-hostresizearraybuffer" type="host-defined abstract operation" aoid="HostResizeArrayBuffer">
<h1><span class="secnum">25.1.3.8</span> HostResizeArrayBuffer ( <var>buffer</var>, <var>newByteLength</var> )</h1>
<p>The <emu-xref href="#host-defined" id="_ref_14574"><a href="overview.html#host-defined">host-defined</a></emu-xref> abstract operation HostResizeArrayBuffer takes arguments <var>buffer</var> (an ArrayBuffer) and <var>newByteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14575"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14576"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either <emu-const>handled</emu-const> or <emu-const>unhandled</emu-const>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14577"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It gives the <emu-xref href="#host" id="_ref_14578"><a href="overview.html#host">host</a></emu-xref> an opportunity to perform <emu-xref href="#implementation-defined" id="_ref_14579"><a href="overview.html#implementation-defined">implementation-defined</a></emu-xref> resizing of <var>buffer</var>. If the <emu-xref href="#host" id="_ref_14580"><a href="overview.html#host">host</a></emu-xref> chooses not to handle resizing of <var>buffer</var>, it may return <emu-const>unhandled</emu-const> for the default behaviour.</p>
<p>The implementation of HostResizeArrayBuffer must conform to the following requirements:</p>
<ul>
<li>The abstract operation does not detach <var>buffer</var>.</li>
<li>If the abstract operation completes normally with <emu-const>handled</emu-const>, <var>buffer</var>.<var class="field">[[ArrayBufferByteLength]]</var> is <var>newByteLength</var>.</li>
</ul>
<p>The default implementation of HostResizeArrayBuffer is to return <emu-xref aoid="NormalCompletion" id="_ref_14581"><a href="ecmascript-data-types-and-values.html#sec-normalcompletion">NormalCompletion</a></emu-xref>(<emu-const>unhandled</emu-const>).</p>
</emu-clause>
<emu-clause id="sec-isfixedlengtharraybuffer" type="abstract operation" aoid="IsFixedLengthArrayBuffer">
<h1><span class="secnum">25.1.3.9</span> IsFixedLengthArrayBuffer ( <var>arrayBuffer</var> )</h1>
<p>The abstract operation IsFixedLengthArrayBuffer takes argument <var>arrayBuffer</var> (an ArrayBuffer or a SharedArrayBuffer) and returns a Boolean. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>arrayBuffer</var> has an <var class="field">[[ArrayBufferMaxByteLength]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isunsignedelementtype" type="abstract operation" aoid="IsUnsignedElementType">
<h1><span class="secnum">25.1.3.10</span> IsUnsignedElementType ( <var>type</var> )</h1>
<p>The abstract operation IsUnsignedElementType takes argument <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14582"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>) and returns a Boolean. It verifies if the argument <var>type</var> is an unsigned <emu-xref href="#sec-typedarray-objects" id="_ref_14583"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>type</var> is one of <emu-const>uint8</emu-const>, <emu-const>uint8clamped</emu-const>, <emu-const>uint16</emu-const>, <emu-const>uint32</emu-const>, or <emu-const>biguint64</emu-const>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isunclampedintegerelementtype" type="abstract operation" aoid="IsUnclampedIntegerElementType">
<h1><span class="secnum">25.1.3.11</span> IsUnclampedIntegerElementType ( <var>type</var> )</h1>
<p>The abstract operation IsUnclampedIntegerElementType takes argument <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14584"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>) and returns a Boolean. It verifies if the argument <var>type</var> is an <emu-xref href="#integer" id="_ref_14585"><a href="notational-conventions.html#integer">Integer</a></emu-xref> <emu-xref href="#sec-typedarray-objects" id="_ref_14586"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref> not including <emu-const>uint8clamped</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>type</var> is one of <emu-const>int8</emu-const>, <emu-const>uint8</emu-const>, <emu-const>int16</emu-const>, <emu-const>uint16</emu-const>, <emu-const>int32</emu-const>, or <emu-const>uint32</emu-const>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isbigintelementtype" type="abstract operation" aoid="IsBigIntElementType">
<h1><span class="secnum">25.1.3.12</span> IsBigIntElementType ( <var>type</var> )</h1>
<p>The abstract operation IsBigIntElementType takes argument <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14587"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>) and returns a Boolean. It verifies if the argument <var>type</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_14588"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref> <emu-xref href="#sec-typedarray-objects" id="_ref_14589"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>type</var> is either <emu-const>biguint64</emu-const> or <emu-const>bigint64</emu-const>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isnotearconfiguration" type="abstract operation" aoid="IsNoTearConfiguration">
<h1><span class="secnum">25.1.3.13</span> IsNoTearConfiguration ( <var>type</var>, <var>order</var> )</h1>
<p>The abstract operation IsNoTearConfiguration takes arguments <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14590"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>) and <var>order</var> (<emu-const>seq-cst</emu-const>, <emu-const>unordered</emu-const>, or <emu-const>init</emu-const>) and returns a Boolean. It performs the following steps when called:</p>
<emu-alg><ol><li>If <emu-xref aoid="IsUnclampedIntegerElementType" id="_ref_14591"><a href="structured-data.html#sec-isunclampedintegerelementtype">IsUnclampedIntegerElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>, return <emu-val>true</emu-val>.</li><li>If <emu-xref aoid="IsBigIntElementType" id="_ref_14592"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val> and <var>order</var> is neither <emu-const>init</emu-const> nor <emu-const>unordered</emu-const>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-rawbytestonumeric" type="abstract operation" oldids="sec-rawbytestonumber" aoid="RawBytesToNumeric"><span id="sec-rawbytestonumber"></span>
<h1><span class="secnum">25.1.3.14</span> RawBytesToNumeric ( <var>type</var>, <var>rawBytes</var>, <var>isLittleEndian</var> )</h1>
<p>The abstract operation RawBytesToNumeric takes arguments <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14593"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>rawBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14594"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_14595"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>), and <var>isLittleEndian</var> (a Boolean) and returns a Number or a BigInt. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_790"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>If <var>isLittleEndian</var> is <emu-val>false</emu-val>, reverse the order of the elements of <var>rawBytes</var>.</li><li>If <var>type</var> is <emu-const>float16</emu-const>, then<ol><li>Let <var>value</var> be the byte elements of <var>rawBytes</var> concatenated and interpreted as a little-endian bit string encoding of an <emu-xref href="#sec-bibliography" id="_ref_14596"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary16 value.</li><li>If <var>value</var> is a NaN, return <emu-val>NaN</emu-val>.</li><li>Return the Number value that corresponds to <var>value</var>.</li></ol></li><li>If <var>type</var> is <emu-const>float32</emu-const>, then<ol><li>Let <var>value</var> be the byte elements of <var>rawBytes</var> concatenated and interpreted as a little-endian bit string encoding of an <emu-xref href="#sec-bibliography" id="_ref_14597"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary32 value.</li><li>If <var>value</var> is a NaN, return <emu-val>NaN</emu-val>.</li><li>Return the Number value that corresponds to <var>value</var>.</li></ol></li><li>If <var>type</var> is <emu-const>float64</emu-const>, then<ol><li>Let <var>value</var> be the byte elements of <var>rawBytes</var> concatenated and interpreted as a little-endian bit string encoding of an <emu-xref href="#sec-bibliography" id="_ref_14598"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary64 value.</li><li>If <var>value</var> is a NaN, return <emu-val>NaN</emu-val>.</li><li>Return the Number value that corresponds to <var>value</var>.</li></ol></li><li>If <emu-xref aoid="IsUnsignedElementType" id="_ref_14599"><a href="structured-data.html#sec-isunsignedelementtype">IsUnsignedElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>intValue</var> be the byte elements of <var>rawBytes</var> concatenated and interpreted as a bit string encoding of an unsigned little-endian binary number.</li></ol></li><li>Else,<ol><li>Let <var>intValue</var> be the byte elements of <var>rawBytes</var> concatenated and interpreted as a bit string encoding of a binary little-endian two's complement number of bit length <var>elementSize</var> × 8.</li></ol></li><li>If <emu-xref aoid="IsBigIntElementType" id="_ref_14600"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>, return the BigInt value that corresponds to <var>intValue</var>.</li><li>Return the Number value that corresponds to <var>intValue</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getrawbytesfromsharedblock" type="abstract operation" aoid="GetRawBytesFromSharedBlock">
<h1><span class="secnum">25.1.3.15</span> GetRawBytesFromSharedBlock ( <var>block</var>, <var>byteIndex</var>, <var>type</var>, <var>isTypedArray</var>, <var>order</var> )</h1>
<p>The abstract operation GetRawBytesFromSharedBlock takes arguments <var>block</var> (a <emu-xref href="#sec-data-blocks" id="_ref_14601"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref>), <var>byteIndex</var> (a non-negative <emu-xref href="#integer" id="_ref_14602"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14603"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>isTypedArray</var> (a Boolean), and <var>order</var> (<emu-const>seq-cst</emu-const> or <emu-const>unordered</emu-const>) and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14604"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_14605"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_791"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14606"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14607"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_14608"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_14609"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>If <var>isTypedArray</var> is <emu-val>true</emu-val> and <emu-xref aoid="IsNoTearConfiguration" id="_ref_14610"><a href="structured-data.html#sec-isnotearconfiguration">IsNoTearConfiguration</a></emu-xref>(<var>type</var>, <var>order</var>) is <emu-val>true</emu-val>, let <var>noTear</var> be <emu-val>true</emu-val>; else let <var>noTear</var> be <emu-val>false</emu-val>.</li><li>Let <var>rawValue</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14611"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of length <var>elementSize</var> whose elements are nondeterministically chosen <emu-xref href="#sec-data-blocks" id="_ref_14612"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>.</li><li>NOTE: In implementations, <var>rawValue</var> is the result of a non-atomic or atomic read instruction on the underlying hardware. The nondeterminism is a semantic prescription of the <emu-xref href="#sec-memory-model" id="_ref_14613"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref> to describe observable behaviour of hardware with weak consistency.</li><li>Let <var>readEvent</var> be <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14614"><a href="memory-model.html#sec-memory-model-fundamentals">ReadSharedMemory</a></emu-xref> { <var class="field">[[Order]]</var>: <var>order</var>, <var class="field">[[NoTear]]</var>: <var>noTear</var>, <var class="field">[[Block]]</var>: <var>block</var>, <var class="field">[[ByteIndex]]</var>: <var>byteIndex</var>, <var class="field">[[ElementSize]]</var>: <var>elementSize</var>&nbsp;}.</li><li>Append <var>readEvent</var> to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li><li>Append <emu-xref href="#sec-chosen-value-records" id="_ref_14615"><a href="memory-model.html#sec-chosen-value-records">Chosen Value Record</a></emu-xref> { <var class="field">[[Event]]</var>: <var>readEvent</var>, <var class="field">[[ChosenValue]]</var>: <var>rawValue</var>&nbsp;} to <var>execution</var>.<var class="field">[[ChosenValues]]</var>.</li><li>Return <var>rawValue</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getvaluefrombuffer" type="abstract operation" aoid="GetValueFromBuffer">
<h1><span class="secnum">25.1.3.16</span> GetValueFromBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>isTypedArray</var>, <var>order</var> [ , <var>isLittleEndian</var> ] )</h1>
<p>The abstract operation GetValueFromBuffer takes arguments <var>arrayBuffer</var> (an ArrayBuffer or SharedArrayBuffer), <var>byteIndex</var> (a non-negative <emu-xref href="#integer" id="_ref_14616"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14617"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>isTypedArray</var> (a Boolean), and <var>order</var> (<emu-const>seq-cst</emu-const> or <emu-const>unordered</emu-const>) and optional argument <var>isLittleEndian</var> (a Boolean) and returns a Number or a BigInt. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14618"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsDetachedBuffer" id="_ref_14619"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>.</li><li><emu-xref href="#assert" id="_ref_14620"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: There are sufficient bytes in <var>arrayBuffer</var> starting at <var>byteIndex</var> to represent a value of <var>type</var>.</li><li>Let <var>block</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_792"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14621"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, then<ol><li><emu-xref href="#assert" id="_ref_14622"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>block</var> is a <emu-xref href="#sec-data-blocks" id="_ref_14623"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref>.</li><li>Let <var>rawValue</var> be <emu-xref aoid="GetRawBytesFromSharedBlock" id="_ref_14624"><a href="structured-data.html#sec-getrawbytesfromsharedblock">GetRawBytesFromSharedBlock</a></emu-xref>(<var>block</var>, <var>byteIndex</var>, <var>type</var>, <var>isTypedArray</var>, <var>order</var>).</li></ol></li><li>Else,<ol><li>Let <var>rawValue</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14625"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are bytes from <var>block</var> at indices in the <emu-xref href="#interval" id="_ref_14626"><a href="notational-conventions.html#interval">interval</a></emu-xref> from <var>byteIndex</var> (inclusive) to <var>byteIndex</var> + <var>elementSize</var> (exclusive).</li></ol></li><li><emu-xref href="#assert" id="_ref_14627"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The number of elements in <var>rawValue</var> is <var>elementSize</var>.</li><li>If <var>isLittleEndian</var> is not present, then<ol><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14628"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14629"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Set <var>isLittleEndian</var> to <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li></ol></li><li>Return <emu-xref aoid="RawBytesToNumeric" id="_ref_14630"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>rawValue</var>, <var>isLittleEndian</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-numerictorawbytes" type="abstract operation" oldids="sec-numbertorawbytes" aoid="NumericToRawBytes"><span id="sec-numbertorawbytes"></span>
<h1><span class="secnum">25.1.3.17</span> NumericToRawBytes ( <var>type</var>, <var>value</var>, <var>isLittleEndian</var> )</h1>
<p>The abstract operation NumericToRawBytes takes arguments <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14631"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>value</var> (a Number or a BigInt), and <var>isLittleEndian</var> (a Boolean) and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14632"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_14633"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>type</var> is <emu-const>float16</emu-const>, then<ol><li>Let <var>rawBytes</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14634"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the 2 bytes that are the result of converting <var>value</var> to <emu-xref href="#sec-bibliography" id="_ref_14635"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary16 format using roundTiesToEven mode. The bytes are arranged in little endian order. If <var>value</var> is <emu-val>NaN</emu-val>, <var>rawBytes</var> may be set to any implementation chosen <emu-xref href="#sec-bibliography" id="_ref_14636"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary16 format NaN encoding. An implementation must always choose the same encoding for each implementation distinguishable <emu-val>NaN</emu-val> value.</li></ol></li><li>Else if <var>type</var> is <emu-const>float32</emu-const>, then<ol><li>Let <var>rawBytes</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14637"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the 4 bytes that are the result of converting <var>value</var> to <emu-xref href="#sec-bibliography" id="_ref_14638"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary32 format using roundTiesToEven mode. The bytes are arranged in little endian order. If <var>value</var> is <emu-val>NaN</emu-val>, <var>rawBytes</var> may be set to any implementation chosen <emu-xref href="#sec-bibliography" id="_ref_14639"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary32 format NaN encoding. An implementation must always choose the same encoding for each implementation distinguishable <emu-val>NaN</emu-val> value.</li></ol></li><li>Else if <var>type</var> is <emu-const>float64</emu-const>, then<ol><li>Let <var>rawBytes</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14640"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the 8 bytes that are the <emu-xref href="#sec-bibliography" id="_ref_14641"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary64 format encoding of <var>value</var>. The bytes are arranged in little endian order. If <var>value</var> is <emu-val>NaN</emu-val>, <var>rawBytes</var> may be set to any implementation chosen <emu-xref href="#sec-bibliography" id="_ref_14642"><a href="bibliography.html#sec-bibliography">IEEE 754-2019</a></emu-xref> binary64 format NaN encoding. An implementation must always choose the same encoding for each implementation distinguishable <emu-val>NaN</emu-val> value.</li></ol></li><li>Else,<ol><li>Let <var>n</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_793"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>Let <var>conversionOperation</var> be the abstract operation named in the “Conversion Operation” column of <emu-xref href="#table-the-typedarray-constructors" id="_ref_794"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>Let <var>intValue</var> be <emu-xref aoid="ℝ" id="_ref_14643"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(! <var>conversionOperation</var>(<var>value</var>)).</li><li>If <var>intValue</var> ≥ 0, then<ol><li>Let <var>rawBytes</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14644"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the <var>n</var>-byte binary encoding of <var>intValue</var>. The bytes are ordered in little endian order.</li></ol></li><li>Else,<ol><li>Let <var>rawBytes</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14645"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the <var>n</var>-byte binary two's complement encoding of <var>intValue</var>. The bytes are ordered in little endian order.</li></ol></li></ol></li><li>If <var>isLittleEndian</var> is <emu-val>false</emu-val>, reverse the order of the elements of <var>rawBytes</var>.</li><li>Return <var>rawBytes</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-setvalueinbuffer" type="abstract operation" aoid="SetValueInBuffer">
<h1><span class="secnum">25.1.3.18</span> SetValueInBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>value</var>, <var>isTypedArray</var>, <var>order</var> [ , <var>isLittleEndian</var> ] )</h1>
<p>The abstract operation SetValueInBuffer takes arguments <var>arrayBuffer</var> (an ArrayBuffer or SharedArrayBuffer), <var>byteIndex</var> (a non-negative <emu-xref href="#integer" id="_ref_14646"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14647"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>value</var> (a Number or a BigInt), <var>isTypedArray</var> (a Boolean), and <var>order</var> (<emu-const>seq-cst</emu-const>, <emu-const>unordered</emu-const>, or <emu-const>init</emu-const>) and optional argument <var>isLittleEndian</var> (a Boolean) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14648"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsDetachedBuffer" id="_ref_14649"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>.</li><li><emu-xref href="#assert" id="_ref_14650"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: There are sufficient bytes in <var>arrayBuffer</var> starting at <var>byteIndex</var> to represent a value of <var>type</var>.</li><li><emu-xref href="#assert" id="_ref_14651"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>value</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_14652"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref> if <emu-xref aoid="IsBigIntElementType" id="_ref_14653"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>; else, <var>value</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_14654"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>.</li><li>Let <var>block</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_795"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14655"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14656"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>If <var>isLittleEndian</var> is not present, then<ol><li>Set <var>isLittleEndian</var> to <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li></ol></li><li>Let <var>rawBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_14657"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>type</var>, <var>value</var>, <var>isLittleEndian</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14658"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_14659"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_14660"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>If <var>isTypedArray</var> is <emu-val>true</emu-val> and <emu-xref aoid="IsNoTearConfiguration" id="_ref_14661"><a href="structured-data.html#sec-isnotearconfiguration">IsNoTearConfiguration</a></emu-xref>(<var>type</var>, <var>order</var>) is <emu-val>true</emu-val>, let <var>noTear</var> be <emu-val>true</emu-val>; else let <var>noTear</var> be <emu-val>false</emu-val>.</li><li>Append <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14662"><a href="memory-model.html#sec-memory-model-fundamentals">WriteSharedMemory</a></emu-xref> { <var class="field">[[Order]]</var>: <var>order</var>, <var class="field">[[NoTear]]</var>: <var>noTear</var>, <var class="field">[[Block]]</var>: <var>block</var>, <var class="field">[[ByteIndex]]</var>: <var>byteIndex</var>, <var class="field">[[ElementSize]]</var>: <var>elementSize</var>, <var class="field">[[Payload]]</var>: <var>rawBytes</var>&nbsp;} to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li></ol></li><li>Else,<ol><li>Store the individual bytes of <var>rawBytes</var> into <var>block</var>, starting at <var>block</var>[<var>byteIndex</var>].</li></ol></li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getmodifysetvalueinbuffer" type="abstract operation" aoid="GetModifySetValueInBuffer">
<h1><span class="secnum">25.1.3.19</span> GetModifySetValueInBuffer ( <var>arrayBuffer</var>, <var>byteIndex</var>, <var>type</var>, <var>value</var>, <var>op</var> )</h1>
<p>The abstract operation GetModifySetValueInBuffer takes arguments <var>arrayBuffer</var> (an ArrayBuffer or a SharedArrayBuffer), <var>byteIndex</var> (a non-negative <emu-xref href="#integer" id="_ref_14663"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14664"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), <var>value</var> (a Number or a BigInt), and <var>op</var> (a <emu-xref href="#sec-arraybuffer-notation" id="_ref_14665"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref>) and returns a Number or a BigInt. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14666"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsDetachedBuffer" id="_ref_14667"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>false</emu-val>.</li><li><emu-xref href="#assert" id="_ref_14668"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: There are sufficient bytes in <var>arrayBuffer</var> starting at <var>byteIndex</var> to represent a value of <var>type</var>.</li><li><emu-xref href="#assert" id="_ref_14669"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>value</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_14670"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref> if <emu-xref aoid="IsBigIntElementType" id="_ref_14671"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>; else, <var>value</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_14672"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>.</li><li>Let <var>block</var> be <var>arrayBuffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_796"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14673"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14674"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Let <var>rawBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_14675"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>type</var>, <var>value</var>, <var>isLittleEndian</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14676"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>arrayBuffer</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_14677"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_14678"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>Let <var>rawBytesRead</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14679"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of length <var>elementSize</var> whose elements are nondeterministically chosen <emu-xref href="#sec-data-blocks" id="_ref_14680"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>.</li><li>NOTE: In implementations, <var>rawBytesRead</var> is the result of a load-link, of a load-exclusive, or of an operand of a read-modify-write instruction on the underlying hardware. The nondeterminism is a semantic prescription of the <emu-xref href="#sec-memory-model" id="_ref_14681"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref> to describe observable behaviour of hardware with weak consistency.</li><li>Let <var>rmwEvent</var> be <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14682"><a href="memory-model.html#sec-memory-model-fundamentals">ReadModifyWriteSharedMemory</a></emu-xref> { <var class="field">[[Order]]</var>: <emu-const>seq-cst</emu-const>, <var class="field">[[NoTear]]</var>: <emu-val>true</emu-val>, <var class="field">[[Block]]</var>: <var>block</var>, <var class="field">[[ByteIndex]]</var>: <var>byteIndex</var>, <var class="field">[[ElementSize]]</var>: <var>elementSize</var>, <var class="field">[[Payload]]</var>: <var>rawBytes</var>, <var class="field">[[ModifyOp]]</var>: <var>op</var>&nbsp;}.</li><li>Append <var>rmwEvent</var> to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li><li>Append <emu-xref href="#sec-chosen-value-records" id="_ref_14683"><a href="memory-model.html#sec-chosen-value-records">Chosen Value Record</a></emu-xref> { <var class="field">[[Event]]</var>: <var>rmwEvent</var>, <var class="field">[[ChosenValue]]</var>: <var>rawBytesRead</var>&nbsp;} to <var>execution</var>.<var class="field">[[ChosenValues]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>rawBytesRead</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14684"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of length <var>elementSize</var> whose elements are the sequence of <var>elementSize</var> bytes starting with <var>block</var>[<var>byteIndex</var>].</li><li>Let <var>rawBytesModified</var> be <var>op</var>(<var>rawBytesRead</var>, <var>rawBytes</var>).</li><li>Store the individual bytes of <var>rawBytesModified</var> into <var>block</var>, starting at <var>block</var>[<var>byteIndex</var>].</li></ol></li><li>Return <emu-xref aoid="RawBytesToNumeric" id="_ref_14685"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>rawBytesRead</var>, <var>isLittleEndian</var>).</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-arraybuffer-constructor">
<h1><span class="secnum">25.1.4</span> The ArrayBuffer Constructor</h1>
<p>The ArrayBuffer <emu-xref href="#constructor" id="_ref_14686"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>is <dfn tabindex="-1">%ArrayBuffer%</dfn>.</li>
<li>is the initial value of the <emu-val>"ArrayBuffer"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_14687"><a href="global-object.html#sec-global-object">global object</a></emu-xref>.</li>
<li>creates and initializes a new ArrayBuffer when called as a <emu-xref href="#constructor" id="_ref_14688"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>.</li>
<li>is not intended to be called as a function and will throw an exception when called in that manner.</li>
<li>may be used as the value of an <code>extends</code> clause of a class definition. Subclass <emu-xref href="#constructor" id="_ref_14689"><a href="ecmascript-data-types-and-values.html#constructor">constructors</a></emu-xref> that intend to inherit the specified ArrayBuffer behaviour must include a <code>super</code> call to the ArrayBuffer <emu-xref href="#constructor" id="_ref_14690"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> to create and initialize subclass instances with the internal state necessary to support the <code>ArrayBuffer.prototype</code> built-in methods.</li>
</ul>
<emu-clause id="sec-arraybuffer-length" type="built-in function">
<h1><span class="secnum">25.1.4.1</span> ArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>byteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14691"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>length</var>).</li><li>Let <var>requestedMaxByteLength</var> be ?&nbsp;<emu-xref aoid="GetArrayBufferMaxByteLengthOption" id="_ref_14692"><a href="structured-data.html#sec-getarraybuffermaxbytelengthoption" class="e-user-code">GetArrayBufferMaxByteLengthOption</a></emu-xref>(<var>options</var>).</li><li>Return ?&nbsp;<emu-xref aoid="AllocateArrayBuffer" id="_ref_14693"><a href="structured-data.html#sec-allocatearraybuffer" class="e-user-code">AllocateArrayBuffer</a></emu-xref>(NewTarget, <var>byteLength</var>, <var>requestedMaxByteLength</var>).</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-arraybuffer-constructor">
<h1><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</h1>
<p>The ArrayBuffer <emu-xref href="#constructor" id="_ref_14694"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-function-prototype-object" id="_ref_14695"><a href="fundamental-objects.html#sec-properties-of-the-function-prototype-object">%Function.prototype%</a></emu-xref>.</li>
<li>has the following properties:</li>
</ul>
<emu-clause id="sec-arraybuffer.isview" type="built-in function">
<h1><span class="secnum">25.1.5.1</span> ArrayBuffer.isView ( <var>arg</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>If <var>arg</var> <emu-xref href="#sec-object-type" id="_ref_14696"><a href="ecmascript-data-types-and-values.html#sec-object-type">is not an Object</a></emu-xref>, return <emu-val>false</emu-val>.</li><li>If <var>arg</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype">
<h1><span class="secnum">25.1.5.2</span> ArrayBuffer.prototype</h1>
<p>The initial value of <code>ArrayBuffer.prototype</code> is the <emu-xref href="#sec-properties-of-the-arraybuffer-prototype-object" id="_ref_14697"><a href="structured-data.html#sec-properties-of-the-arraybuffer-prototype-object">ArrayBuffer prototype object</a></emu-xref>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>false</emu-val> }.</p>
</emu-clause>
<emu-clause oldids="sec-get-arraybuffer-@@species" id="sec-get-arraybuffer-%symbol.species%" type="built-in function"><span id="sec-get-arraybuffer-@@species"></span>
<h1><span class="secnum">25.1.5.3</span> get ArrayBuffer [ %Symbol.species% ]</h1>
<p><code>ArrayBuffer[%Symbol.species%]</code> is an <emu-xref href="#sec-object-type" id="_ref_14698"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Return the <emu-val>this</emu-val> value.</li></ol></emu-alg>
<p>The value of the <emu-val>"name"</emu-val> property of this function is <emu-val>"get [Symbol.species]"</emu-val>.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p><emu-xref href="#sec-arraybuffer.prototype.slice" title="" id="_ref_797"><a href="structured-data.html#sec-arraybuffer.prototype.slice">ArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</a></emu-xref> normally uses its <emu-val>this</emu-val> value's <emu-xref href="#constructor" id="_ref_14699"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> to create a derived object. However, a subclass <emu-xref href="#constructor" id="_ref_14700"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> may over-ride that default behaviour for the <emu-xref href="#sec-arraybuffer.prototype.slice" title="" id="_ref_798"><a href="structured-data.html#sec-arraybuffer.prototype.slice">ArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</a></emu-xref> method by redefining its <emu-xref href="#sec-well-known-symbols" id="_ref_14701"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.species%</a></emu-xref> property.</p>
</div></emu-note>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-arraybuffer-prototype-object">
<h1><span class="secnum">25.1.6</span> Properties of the ArrayBuffer Prototype Object</h1>
<p>The <dfn tabindex="-1">ArrayBuffer prototype object</dfn>:</p>
<ul>
<li>is <dfn tabindex="-1">%ArrayBuffer.prototype%</dfn>.</li>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_14702"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>.</li>
<li>is an <emu-xref href="#ordinary-object" id="_ref_14703"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary object</a></emu-xref>.</li>
<li>does not have an <var class="field">[[ArrayBufferData]]</var> or <var class="field">[[ArrayBufferByteLength]]</var> internal slot.</li>
</ul>
<emu-clause id="sec-get-arraybuffer.prototype.bytelength" type="built-in function">
<h1><span class="secnum">25.1.6.1</span> get ArrayBuffer.prototype.byteLength</h1>
<p><code>ArrayBuffer.prototype.byteLength</code> is an <emu-xref href="#sec-object-type" id="_ref_14704"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14705"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14706"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14707"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, return <emu-val>+0</emu-val><sub>𝔽</sub>.</li><li>Let <var>length</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li><li>Return <emu-xref aoid="𝔽" id="_ref_14708"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>length</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype.constructor">
<h1><span class="secnum">25.1.6.2</span> ArrayBuffer.prototype.constructor</h1>
<p>The initial value of <code>ArrayBuffer.prototype.constructor</code> is <emu-xref href="#sec-arraybuffer-constructor" id="_ref_14709"><a href="structured-data.html#sec-arraybuffer-constructor">%ArrayBuffer%</a></emu-xref>.</p>
</emu-clause>
<emu-clause id="sec-get-arraybuffer.prototype.detached" type="built-in function">
<h1><span class="secnum">25.1.6.3</span> get ArrayBuffer.prototype.detached</h1>
<p><code>ArrayBuffer.prototype.detached</code> is an <emu-xref href="#sec-object-type" id="_ref_14710"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14711"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14712"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return <emu-xref aoid="IsDetachedBuffer" id="_ref_14713"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-get-arraybuffer.prototype.maxbytelength" type="built-in function">
<h1><span class="secnum">25.1.6.4</span> get ArrayBuffer.prototype.maxByteLength</h1>
<p><code>ArrayBuffer.prototype.maxByteLength</code> is an <emu-xref href="#sec-object-type" id="_ref_14714"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14715"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14716"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14717"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, return <emu-val>+0</emu-val><sub>𝔽</sub>.</li><li>If <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14718"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>length</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>length</var> be <var>O</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>.</li></ol></li><li>Return <emu-xref aoid="𝔽" id="_ref_14719"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>length</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-get-arraybuffer.prototype.resizable" type="built-in function">
<h1><span class="secnum">25.1.6.5</span> get ArrayBuffer.prototype.resizable</h1>
<p><code>ArrayBuffer.prototype.resizable</code> is an <emu-xref href="#sec-object-type" id="_ref_14720"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14721"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14722"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14723"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype.resize" type="built-in function">
<h1><span class="secnum">25.1.6.6</span> ArrayBuffer.prototype.resize ( <var>newLength</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14724"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferMaxByteLength]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14725"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>newByteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14726"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>newLength</var>).</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14727"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>newByteLength</var> &gt; <var>O</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>hostHandled</var> be ?&nbsp;<emu-xref aoid="HostResizeArrayBuffer" id="_ref_14728"><a href="structured-data.html#sec-hostresizearraybuffer">HostResizeArrayBuffer</a></emu-xref>(<var>O</var>, <var>newByteLength</var>).</li><li>If <var>hostHandled</var> is <emu-const>handled</emu-const>, return <emu-val>undefined</emu-val>.</li><li>Let <var>oldBlock</var> be <var>O</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>newBlock</var> be ?&nbsp;<emu-xref aoid="CreateByteDataBlock" id="_ref_14729"><a href="ecmascript-data-types-and-values.html#sec-createbytedatablock">CreateByteDataBlock</a></emu-xref>(<var>newByteLength</var>).</li><li>Let <var>copyLength</var> be <emu-xref aoid="min" id="_ref_14730"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>newByteLength</var>, <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>).</li><li>Perform <emu-xref aoid="CopyDataBlockBytes" id="_ref_14731"><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes">CopyDataBlockBytes</a></emu-xref>(<var>newBlock</var>, 0, <var>oldBlock</var>, 0, <var>copyLength</var>).</li><li>NOTE: Neither creation of the new <emu-xref href="#sec-data-blocks" id="_ref_14732"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> nor copying from the old <emu-xref href="#sec-data-blocks" id="_ref_14733"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Data Block</a></emu-xref> are observable. Implementations may implement this method as in-place growth or shrinkage.</li><li>Set <var>O</var>.<var class="field">[[ArrayBufferData]]</var> to <var>newBlock</var>.</li><li>Set <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var> to <var>newByteLength</var>.</li><li>Return <emu-val>undefined</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype.slice" type="built-in function">
<h1><span class="secnum">25.1.6.7</span> ArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14734"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14735"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14736"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>len</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li><li>Let <var>relativeStart</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_14737"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>start</var>).</li><li>If <var>relativeStart</var> = -∞, let <var>first</var> be 0.</li><li>Else if <var>relativeStart</var> &lt; 0, let <var>first</var> be <emu-xref aoid="max" id="_ref_14738"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>len</var> + <var>relativeStart</var>, 0).</li><li>Else, let <var>first</var> be <emu-xref aoid="min" id="_ref_14739"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>relativeStart</var>, <var>len</var>).</li><li>If <var>end</var> is <emu-val>undefined</emu-val>, let <var>relativeEnd</var> be <var>len</var>; else let <var>relativeEnd</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_14740"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>end</var>).</li><li>If <var>relativeEnd</var> = -∞, let <var>final</var> be 0.</li><li>Else if <var>relativeEnd</var> &lt; 0, let <var>final</var> be <emu-xref aoid="max" id="_ref_14741"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>len</var> + <var>relativeEnd</var>, 0).</li><li>Else, let <var>final</var> be <emu-xref aoid="min" id="_ref_14742"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>relativeEnd</var>, <var>len</var>).</li><li>Let <var>newLen</var> be <emu-xref aoid="max" id="_ref_14743"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>final</var> - <var>first</var>, 0).</li><li>Let <var>ctor</var> be ?&nbsp;<emu-xref aoid="SpeciesConstructor" id="_ref_14744"><a href="abstract-operations.html#sec-speciesconstructor" class="e-user-code">SpeciesConstructor</a></emu-xref>(<var>O</var>, <emu-xref href="#sec-arraybuffer-constructor" id="_ref_14745"><a href="structured-data.html#sec-arraybuffer-constructor">%ArrayBuffer%</a></emu-xref>).</li><li>Let <var>new</var> be ?&nbsp;<emu-xref aoid="Construct" id="_ref_14746"><a href="abstract-operations.html#sec-construct" class="e-user-code">Construct</a></emu-xref>(<var>ctor</var>, « <emu-xref aoid="𝔽" id="_ref_14747"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>newLen</var>)&nbsp;»).</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14748"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>new</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14749"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>new</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14750"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>new</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="SameValue" id="_ref_14751"><a href="abstract-operations.html#sec-samevalue">SameValue</a></emu-xref>(<var>new</var>, <var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>new</var>.<var class="field">[[ArrayBufferByteLength]]</var> &lt; <var>newLen</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>NOTE: Side-effects of the above steps may have detached or resized <var>O</var>.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14752"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>fromBuf</var> be <var>O</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>toBuf</var> be <var>new</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>currentLen</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li><li>If <var>first</var> &lt; <var>currentLen</var>, then<ol><li>Let <var>count</var> be <emu-xref aoid="min" id="_ref_14753"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>newLen</var>, <var>currentLen</var> - <var>first</var>).</li><li>Perform <emu-xref aoid="CopyDataBlockBytes" id="_ref_14754"><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes">CopyDataBlockBytes</a></emu-xref>(<var>toBuf</var>, 0, <var>fromBuf</var>, <var>first</var>, <var>count</var>).</li></ol></li><li>Return <var>new</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype.transfer" type="built-in function">
<h1><span class="secnum">25.1.6.8</span> ArrayBuffer.prototype.transfer ( [ <var>newLength</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="ArrayBufferCopyAndDetach" id="_ref_14755"><a href="structured-data.html#sec-arraybuffercopyanddetach" class="e-user-code">ArrayBufferCopyAndDetach</a></emu-xref>(<var>O</var>, <var>newLength</var>, <emu-const>preserve-resizability</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-arraybuffer.prototype.transfertofixedlength" type="built-in function">
<h1><span class="secnum">25.1.6.9</span> ArrayBuffer.prototype.transferToFixedLength ( [ <var>newLength</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="ArrayBufferCopyAndDetach" id="_ref_14756"><a href="structured-data.html#sec-arraybuffercopyanddetach" class="e-user-code">ArrayBufferCopyAndDetach</a></emu-xref>(<var>O</var>, <var>newLength</var>, <emu-const>fixed-length</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause oldids="sec-arraybuffer.prototype-@@tostringtag" id="sec-arraybuffer.prototype-%symbol.tostringtag%"><span id="sec-arraybuffer.prototype-@@tostringtag"></span>
<h1><span class="secnum">25.1.6.10</span> ArrayBuffer.prototype [ %Symbol.toStringTag% ]</h1>
<p>The initial value of the <emu-xref href="#sec-well-known-symbols" id="_ref_14757"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.toStringTag%</a></emu-xref> property is the String value <emu-val>"ArrayBuffer"</emu-val>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>true</emu-val> }.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-arraybuffer-instances">
<h1><span class="secnum">25.1.7</span> Properties of ArrayBuffer Instances</h1>
<p>ArrayBuffer instances inherit properties from the <emu-xref href="#sec-properties-of-the-arraybuffer-prototype-object" id="_ref_14758"><a href="structured-data.html#sec-properties-of-the-arraybuffer-prototype-object">ArrayBuffer prototype object</a></emu-xref>. ArrayBuffer instances each have an <var class="field">[[ArrayBufferData]]</var> internal slot, an <var class="field">[[ArrayBufferByteLength]]</var> internal slot, and an <var class="field">[[ArrayBufferDetachKey]]</var> internal slot. ArrayBuffer instances which are resizable each have an <var class="field">[[ArrayBufferMaxByteLength]]</var> internal slot.</p>
<p>ArrayBuffer instances whose <var class="field">[[ArrayBufferData]]</var> is <emu-val>null</emu-val> are considered to be detached and all operators to access or modify data contained in the ArrayBuffer instance will fail.</p>
<p>ArrayBuffer instances whose <var class="field">[[ArrayBufferDetachKey]]</var> is set to a value other than <emu-val>undefined</emu-val> need to have all <emu-xref aoid="DetachArrayBuffer" id="_ref_14759"><a href="structured-data.html#sec-detacharraybuffer">DetachArrayBuffer</a></emu-xref> calls passing that same "detach key" as an argument, otherwise a TypeError will result. This internal slot is only ever set by certain embedding environments, not by algorithms in this specification.</p>
</emu-clause>
<emu-clause id="sec-resizable-arraybuffer-guidelines">
<h1><span class="secnum">25.1.8</span> Resizable ArrayBuffer Guidelines</h1>
<emu-note><span class="note">Note 1</span><div class="note-contents">
<p>The following are guidelines for ECMAScript programmers working with <emu-xref href="#sec-fixed-length-and-resizable-arraybuffer-objects" id="_ref_14760"><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects">resizable ArrayBuffer</a></emu-xref>.</p>
<p>We recommend that programs be tested in their deployment environments where possible. The amount of available physical memory differs greatly between hardware devices. Similarly, virtual memory subsystems also differ greatly between hardware devices as well as operating systems. An application that runs without out-of-memory errors on a 64-bit desktop web browser could run out of memory on a 32-bit mobile web browser.</p>
<p>When choosing a value for the <emu-val>"maxByteLength"</emu-val> option for <emu-xref href="#sec-fixed-length-and-resizable-arraybuffer-objects" id="_ref_14761"><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects">resizable ArrayBuffer</a></emu-xref>, we recommend that the smallest possible size for the application be chosen. We recommend that <emu-val>"maxByteLength"</emu-val> does not exceed 1,073,741,824 (2<sup>30</sup> bytes or 1GiB).</p>
<p>Please note that successfully constructing a <emu-xref href="#sec-fixed-length-and-resizable-arraybuffer-objects" id="_ref_14762"><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects">resizable ArrayBuffer</a></emu-xref> for a particular maximum size does not guarantee that future resizes will succeed.</p>
</div></emu-note>
<emu-note><span class="note">Note 2</span><div class="note-contents">
<p>The following are guidelines for ECMAScript implementers implementing <emu-xref href="#sec-fixed-length-and-resizable-arraybuffer-objects" id="_ref_14763"><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects">resizable ArrayBuffer</a></emu-xref>.</p>
<p><emu-xref href="#sec-fixed-length-and-resizable-arraybuffer-objects" id="_ref_14764"><a href="structured-data.html#sec-fixed-length-and-resizable-arraybuffer-objects">Resizable ArrayBuffer</a></emu-xref> can be implemented as copying upon resize, as in-place growth via reserving virtual memory up front, or as a combination of both for different values of the <emu-xref href="#constructor" id="_ref_14765"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>'s <emu-val>"maxByteLength"</emu-val> option.</p>
<p>If a <emu-xref href="#host" id="_ref_14766"><a href="overview.html#host">host</a></emu-xref> is multi-tenanted (i.e. it runs many ECMAScript applications simultaneously), such as a web browser, and its implementations choose to implement in-place growth by reserving virtual memory, we recommend that both 32-bit and 64-bit implementations throw for values of <emu-val>"maxByteLength"</emu-val> ≥ 1GiB to 1.5GiB. This is to reduce the likelihood a single application can exhaust the virtual memory address space and to reduce interoperability risk.</p>
<p>If a <emu-xref href="#host" id="_ref_14767"><a href="overview.html#host">host</a></emu-xref> does not have virtual memory, such as those running on embedded devices without an MMU, or if a <emu-xref href="#host" id="_ref_14768"><a href="overview.html#host">host</a></emu-xref> only implements resizing by copying, it may accept any <emu-not-ref>Number value for</emu-not-ref> the <emu-val>"maxByteLength"</emu-val> option. However, we recommend a <emu-val>RangeError</emu-val> be thrown if a memory block of the requested size can never be allocated. For example, if the requested size is greater than the maximum amount of usable memory on the device.</p>
</div></emu-note>
</emu-clause>
</emu-clause>
<emu-clause id="sec-sharedarraybuffer-objects">
<h1><span class="secnum">25.2</span> SharedArrayBuffer Objects</h1>
<emu-clause id="sec-fixed-length-and-growable-sharedarraybuffer-objects">
<h1><span class="secnum">25.2.1</span> Fixed-length and Growable SharedArrayBuffer Objects</h1>
<p>A <dfn tabindex="-1">fixed-length SharedArrayBuffer</dfn> is a SharedArrayBuffer whose byte length cannot change after creation.</p>
<p>A <dfn tabindex="-1">growable SharedArrayBuffer</dfn> is a SharedArrayBuffer whose byte length may increase after creation via calls to <emu-xref href="#sec-sharedarraybuffer.prototype.grow" title="" id="_ref_799"><a href="structured-data.html#sec-sharedarraybuffer.prototype.grow">SharedArrayBuffer.prototype.grow ( <var>newLength</var> )</a></emu-xref>.</p>
<p>The kind of SharedArrayBuffer object that is created depends on the arguments passed to <emu-xref href="#sec-sharedarraybuffer-length" title="" id="_ref_800"><a href="structured-data.html#sec-sharedarraybuffer-length">SharedArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</a></emu-xref>.</p>
</emu-clause>
<emu-clause id="sec-abstract-operations-for-sharedarraybuffer-objects">
<h1><span class="secnum">25.2.2</span> Abstract Operations for SharedArrayBuffer Objects</h1>
<emu-clause id="sec-allocatesharedarraybuffer" type="abstract operation" aoid="AllocateSharedArrayBuffer">
<h1><span class="secnum">25.2.2.1</span> AllocateSharedArrayBuffer ( <var>constructor</var>, <var>byteLength</var> [ , <var>maxByteLength</var> ] )</h1>
<p>The abstract operation AllocateSharedArrayBuffer takes arguments <var>constructor</var> (a <emu-xref href="#constructor" id="_ref_14769"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>) and <var>byteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14770"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and optional argument <var>maxByteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14771"><a href="notational-conventions.html#integer">integer</a></emu-xref> or <emu-const>empty</emu-const>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14772"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a SharedArrayBuffer or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14773"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It is used to create a SharedArrayBuffer. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>slots</var> be « <var class="field">[[ArrayBufferData]]</var>&nbsp;».</li><li>If <var>maxByteLength</var> is present and <var>maxByteLength</var> is not <emu-const>empty</emu-const>, let <var>allocatingGrowableBuffer</var> be <emu-val>true</emu-val>; else let <var>allocatingGrowableBuffer</var> be <emu-val>false</emu-val>.</li><li>If <var>allocatingGrowableBuffer</var> is <emu-val>true</emu-val>, then<ol><li>If <var>byteLength</var> &gt; <var>maxByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Append <var class="field">[[ArrayBufferByteLengthData]]</var> and <var class="field">[[ArrayBufferMaxByteLength]]</var> to <var>slots</var>.</li></ol></li><li>Else,<ol><li>Append <var class="field">[[ArrayBufferByteLength]]</var> to <var>slots</var>.</li></ol></li><li>Let <var>obj</var> be ?&nbsp;<emu-xref aoid="OrdinaryCreateFromConstructor" id="_ref_14774"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycreatefromconstructor" class="e-user-code">OrdinaryCreateFromConstructor</a></emu-xref>(<var>constructor</var>, <emu-val>"%SharedArrayBuffer.prototype%"</emu-val>, <var>slots</var>).</li><li>If <var>allocatingGrowableBuffer</var> is <emu-val>true</emu-val>, let <var>allocLength</var> be <var>maxByteLength</var>; else let <var>allocLength</var> be <var>byteLength</var>.</li><li>Let <var>block</var> be ?&nbsp;<emu-xref aoid="CreateSharedByteDataBlock" id="_ref_14775"><a href="ecmascript-data-types-and-values.html#sec-createsharedbytedatablock">CreateSharedByteDataBlock</a></emu-xref>(<var>allocLength</var>).</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferData]]</var> to <var>block</var>.</li><li>If <var>allocatingGrowableBuffer</var> is <emu-val>true</emu-val>, then<ol><li><emu-xref href="#assert" id="_ref_14776"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>byteLength</var> ≤ <var>maxByteLength</var>.</li><li>Let <var>byteLengthBlock</var> be ?&nbsp;<emu-xref aoid="CreateSharedByteDataBlock" id="_ref_14777"><a href="ecmascript-data-types-and-values.html#sec-createsharedbytedatablock">CreateSharedByteDataBlock</a></emu-xref>(8).</li><li>Perform <emu-xref aoid="SetValueInBuffer" id="_ref_14778"><a href="structured-data.html#sec-setvalueinbuffer">SetValueInBuffer</a></emu-xref>(<var>byteLengthBlock</var>, 0, <emu-const>biguint64</emu-const>, <emu-xref aoid="ℤ" id="_ref_14779"><a href="notational-conventions.html#%E2%84%A4">ℤ</a></emu-xref>(<var>byteLength</var>), <emu-val>true</emu-val>, <emu-const>seq-cst</emu-const>).</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferByteLengthData]]</var> to <var>byteLengthBlock</var>.</li><li>Set <var>obj</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var> to <var>maxByteLength</var>.</li></ol></li><li>Else,<ol><li>Set <var>obj</var>.<var class="field">[[ArrayBufferByteLength]]</var> to <var>byteLength</var>.</li></ol></li><li>Return <var>obj</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-issharedarraybuffer" type="abstract operation" aoid="IsSharedArrayBuffer">
<h1><span class="secnum">25.2.2.2</span> IsSharedArrayBuffer ( <var>obj</var> )</h1>
<p>The abstract operation IsSharedArrayBuffer takes argument <var>obj</var> (an ArrayBuffer or a SharedArrayBuffer) and returns a Boolean. It tests whether an object is a SharedArrayBuffer. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>obj</var>.<var class="field">[[ArrayBufferData]]</var> is a <emu-xref href="#sec-data-blocks" id="_ref_14780"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isgrowablesharedarraybuffer" type="abstract operation" aoid="IsGrowableSharedArrayBuffer">
<h1><span class="secnum">25.2.2.3</span> IsGrowableSharedArrayBuffer ( <var>obj</var> )</h1>
<p>The abstract operation IsGrowableSharedArrayBuffer takes argument <var>obj</var> (an ArrayBuffer or a SharedArrayBuffer) and returns a Boolean. It tests whether an object is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14781"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14782"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>obj</var>) is <emu-val>true</emu-val> and <var>obj</var> has an <var class="field">[[ArrayBufferByteLengthData]]</var> internal slot, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-hostgrowsharedarraybuffer" type="host-defined abstract operation" aoid="HostGrowSharedArrayBuffer">
<h1><span class="secnum">25.2.2.4</span> HostGrowSharedArrayBuffer ( <var>buffer</var>, <var>newByteLength</var> )</h1>
<p>The <emu-xref href="#host-defined" id="_ref_14783"><a href="overview.html#host-defined">host-defined</a></emu-xref> abstract operation HostGrowSharedArrayBuffer takes arguments <var>buffer</var> (a SharedArrayBuffer) and <var>newByteLength</var> (a non-negative <emu-xref href="#integer" id="_ref_14784"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14785"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either <emu-const>handled</emu-const> or <emu-const>unhandled</emu-const>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14786"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It gives the <emu-xref href="#host" id="_ref_14787"><a href="overview.html#host">host</a></emu-xref> an opportunity to perform <emu-xref href="#implementation-defined" id="_ref_14788"><a href="overview.html#implementation-defined">implementation-defined</a></emu-xref> growing of <var>buffer</var>. If the <emu-xref href="#host" id="_ref_14789"><a href="overview.html#host">host</a></emu-xref> chooses not to handle growing of <var>buffer</var>, it may return <emu-const>unhandled</emu-const> for the default behaviour.</p>
<p>The implementation of HostGrowSharedArrayBuffer must conform to the following requirements:</p>
<ul>
<li>If the abstract operation does not complete normally with <emu-const>unhandled</emu-const>, and <var>newByteLength</var> &lt; the current byte length of the <var>buffer</var> or <var>newByteLength</var> &gt; <var>buffer</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>, throw a <emu-val>RangeError</emu-val> exception.</li>
<li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14790"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14791"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>. Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>. If the abstract operation completes normally with <emu-const>handled</emu-const>, a <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14792"><a href="memory-model.html#sec-memory-model-fundamentals">WriteSharedMemory</a></emu-xref> or <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14793"><a href="memory-model.html#sec-memory-model-fundamentals">ReadModifyWriteSharedMemory</a></emu-xref> event whose <var class="field">[[Order]]</var> is <emu-const>seq-cst</emu-const>, <var class="field">[[Payload]]</var> is <emu-xref aoid="NumericToRawBytes" id="_ref_14794"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<emu-const>biguint64</emu-const>, <var>newByteLength</var>, <var>isLittleEndian</var>), <var class="field">[[Block]]</var> is <var>buffer</var>.<var class="field">[[ArrayBufferByteLengthData]]</var>, <var class="field">[[ByteIndex]]</var> is 0, and <var class="field">[[ElementSize]]</var> is 8 is added to the <emu-xref href="#surrounding-agent" id="_ref_14795"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>'s <emu-xref href="#sec-candidate-executions" id="_ref_14796"><a href="memory-model.html#sec-candidate-executions">candidate execution</a></emu-xref> such that racing calls to <emu-xref href="#sec-sharedarraybuffer.prototype.grow" title="" id="_ref_801"><a href="structured-data.html#sec-sharedarraybuffer.prototype.grow">SharedArrayBuffer.prototype.grow ( <var>newLength</var> )</a></emu-xref> are not "lost", i.e. silently do nothing.</li>
</ul>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>The second requirement above is intentionally vague about how or when the current byte length of <var>buffer</var> is read. Because the byte length must be updated via an atomic read-modify-write operation on the underlying hardware, architectures that use load-link/store-conditional or load-exclusive/store-exclusive instruction pairs may wish to keep the paired instructions close in the instruction stream. As such, <emu-xref href="#sec-sharedarraybuffer.prototype.grow" title="" id="_ref_802"><a href="structured-data.html#sec-sharedarraybuffer.prototype.grow">SharedArrayBuffer.prototype.grow ( <var>newLength</var> )</a></emu-xref> itself does not perform bounds checking on <var>newByteLength</var> before calling HostGrowSharedArrayBuffer, nor is there a requirement on when the current byte length is read.</p>
<p>This is in contrast with <emu-xref aoid="HostResizeArrayBuffer" id="_ref_14797"><a href="structured-data.html#sec-hostresizearraybuffer">HostResizeArrayBuffer</a></emu-xref>, which is guaranteed that 0 ≤ <var>newByteLength</var> ≤ <var>buffer</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>.</p>
</div></emu-note>
<p>The default implementation of HostGrowSharedArrayBuffer is to return <emu-xref aoid="NormalCompletion" id="_ref_14798"><a href="ecmascript-data-types-and-values.html#sec-normalcompletion">NormalCompletion</a></emu-xref>(<emu-const>unhandled</emu-const>).</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-sharedarraybuffer-constructor">
<h1><span class="secnum">25.2.3</span> The SharedArrayBuffer Constructor</h1>
<p>The SharedArrayBuffer <emu-xref href="#constructor" id="_ref_14799"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>is <dfn tabindex="-1">%SharedArrayBuffer%</dfn>.</li>
<li>is the initial value of the <emu-val>"SharedArrayBuffer"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_14800"><a href="global-object.html#sec-global-object">global object</a></emu-xref>, if that property is present (see below).</li>
<li>creates and initializes a new SharedArrayBuffer when called as a <emu-xref href="#constructor" id="_ref_14801"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>.</li>
<li>is not intended to be called as a function and will throw an exception when called in that manner.</li>
<li>may be used as the value of an <code>extends</code> clause of a class definition. Subclass <emu-xref href="#constructor" id="_ref_14802"><a href="ecmascript-data-types-and-values.html#constructor">constructors</a></emu-xref> that intend to inherit the specified SharedArrayBuffer behaviour must include a <code>super</code> call to the SharedArrayBuffer <emu-xref href="#constructor" id="_ref_14803"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> to create and initialize subclass instances with the internal state necessary to support the <code>SharedArrayBuffer.prototype</code> built-in methods.</li>
</ul>
<p>Whenever a <emu-xref href="#host" id="_ref_14804"><a href="overview.html#host">host</a></emu-xref> does not provide concurrent access to SharedArrayBuffers it may omit the <emu-val>"SharedArrayBuffer"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_14805"><a href="global-object.html#sec-global-object">global object</a></emu-xref>.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>Unlike an <code>ArrayBuffer</code>, a <code>SharedArrayBuffer</code> cannot become detached, and its internal <var class="field">[[ArrayBufferData]]</var> slot is never <emu-val>null</emu-val>.</p>
</div></emu-note>
<emu-clause id="sec-sharedarraybuffer-length" type="built-in function">
<h1><span class="secnum">25.2.3.1</span> SharedArrayBuffer ( <var>length</var> [ , <var>options</var> ] )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>byteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14806"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>length</var>).</li><li>Let <var>requestedMaxByteLength</var> be ?&nbsp;<emu-xref aoid="GetArrayBufferMaxByteLengthOption" id="_ref_14807"><a href="structured-data.html#sec-getarraybuffermaxbytelengthoption" class="e-user-code">GetArrayBufferMaxByteLengthOption</a></emu-xref>(<var>options</var>).</li><li>Return ?&nbsp;<emu-xref aoid="AllocateSharedArrayBuffer" id="_ref_14808"><a href="structured-data.html#sec-allocatesharedarraybuffer" class="e-user-code">AllocateSharedArrayBuffer</a></emu-xref>(NewTarget, <var>byteLength</var>, <var>requestedMaxByteLength</var>).</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-sharedarraybuffer-constructor">
<h1><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</h1>
<p>The SharedArrayBuffer <emu-xref href="#constructor" id="_ref_14809"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-function-prototype-object" id="_ref_14810"><a href="fundamental-objects.html#sec-properties-of-the-function-prototype-object">%Function.prototype%</a></emu-xref>.</li>
<li>has the following properties:</li>
</ul>
<emu-clause id="sec-sharedarraybuffer.prototype">
<h1><span class="secnum">25.2.4.1</span> SharedArrayBuffer.prototype</h1>
<p>The initial value of <code>SharedArrayBuffer.prototype</code> is the <emu-xref href="#sec-properties-of-the-sharedarraybuffer-prototype-object" id="_ref_14811"><a href="structured-data.html#sec-properties-of-the-sharedarraybuffer-prototype-object">SharedArrayBuffer prototype object</a></emu-xref>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>false</emu-val> }.</p>
</emu-clause>
<emu-clause oldids="sec-sharedarraybuffer-@@species" id="sec-sharedarraybuffer-%symbol.species%" type="built-in function"><span id="sec-sharedarraybuffer-@@species"></span>
<h1><span class="secnum">25.2.4.2</span> get SharedArrayBuffer [ %Symbol.species% ]</h1>
<p><code>SharedArrayBuffer[%Symbol.species%]</code> is an <emu-xref href="#sec-object-type" id="_ref_14812"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Return the <emu-val>this</emu-val> value.</li></ol></emu-alg>
<p>The value of the <emu-val>"name"</emu-val> property of this function is <emu-val>"get [Symbol.species]"</emu-val>.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-sharedarraybuffer-prototype-object">
<h1><span class="secnum">25.2.5</span> Properties of the SharedArrayBuffer Prototype Object</h1>
<p>The <dfn tabindex="-1">SharedArrayBuffer prototype object</dfn>:</p>
<ul>
<li>is <dfn tabindex="-1">%SharedArrayBuffer.prototype%</dfn>.</li>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_14813"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>.</li>
<li>is an <emu-xref href="#ordinary-object" id="_ref_14814"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary object</a></emu-xref>.</li>
<li>does not have an <var class="field">[[ArrayBufferData]]</var> or <var class="field">[[ArrayBufferByteLength]]</var> internal slot.</li>
</ul>
<emu-clause id="sec-get-sharedarraybuffer.prototype.bytelength" type="built-in function">
<h1><span class="secnum">25.2.5.1</span> get SharedArrayBuffer.prototype.byteLength</h1>
<p><code>SharedArrayBuffer.prototype.byteLength</code> is an <emu-xref href="#sec-object-type" id="_ref_14815"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14816"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14817"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>length</var> be <emu-xref aoid="ArrayBufferByteLength" id="_ref_14818"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>O</var>, <emu-const>seq-cst</emu-const>).</li><li>Return <emu-xref aoid="𝔽" id="_ref_14819"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>length</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-sharedarraybuffer.prototype.constructor">
<h1><span class="secnum">25.2.5.2</span> SharedArrayBuffer.prototype.constructor</h1>
<p>The initial value of <code>SharedArrayBuffer.prototype.constructor</code> is <emu-xref href="#sec-sharedarraybuffer-constructor" id="_ref_14820"><a href="structured-data.html#sec-sharedarraybuffer-constructor">%SharedArrayBuffer%</a></emu-xref>.</p>
</emu-clause>
<emu-clause id="sec-sharedarraybuffer.prototype.grow" type="built-in function">
<h1><span class="secnum">25.2.5.3</span> SharedArrayBuffer.prototype.grow ( <var>newLength</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14821"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferMaxByteLength]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14822"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>newByteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14823"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>newLength</var>).</li><li>Let <var>hostHandled</var> be ?&nbsp;<emu-xref aoid="HostGrowSharedArrayBuffer" id="_ref_14824"><a href="structured-data.html#sec-hostgrowsharedarraybuffer">HostGrowSharedArrayBuffer</a></emu-xref>(<var>O</var>, <var>newByteLength</var>).</li><li>If <var>hostHandled</var> is <emu-const>handled</emu-const>, return <emu-val>undefined</emu-val>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_14825"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_14826"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Let <var>byteLengthBlock</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLengthData]]</var>.</li><li>Let <var>currentByteLengthRawBytes</var> be <emu-xref aoid="GetRawBytesFromSharedBlock" id="_ref_14827"><a href="structured-data.html#sec-getrawbytesfromsharedblock">GetRawBytesFromSharedBlock</a></emu-xref>(<var>byteLengthBlock</var>, 0, <emu-const>biguint64</emu-const>, <emu-val>true</emu-val>, <emu-const>seq-cst</emu-const>).</li><li>Let <var>newByteLengthRawBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_14828"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<emu-const>biguint64</emu-const>, <emu-xref aoid="ℤ" id="_ref_14829"><a href="notational-conventions.html#%E2%84%A4">ℤ</a></emu-xref>(<var>newByteLength</var>), <var>isLittleEndian</var>).</li><li>Repeat,<ol><li>NOTE: This is a compare-and-exchange loop to ensure that parallel, racing grows of the same buffer are totally ordered, are not lost, and do not silently do nothing. The loop exits if it was able to attempt to grow uncontended.</li><li>Let <var>currentByteLength</var> be <emu-xref aoid="ℝ" id="_ref_14830"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(<emu-xref aoid="RawBytesToNumeric" id="_ref_14831"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<emu-const>biguint64</emu-const>, <var>currentByteLengthRawBytes</var>, <var>isLittleEndian</var>)).</li><li>If <var>newByteLength</var> = <var>currentByteLength</var>, return <emu-val>undefined</emu-val>.</li><li>If <var>newByteLength</var> &lt; <var>currentByteLength</var> or <var>newByteLength</var> &gt; <var>O</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>byteLengthDelta</var> be <var>newByteLength</var> - <var>currentByteLength</var>.</li><li>If it is impossible to create a new <emu-xref href="#sec-data-blocks" id="_ref_14832"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref> value consisting of <var>byteLengthDelta</var> bytes, throw a <emu-val>RangeError</emu-val> exception.</li><li>NOTE: No new <emu-xref href="#sec-data-blocks" id="_ref_14833"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref> is constructed and used here. The observable behaviour of growable SharedArrayBuffers is specified by allocating a <emu-xref aoid="max" id="_ref_14834"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>-sized <emu-xref href="#sec-data-blocks" id="_ref_14835"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref> at construction time, and this step captures the requirement that implementations that run out of memory must throw a <emu-val>RangeError</emu-val>.</li><li>Let <var>readByteLengthRawBytes</var> be <emu-xref aoid="AtomicCompareExchangeInSharedBlock" id="_ref_14836"><a href="structured-data.html#sec-atomiccompareexchangeinsharedblock">AtomicCompareExchangeInSharedBlock</a></emu-xref>(<var>byteLengthBlock</var>, 0, 8, <var>currentByteLengthRawBytes</var>, <var>newByteLengthRawBytes</var>).</li><li>If <emu-xref aoid="ByteListEqual" id="_ref_14837"><a href="structured-data.html#sec-bytelistequal">ByteListEqual</a></emu-xref>(<var>readByteLengthRawBytes</var>, <var>currentByteLengthRawBytes</var>) is <emu-val>true</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Set <var>currentByteLengthRawBytes</var> to <var>readByteLengthRawBytes</var>.</li></ol></li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>Spurious failures of the compare-exchange to update the length are prohibited. If the bounds checking for the new length passes and the implementation is not out of memory, a <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14838"><a href="memory-model.html#sec-memory-model-fundamentals">ReadModifyWriteSharedMemory</a></emu-xref> event (i.e. a successful compare-exchange) is always added into the <emu-xref href="#sec-candidate-executions" id="_ref_14839"><a href="memory-model.html#sec-candidate-executions">candidate execution</a></emu-xref>.</p>
<p>Parallel calls to SharedArrayBuffer.prototype.grow are totally ordered. For example, consider two racing calls: <code>sab.grow(10)</code> and <code>sab.grow(20)</code>. One of the two calls is guaranteed to win the race. The call to <code>sab.grow(10)</code> will never shrink <code>sab</code> even if <code>sab.grow(20)</code> happened first; in that case it will instead throw a RangeError.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-get-sharedarraybuffer.prototype.growable" type="built-in function">
<h1><span class="secnum">25.2.5.4</span> get SharedArrayBuffer.prototype.growable</h1>
<p><code>SharedArrayBuffer.prototype.growable</code> is an <emu-xref href="#sec-object-type" id="_ref_14840"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14841"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14842"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14843"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-get-sharedarraybuffer.prototype.maxbytelength" type="built-in function">
<h1><span class="secnum">25.2.5.5</span> get SharedArrayBuffer.prototype.maxByteLength</h1>
<p><code>SharedArrayBuffer.prototype.maxByteLength</code> is an <emu-xref href="#sec-object-type" id="_ref_14844"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14845"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14846"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14847"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>length</var> be <var>O</var>.<var class="field">[[ArrayBufferByteLength]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>length</var> be <var>O</var>.<var class="field">[[ArrayBufferMaxByteLength]]</var>.</li></ol></li><li>Return <emu-xref aoid="𝔽" id="_ref_14848"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>length</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-sharedarraybuffer.prototype.slice" type="built-in function">
<h1><span class="secnum">25.2.5.6</span> SharedArrayBuffer.prototype.slice ( <var>start</var>, <var>end</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14849"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14850"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>O</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>len</var> be <emu-xref aoid="ArrayBufferByteLength" id="_ref_14851"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>O</var>, <emu-const>seq-cst</emu-const>).</li><li>Let <var>relativeStart</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_14852"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>start</var>).</li><li>If <var>relativeStart</var> = -∞, let <var>first</var> be 0.</li><li>Else if <var>relativeStart</var> &lt; 0, let <var>first</var> be <emu-xref aoid="max" id="_ref_14853"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>len</var> + <var>relativeStart</var>, 0).</li><li>Else, let <var>first</var> be <emu-xref aoid="min" id="_ref_14854"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>relativeStart</var>, <var>len</var>).</li><li>If <var>end</var> is <emu-val>undefined</emu-val>, let <var>relativeEnd</var> be <var>len</var>; else let <var>relativeEnd</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_14855"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>end</var>).</li><li>If <var>relativeEnd</var> = -∞, let <var>final</var> be 0.</li><li>Else if <var>relativeEnd</var> &lt; 0, let <var>final</var> be <emu-xref aoid="max" id="_ref_14856"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>len</var> + <var>relativeEnd</var>, 0).</li><li>Else, let <var>final</var> be <emu-xref aoid="min" id="_ref_14857"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>relativeEnd</var>, <var>len</var>).</li><li>Let <var>newLen</var> be <emu-xref aoid="max" id="_ref_14858"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>final</var> - <var>first</var>, 0).</li><li>Let <var>ctor</var> be ?&nbsp;<emu-xref aoid="SpeciesConstructor" id="_ref_14859"><a href="abstract-operations.html#sec-speciesconstructor" class="e-user-code">SpeciesConstructor</a></emu-xref>(<var>O</var>, <emu-xref href="#sec-sharedarraybuffer-constructor" id="_ref_14860"><a href="structured-data.html#sec-sharedarraybuffer-constructor">%SharedArrayBuffer%</a></emu-xref>).</li><li>Let <var>new</var> be ?&nbsp;<emu-xref aoid="Construct" id="_ref_14861"><a href="abstract-operations.html#sec-construct" class="e-user-code">Construct</a></emu-xref>(<var>ctor</var>, « <emu-xref aoid="𝔽" id="_ref_14862"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>newLen</var>)&nbsp;»).</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14863"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>new</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_14864"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>new</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>new</var>.<var class="field">[[ArrayBufferData]]</var> is <var>O</var>.<var class="field">[[ArrayBufferData]]</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="ArrayBufferByteLength" id="_ref_14865"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>new</var>, <emu-const>seq-cst</emu-const>) &lt; <var>newLen</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>fromBuf</var> be <var>O</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>toBuf</var> be <var>new</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Perform <emu-xref aoid="CopyDataBlockBytes" id="_ref_14866"><a href="ecmascript-data-types-and-values.html#sec-copydatablockbytes">CopyDataBlockBytes</a></emu-xref>(<var>toBuf</var>, 0, <var>fromBuf</var>, <var>first</var>, <var>newLen</var>).</li><li>Return <var>new</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause oldids="sec-sharedarraybuffer.prototype.toString,sec-sharedarraybuffer.prototype-@@tostringtag" id="sec-sharedarraybuffer.prototype-%symbol.tostringtag%"><span id="sec-sharedarraybuffer.prototype-@@tostringtag"></span><span id="sec-sharedarraybuffer.prototype.toString"></span>
<h1><span class="secnum">25.2.5.7</span> SharedArrayBuffer.prototype [ %Symbol.toStringTag% ]</h1>
<p>The initial value of the <emu-xref href="#sec-well-known-symbols" id="_ref_14867"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.toStringTag%</a></emu-xref> property is the String value <emu-val>"SharedArrayBuffer"</emu-val>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>true</emu-val> }.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-sharedarraybuffer-instances">
<h1><span class="secnum">25.2.6</span> Properties of SharedArrayBuffer Instances</h1>
<p>SharedArrayBuffer instances inherit properties from the <emu-xref href="#sec-properties-of-the-sharedarraybuffer-prototype-object" id="_ref_14868"><a href="structured-data.html#sec-properties-of-the-sharedarraybuffer-prototype-object">SharedArrayBuffer prototype object</a></emu-xref>. SharedArrayBuffer instances each have an <var class="field">[[ArrayBufferData]]</var> internal slot. SharedArrayBuffer instances which are not growable each have an <var class="field">[[ArrayBufferByteLength]]</var> internal slot. SharedArrayBuffer instances which are growable each have an <var class="field">[[ArrayBufferByteLengthData]]</var> internal slot and an <var class="field">[[ArrayBufferMaxByteLength]]</var> internal slot.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>SharedArrayBuffer instances, unlike ArrayBuffer instances, are never detached.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-growable-sharedarraybuffer-guidelines">
<h1><span class="secnum">25.2.7</span> Growable SharedArrayBuffer Guidelines</h1>
<emu-note><span class="note">Note 1</span><div class="note-contents">
<p>The following are guidelines for ECMAScript programmers working with <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14869"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</p>
<p>We recommend that programs be tested in their deployment environments where possible. The amount of available physical memory differ greatly between hardware devices. Similarly, virtual memory subsystems also differ greatly between hardware devices as well as operating systems. An application that runs without out-of-memory errors on a 64-bit desktop web browser could run out of memory on a 32-bit mobile web browser.</p>
<p>When choosing a value for the <emu-val>"maxByteLength"</emu-val> option for <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14870"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>, we recommend that the smallest possible size for the application be chosen. We recommend that <emu-val>"maxByteLength"</emu-val> does not exceed 1073741824, or 1GiB.</p>
<p>Please note that successfully constructing a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14871"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref> for a particular maximum size does not guarantee that future grows will succeed.</p>
<p>Not all loads of a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14872"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>'s length are synchronizing <emu-const>seq-cst</emu-const> loads. Loads of the length that are for bounds-checking of an <emu-xref href="#integer-index" id="_ref_14873"><a href="ecmascript-data-types-and-values.html#integer-index">integer-indexed</a></emu-xref> property access, e.g. <code>u8[idx]</code>, are not synchronizing. In general, in the absence of explicit synchronization, one property access being in-bound does not imply a subsequent property access in the same <emu-xref href="#agent" id="_ref_14874"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> is also in-bound. In contrast, explicit loads of the length via the <code>length</code> and <code>byteLength</code> getters on SharedArrayBuffer, <emu-xref href="#sec-%typedarray%-intrinsic-object" id="_ref_14875"><a href="indexed-collections.html#sec-%typedarray%-intrinsic-object">%TypedArray%</a></emu-xref>.prototype, and DataView.prototype are synchronizing. Loads of the length that are performed by built-in methods to check if a <emu-xref href="#typedarray" id="_ref_14876"><a href="ordinary-and-exotic-objects-behaviours.html#typedarray">TypedArray</a></emu-xref> is entirely out-of-bounds are also synchronizing.</p>
</div></emu-note>
<emu-note><span class="note">Note 2</span><div class="note-contents">
<p>The following are guidelines for ECMAScript implementers implementing <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14877"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</p>
<p>We recommend <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14878"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref> be implemented as in-place growth via reserving virtual memory up front.</p>
<p>Because grow operations can happen in parallel with memory accesses on a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14879"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>, the constraints of the <emu-xref href="#sec-memory-model" id="_ref_14880"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref> require that even unordered accesses do not "tear" (bits of their values will not be mixed). In practice, this means the underlying data block of a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14881"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref> cannot be grown by being copied without stopping the world. We do not recommend stopping the world as an implementation strategy because it introduces a serialization point and is slow.</p>
<p>Grown memory must appear zeroed from the moment of its creation, including to any racy accesses in parallel. This can be accomplished via zero-filled-on-demand virtual memory pages, or careful synchronization if manually zeroing memory.</p>
<p><emu-xref href="#integer-index" id="_ref_14882"><a href="ecmascript-data-types-and-values.html#integer-index">Integer-indexed</a></emu-xref> property access on <emu-xref href="#typedarray" id="_ref_14883"><a href="ordinary-and-exotic-objects-behaviours.html#typedarray">TypedArray</a></emu-xref> views of growable SharedArrayBuffers is intended to be optimizable similarly to access on <emu-xref href="#typedarray" id="_ref_14884"><a href="ordinary-and-exotic-objects-behaviours.html#typedarray">TypedArray</a></emu-xref> views of non-growable SharedArrayBuffers, because <emu-xref href="#integer-index" id="_ref_14885"><a href="ecmascript-data-types-and-values.html#integer-index">integer-indexed</a></emu-xref> property loads on are not synchronizing on the underlying buffer's length (see programmer guidelines above). For example, bounds checks for property accesses may still be hoisted out of loops.</p>
<p>In practice it is difficult to implement <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14886"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref> by copying on <emu-xref href="#host" id="_ref_14887"><a href="overview.html#host">hosts</a></emu-xref> that do not have virtual memory, such as those running on embedded devices without an MMU. Memory usage behaviour of growable SharedArrayBuffers on such <emu-xref href="#host" id="_ref_14888"><a href="overview.html#host">hosts</a></emu-xref> may significantly differ from that of <emu-xref href="#host" id="_ref_14889"><a href="overview.html#host">hosts</a></emu-xref> with virtual memory. Such <emu-xref href="#host" id="_ref_14890"><a href="overview.html#host">hosts</a></emu-xref> should clearly communicate memory usage expectations to users.</p>
</div></emu-note>
</emu-clause>
</emu-clause>
<emu-clause id="sec-dataview-objects">
<h1><span class="secnum">25.3</span> DataView Objects</h1>
<emu-clause id="sec-abstract-operations-for-dataview-objects">
<h1><span class="secnum">25.3.1</span> Abstract Operations For DataView Objects</h1>
<emu-clause id="sec-dataview-with-buffer-witness-records">
<h1><span class="secnum">25.3.1.1</span> DataView With Buffer Witness Records</h1>
<p>A <dfn variants="DataView With Buffer Witness Records" tabindex="-1">DataView With Buffer Witness Record</dfn> is a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14891"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">Record</a></emu-xref> value used to encapsulate a DataView along with a cached byte length of the viewed buffer. It is used to help ensure there is a single <emu-xref href="#sec-memory-model-fundamentals" id="_ref_14892"><a href="memory-model.html#sec-memory-model-fundamentals">ReadSharedMemory</a></emu-xref> event of the byte length data block when the viewed buffer is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14893"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</p>
<p>DataView With Buffer Witness Records have the fields listed in <emu-xref href="#table-dataview-with-buffer-witness-record-fields" id="_ref_803"><a href="structured-data.html#table-dataview-with-buffer-witness-record-fields">Table 72</a></emu-xref>.</p>
<emu-table id="table-dataview-with-buffer-witness-record-fields" caption="DataView With Buffer Witness Record Fields"><figure><figcaption>Table 72: <emu-xref href="#sec-dataview-with-buffer-witness-records" id="_ref_14894"><a href="structured-data.html#sec-dataview-with-buffer-witness-records">DataView With Buffer Witness Record</a></emu-xref> Fields</figcaption>
<table>
<thead>
<tr>
<th>
Field Name
</th>
<th>
Value
</th>
<th>
Meaning
</th>
</tr>
</thead>
<tbody><tr>
<td>
<var class="field">[[Object]]</var>
</td>
<td>
a DataView
</td>
<td>
The DataView object whose buffer's byte length is loaded.
</td>
</tr>
<tr>
<td>
<var class="field">[[CachedBufferByteLength]]</var>
</td>
<td>
a non-negative <emu-xref href="#integer" id="_ref_14895"><a href="notational-conventions.html#integer">integer</a></emu-xref> or <emu-const>detached</emu-const>
</td>
<td>
The byte length of the object's <var class="field">[[ViewedArrayBuffer]]</var> when the <emu-xref href="#sec-list-and-record-specification-type" id="_ref_14896"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">Record</a></emu-xref> was created.
</td>
</tr>
</tbody></table>
</figure></emu-table>
</emu-clause>
<emu-clause id="sec-makedataviewwithbufferwitnessrecord" type="abstract operation" aoid="MakeDataViewWithBufferWitnessRecord">
<h1><span class="secnum">25.3.1.2</span> MakeDataViewWithBufferWitnessRecord ( <var>obj</var>, <var>order</var> )</h1>
<p>The abstract operation MakeDataViewWithBufferWitnessRecord takes arguments <var>obj</var> (a DataView) and <var>order</var> (<emu-const>seq-cst</emu-const> or <emu-const>unordered</emu-const>) and returns a <emu-xref href="#sec-dataview-with-buffer-witness-records" id="_ref_14897"><a href="structured-data.html#sec-dataview-with-buffer-witness-records">DataView With Buffer Witness Record</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>buffer</var> be <var>obj</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14898"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>byteLength</var> be <emu-const>detached</emu-const>.</li></ol></li><li>Else,<ol><li>Let <var>byteLength</var> be <emu-xref aoid="ArrayBufferByteLength" id="_ref_14899"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>buffer</var>, <var>order</var>).</li></ol></li><li>Return the <emu-xref href="#sec-dataview-with-buffer-witness-records" id="_ref_14900"><a href="structured-data.html#sec-dataview-with-buffer-witness-records">DataView With Buffer Witness Record</a></emu-xref> { <var class="field">[[Object]]</var>: <var>obj</var>, <var class="field">[[CachedBufferByteLength]]</var>: <var>byteLength</var>&nbsp;}.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getviewbytelength" type="abstract operation" aoid="GetViewByteLength">
<h1><span class="secnum">25.3.1.3</span> GetViewByteLength ( <var>viewRecord</var> )</h1>
<p>The abstract operation GetViewByteLength takes argument <var>viewRecord</var> (a <emu-xref href="#sec-dataview-with-buffer-witness-records" id="_ref_14901"><a href="structured-data.html#sec-dataview-with-buffer-witness-records">DataView With Buffer Witness Record</a></emu-xref>) and returns a non-negative <emu-xref href="#integer" id="_ref_14902"><a href="notational-conventions.html#integer">integer</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_14903"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsViewOutOfBounds" id="_ref_14904"><a href="structured-data.html#sec-isviewoutofbounds">IsViewOutOfBounds</a></emu-xref>(<var>viewRecord</var>) is <emu-val>false</emu-val>.</li><li>Let <var>view</var> be <var>viewRecord</var>.<var class="field">[[Object]]</var>.</li><li>If <var>view</var>.<var class="field">[[ByteLength]]</var> is not <emu-const>auto</emu-const>, return <var>view</var>.<var class="field">[[ByteLength]]</var>.</li><li><emu-xref href="#assert" id="_ref_14905"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14906"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>view</var>.<var class="field">[[ViewedArrayBuffer]]</var>) is <emu-val>false</emu-val>.</li><li>Let <var>byteOffset</var> be <var>view</var>.<var class="field">[[ByteOffset]]</var>.</li><li>Let <var>byteLength</var> be <var>viewRecord</var>.<var class="field">[[CachedBufferByteLength]]</var>.</li><li><emu-xref href="#assert" id="_ref_14907"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>byteLength</var> is not <emu-const>detached</emu-const>.</li><li>Return <var>byteLength</var> - <var>byteOffset</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-isviewoutofbounds" type="abstract operation" aoid="IsViewOutOfBounds">
<h1><span class="secnum">25.3.1.4</span> IsViewOutOfBounds ( <var>viewRecord</var> )</h1>
<p>The abstract operation IsViewOutOfBounds takes argument <var>viewRecord</var> (a <emu-xref href="#sec-dataview-with-buffer-witness-records" id="_ref_14908"><a href="structured-data.html#sec-dataview-with-buffer-witness-records">DataView With Buffer Witness Record</a></emu-xref>) and returns a Boolean. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be <var>viewRecord</var>.<var class="field">[[Object]]</var>.</li><li>Let <var>bufferByteLength</var> be <var>viewRecord</var>.<var class="field">[[CachedBufferByteLength]]</var>.</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14909"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>view</var>.<var class="field">[[ViewedArrayBuffer]]</var>) is <emu-val>true</emu-val>, then<ol><li><emu-xref href="#assert" id="_ref_14910"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>bufferByteLength</var> is <emu-const>detached</emu-const>.</li><li>Return <emu-val>true</emu-val>.</li></ol></li><li><emu-xref href="#assert" id="_ref_14911"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>bufferByteLength</var> is a non-negative <emu-xref href="#integer" id="_ref_14912"><a href="notational-conventions.html#integer">integer</a></emu-xref>.</li><li>Let <var>byteOffsetStart</var> be <var>view</var>.<var class="field">[[ByteOffset]]</var>.</li><li>If <var>view</var>.<var class="field">[[ByteLength]]</var> is <emu-const>auto</emu-const>, then<ol><li>Let <var>byteOffsetEnd</var> be <var>bufferByteLength</var>.</li></ol></li><li>Else,<ol><li>Let <var>byteOffsetEnd</var> be <var>byteOffsetStart</var> + <var>view</var>.<var class="field">[[ByteLength]]</var>.</li></ol></li><li>NOTE: A 0-length DataView whose <var class="field">[[ByteOffset]]</var> is <var>bufferByteLength</var> is not considered out-of-bounds.</li><li>If <var>byteOffsetStart</var> &gt; <var>bufferByteLength</var> or <var>byteOffsetEnd</var> &gt; <var>bufferByteLength</var>, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getviewvalue" type="abstract operation" aoid="GetViewValue">
<h1><span class="secnum">25.3.1.5</span> GetViewValue ( <var>view</var>, <var>requestIndex</var>, <var>isLittleEndian</var>, <var>type</var> )</h1>
<p>The abstract operation GetViewValue takes arguments <var>view</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14913"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>requestIndex</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14914"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>isLittleEndian</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14915"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14916"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14917"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either a Number or a BigInt, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14918"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It is used by functions on DataView instances to retrieve values from the view's buffer. It performs the following steps when called:</p>
<emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14919"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>view</var>, <var class="field">[[DataView]]</var>).</li><li><emu-xref href="#assert" id="_ref_14920"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>view</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot.</li><li>Let <var>getIndex</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14921"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>requestIndex</var>).</li><li>Set <var>isLittleEndian</var> to <emu-xref aoid="ToBoolean" id="_ref_14922"><a href="abstract-operations.html#sec-toboolean">ToBoolean</a></emu-xref>(<var>isLittleEndian</var>).</li><li>Let <var>viewOffset</var> be <var>view</var>.<var class="field">[[ByteOffset]]</var>.</li><li>Let <var>viewRecord</var> be <emu-xref aoid="MakeDataViewWithBufferWitnessRecord" id="_ref_14923"><a href="structured-data.html#sec-makedataviewwithbufferwitnessrecord">MakeDataViewWithBufferWitnessRecord</a></emu-xref>(<var>view</var>, <emu-const>unordered</emu-const>).</li><li>NOTE: Bounds checking is not a synchronizing operation when <var>view</var>'s backing buffer is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14924"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</li><li>If <emu-xref aoid="IsViewOutOfBounds" id="_ref_14925"><a href="structured-data.html#sec-isviewoutofbounds">IsViewOutOfBounds</a></emu-xref>(<var>viewRecord</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>viewSize</var> be <emu-xref aoid="GetViewByteLength" id="_ref_14926"><a href="structured-data.html#sec-getviewbytelength">GetViewByteLength</a></emu-xref>(<var>viewRecord</var>).</li><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_804"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>If <var>getIndex</var> + <var>elementSize</var> &gt; <var>viewSize</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>bufferIndex</var> be <var>getIndex</var> + <var>viewOffset</var>.</li><li>Return <emu-xref aoid="GetValueFromBuffer" id="_ref_14927"><a href="structured-data.html#sec-getvaluefrombuffer">GetValueFromBuffer</a></emu-xref>(<var>view</var>.<var class="field">[[ViewedArrayBuffer]]</var>, <var>bufferIndex</var>, <var>type</var>, <emu-val>false</emu-val>, <emu-const>unordered</emu-const>, <var>isLittleEndian</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-setviewvalue" type="abstract operation" aoid="SetViewValue">
<h1><span class="secnum">25.3.1.6</span> SetViewValue ( <var>view</var>, <var>requestIndex</var>, <var>isLittleEndian</var>, <var>type</var>, <var>value</var> )</h1>
<p>The abstract operation SetViewValue takes arguments <var>view</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14928"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>requestIndex</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14929"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>isLittleEndian</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14930"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>type</var> (a <emu-xref href="#sec-typedarray-objects" id="_ref_14931"><a href="indexed-collections.html#sec-typedarray-objects">TypedArray element type</a></emu-xref>), and <var>value</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_14932"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14933"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> <emu-val>undefined</emu-val> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_14934"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It is used by functions on DataView instances to store values into the view's buffer. It performs the following steps when called:</p>
<emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14935"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>view</var>, <var class="field">[[DataView]]</var>).</li><li><emu-xref href="#assert" id="_ref_14936"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>view</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot.</li><li>Let <var>getIndex</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14937"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>requestIndex</var>).</li><li>If <emu-xref aoid="IsBigIntElementType" id="_ref_14938"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>true</emu-val>, let <var>numberValue</var> be ?&nbsp;<emu-xref aoid="ToBigInt" id="_ref_14939"><a href="abstract-operations.html#sec-tobigint" class="e-user-code">ToBigInt</a></emu-xref>(<var>value</var>).</li><li>Else, let <var>numberValue</var> be ?&nbsp;<emu-xref aoid="ToNumber" id="_ref_14940"><a href="abstract-operations.html#sec-tonumber" class="e-user-code">ToNumber</a></emu-xref>(<var>value</var>).</li><li>Set <var>isLittleEndian</var> to <emu-xref aoid="ToBoolean" id="_ref_14941"><a href="abstract-operations.html#sec-toboolean">ToBoolean</a></emu-xref>(<var>isLittleEndian</var>).</li><li>Let <var>viewOffset</var> be <var>view</var>.<var class="field">[[ByteOffset]]</var>.</li><li>Let <var>viewRecord</var> be <emu-xref aoid="MakeDataViewWithBufferWitnessRecord" id="_ref_14942"><a href="structured-data.html#sec-makedataviewwithbufferwitnessrecord">MakeDataViewWithBufferWitnessRecord</a></emu-xref>(<var>view</var>, <emu-const>unordered</emu-const>).</li><li>NOTE: Bounds checking is not a synchronizing operation when <var>view</var>'s backing buffer is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_14943"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</li><li>If <emu-xref aoid="IsViewOutOfBounds" id="_ref_14944"><a href="structured-data.html#sec-isviewoutofbounds">IsViewOutOfBounds</a></emu-xref>(<var>viewRecord</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>viewSize</var> be <emu-xref aoid="GetViewByteLength" id="_ref_14945"><a href="structured-data.html#sec-getviewbytelength">GetViewByteLength</a></emu-xref>(<var>viewRecord</var>).</li><li>Let <var>elementSize</var> be the Element Size value specified in <emu-xref href="#table-the-typedarray-constructors" id="_ref_805"><a href="indexed-collections.html#table-the-typedarray-constructors">Table 70</a></emu-xref> for Element Type <var>type</var>.</li><li>If <var>getIndex</var> + <var>elementSize</var> &gt; <var>viewSize</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>bufferIndex</var> be <var>getIndex</var> + <var>viewOffset</var>.</li><li>Perform <emu-xref aoid="SetValueInBuffer" id="_ref_14946"><a href="structured-data.html#sec-setvalueinbuffer">SetValueInBuffer</a></emu-xref>(<var>view</var>.<var class="field">[[ViewedArrayBuffer]]</var>, <var>bufferIndex</var>, <var>type</var>, <var>numberValue</var>, <emu-val>false</emu-val>, <emu-const>unordered</emu-const>, <var>isLittleEndian</var>).</li><li>Return <emu-val>undefined</emu-val>.</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-dataview-constructor">
<h1><span class="secnum">25.3.2</span> The DataView Constructor</h1>
<p>The DataView <emu-xref href="#constructor" id="_ref_14947"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>is <dfn tabindex="-1">%DataView%</dfn>.</li>
<li>is the initial value of the <emu-val>"DataView"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_14948"><a href="global-object.html#sec-global-object">global object</a></emu-xref>.</li>
<li>creates and initializes a new DataView when called as a <emu-xref href="#constructor" id="_ref_14949"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>.</li>
<li>is not intended to be called as a function and will throw an exception when called in that manner.</li>
<li>may be used as the value of an <code>extends</code> clause of a class definition. Subclass <emu-xref href="#constructor" id="_ref_14950"><a href="ecmascript-data-types-and-values.html#constructor">constructors</a></emu-xref> that intend to inherit the specified DataView behaviour must include a <code>super</code> call to the DataView <emu-xref href="#constructor" id="_ref_14951"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> to create and initialize subclass instances with the internal state necessary to support the <code>DataView.prototype</code> built-in methods.</li>
</ul>
<emu-clause id="sec-dataview-buffer-byteoffset-bytelength" type="built-in function">
<h1><span class="secnum">25.3.2.1</span> DataView ( <var>buffer</var> [ , <var>byteOffset</var> [ , <var>byteLength</var> ] ] )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14952"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>buffer</var>, <var class="field">[[ArrayBufferData]]</var>).</li><li>Let <var>offset</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14953"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>byteOffset</var>).</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14954"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>bufferByteLength</var> be <emu-xref aoid="ArrayBufferByteLength" id="_ref_14955"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>buffer</var>, <emu-const>seq-cst</emu-const>).</li><li>If <var>offset</var> &gt; <var>bufferByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>bufferIsFixedLength</var> be <emu-xref aoid="IsFixedLengthArrayBuffer" id="_ref_14956"><a href="structured-data.html#sec-isfixedlengtharraybuffer">IsFixedLengthArrayBuffer</a></emu-xref>(<var>buffer</var>).</li><li>If <var>byteLength</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>bufferIsFixedLength</var> is <emu-val>true</emu-val>, then<ol><li>Let <var>viewByteLength</var> be <var>bufferByteLength</var> - <var>offset</var>.</li></ol></li><li>Else,<ol><li>Let <var>viewByteLength</var> be <emu-const>auto</emu-const>.</li></ol></li></ol></li><li>Else,<ol><li>Let <var>viewByteLength</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_14957"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>byteLength</var>).</li><li>If <var>offset</var> + <var>viewByteLength</var> &gt; <var>bufferByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Let <var>O</var> be ?&nbsp;<emu-xref aoid="OrdinaryCreateFromConstructor" id="_ref_14958"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinarycreatefromconstructor" class="e-user-code">OrdinaryCreateFromConstructor</a></emu-xref>(NewTarget, <emu-val>"%DataView.prototype%"</emu-val>, « <var class="field">[[DataView]]</var>, <var class="field">[[ViewedArrayBuffer]]</var>, <var class="field">[[ByteLength]]</var>, <var class="field">[[ByteOffset]]</var>&nbsp;»).</li><li>If <emu-xref aoid="IsDetachedBuffer" id="_ref_14959"><a href="structured-data.html#sec-isdetachedbuffer">IsDetachedBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Set <var>bufferByteLength</var> to <emu-xref aoid="ArrayBufferByteLength" id="_ref_14960"><a href="structured-data.html#sec-arraybufferbytelength">ArrayBufferByteLength</a></emu-xref>(<var>buffer</var>, <emu-const>seq-cst</emu-const>).</li><li>If <var>offset</var> &gt; <var>bufferByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>If <var>byteLength</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>offset</var> + <var>viewByteLength</var> &gt; <var>bufferByteLength</var>, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>O</var>.<var class="field">[[ViewedArrayBuffer]]</var> to <var>buffer</var>.</li><li>Set <var>O</var>.<var class="field">[[ByteLength]]</var> to <var>viewByteLength</var>.</li><li>Set <var>O</var>.<var class="field">[[ByteOffset]]</var> to <var>offset</var>.</li><li>Return <var>O</var>.</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-dataview-constructor">
<h1><span class="secnum">25.3.3</span> Properties of the DataView Constructor</h1>
<p>The DataView <emu-xref href="#constructor" id="_ref_14961"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>:</p>
<ul>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-function-prototype-object" id="_ref_14962"><a href="fundamental-objects.html#sec-properties-of-the-function-prototype-object">%Function.prototype%</a></emu-xref>.</li>
<li>has the following properties:</li>
</ul>
<emu-clause id="sec-dataview.prototype">
<h1><span class="secnum">25.3.3.1</span> DataView.prototype</h1>
<p>The initial value of <code>DataView.prototype</code> is the <emu-xref href="#sec-properties-of-the-dataview-prototype-object" id="_ref_14963"><a href="structured-data.html#sec-properties-of-the-dataview-prototype-object">DataView prototype object</a></emu-xref>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>false</emu-val> }.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-the-dataview-prototype-object">
<h1><span class="secnum">25.3.4</span> Properties of the DataView Prototype Object</h1>
<p>The <dfn tabindex="-1">DataView prototype object</dfn>:</p>
<ul>
<li>is <dfn tabindex="-1">%DataView.prototype%</dfn>.</li>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_14964"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>.</li>
<li>is an <emu-xref href="#ordinary-object" id="_ref_14965"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary object</a></emu-xref>.</li>
<li>does not have a <var class="field">[[DataView]]</var>, <var class="field">[[ViewedArrayBuffer]]</var>, <var class="field">[[ByteLength]]</var>, or <var class="field">[[ByteOffset]]</var> internal slot.</li>
</ul>
<emu-clause id="sec-get-dataview.prototype.buffer" type="built-in function">
<h1><span class="secnum">25.3.4.1</span> get DataView.prototype.buffer</h1>
<p><code>DataView.prototype.buffer</code> is an <emu-xref href="#sec-object-type" id="_ref_14966"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14967"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[DataView]]</var>).</li><li><emu-xref href="#assert" id="_ref_14968"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>O</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot.</li><li>Let <var>buffer</var> be <var>O</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Return <var>buffer</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-get-dataview.prototype.bytelength" type="built-in function">
<h1><span class="secnum">25.3.4.2</span> get DataView.prototype.byteLength</h1>
<p><code>DataView.prototype.byteLength</code> is an <emu-xref href="#sec-object-type" id="_ref_14969"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14970"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[DataView]]</var>).</li><li><emu-xref href="#assert" id="_ref_14971"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>O</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot.</li><li>Let <var>viewRecord</var> be <emu-xref aoid="MakeDataViewWithBufferWitnessRecord" id="_ref_14972"><a href="structured-data.html#sec-makedataviewwithbufferwitnessrecord">MakeDataViewWithBufferWitnessRecord</a></emu-xref>(<var>O</var>, <emu-const>seq-cst</emu-const>).</li><li>If <emu-xref aoid="IsViewOutOfBounds" id="_ref_14973"><a href="structured-data.html#sec-isviewoutofbounds">IsViewOutOfBounds</a></emu-xref>(<var>viewRecord</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>size</var> be <emu-xref aoid="GetViewByteLength" id="_ref_14974"><a href="structured-data.html#sec-getviewbytelength">GetViewByteLength</a></emu-xref>(<var>viewRecord</var>).</li><li>Return <emu-xref aoid="𝔽" id="_ref_14975"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>size</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-get-dataview.prototype.byteoffset" type="built-in function">
<h1><span class="secnum">25.3.4.3</span> get DataView.prototype.byteOffset</h1>
<p><code>DataView.prototype.byteOffset</code> is an <emu-xref href="#sec-object-type" id="_ref_14976"><a href="ecmascript-data-types-and-values.html#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>O</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14977"><a href="ordinary-and-exotic-objects-behaviours.html#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>O</var>, <var class="field">[[DataView]]</var>).</li><li><emu-xref href="#assert" id="_ref_14978"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>O</var> has a <var class="field">[[ViewedArrayBuffer]]</var> internal slot.</li><li>Let <var>viewRecord</var> be <emu-xref aoid="MakeDataViewWithBufferWitnessRecord" id="_ref_14979"><a href="structured-data.html#sec-makedataviewwithbufferwitnessrecord">MakeDataViewWithBufferWitnessRecord</a></emu-xref>(<var>O</var>, <emu-const>seq-cst</emu-const>).</li><li>If <emu-xref aoid="IsViewOutOfBounds" id="_ref_14980"><a href="structured-data.html#sec-isviewoutofbounds">IsViewOutOfBounds</a></emu-xref>(<var>viewRecord</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>offset</var> be <var>O</var>.<var class="field">[[ByteOffset]]</var>.</li><li>Return <emu-xref aoid="𝔽" id="_ref_14981"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>offset</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.constructor">
<h1><span class="secnum">25.3.4.4</span> DataView.prototype.constructor</h1>
<p>The initial value of <code>DataView.prototype.constructor</code> is <emu-xref href="#sec-dataview-constructor" id="_ref_14982"><a href="structured-data.html#sec-dataview-constructor">%DataView%</a></emu-xref>.</p>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getbigint64" type="built-in function">
<h1><span class="secnum">25.3.4.5</span> DataView.prototype.getBigInt64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14983"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>bigint64</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getbiguint64" type="built-in function">
<h1><span class="secnum">25.3.4.6</span> DataView.prototype.getBigUint64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14984"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>biguint64</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getfloat16" type="built-in function">
<h1><span class="secnum">25.3.4.7</span> DataView.prototype.getFloat16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14985"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float16</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getfloat32" type="built-in function">
<h1><span class="secnum">25.3.4.8</span> DataView.prototype.getFloat32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14986"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float32</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getfloat64" type="built-in function">
<h1><span class="secnum">25.3.4.9</span> DataView.prototype.getFloat64 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14987"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float64</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getint8" type="built-in function">
<h1><span class="secnum">25.3.4.10</span> DataView.prototype.getInt8 ( <var>byteOffset</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14988"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <emu-val>true</emu-val>, <emu-const>int8</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getint16" type="built-in function">
<h1><span class="secnum">25.3.4.11</span> DataView.prototype.getInt16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14989"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>int16</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getint32" type="built-in function">
<h1><span class="secnum">25.3.4.12</span> DataView.prototype.getInt32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14990"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>int32</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getuint8" type="built-in function">
<h1><span class="secnum">25.3.4.13</span> DataView.prototype.getUint8 ( <var>byteOffset</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14991"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <emu-val>true</emu-val>, <emu-const>uint8</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getuint16" type="built-in function">
<h1><span class="secnum">25.3.4.14</span> DataView.prototype.getUint16 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14992"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>uint16</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.getuint32" type="built-in function">
<h1><span class="secnum">25.3.4.15</span> DataView.prototype.getUint32 ( <var>byteOffset</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="GetViewValue" id="_ref_14993"><a href="structured-data.html#sec-getviewvalue" class="e-user-code">GetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>uint32</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setbigint64" type="built-in function">
<h1><span class="secnum">25.3.4.16</span> DataView.prototype.setBigInt64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14994"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>bigint64</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setbiguint64" type="built-in function">
<h1><span class="secnum">25.3.4.17</span> DataView.prototype.setBigUint64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14995"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>biguint64</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setfloat16" type="built-in function">
<h1><span class="secnum">25.3.4.18</span> DataView.prototype.setFloat16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14996"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float16</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setfloat32" type="built-in function">
<h1><span class="secnum">25.3.4.19</span> DataView.prototype.setFloat32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14997"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float32</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setfloat64" type="built-in function">
<h1><span class="secnum">25.3.4.20</span> DataView.prototype.setFloat64 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14998"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>float64</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setint8" type="built-in function">
<h1><span class="secnum">25.3.4.21</span> DataView.prototype.setInt8 ( <var>byteOffset</var>, <var>value</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_14999"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <emu-val>true</emu-val>, <emu-const>int8</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setint16" type="built-in function">
<h1><span class="secnum">25.3.4.22</span> DataView.prototype.setInt16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_15000"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>int16</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setint32" type="built-in function">
<h1><span class="secnum">25.3.4.23</span> DataView.prototype.setInt32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_15001"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>int32</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setuint8" type="built-in function">
<h1><span class="secnum">25.3.4.24</span> DataView.prototype.setUint8 ( <var>byteOffset</var>, <var>value</var> )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_15002"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <emu-val>true</emu-val>, <emu-const>uint8</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setuint16" type="built-in function">
<h1><span class="secnum">25.3.4.25</span> DataView.prototype.setUint16 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_15003"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>uint16</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dataview.prototype.setuint32" type="built-in function">
<h1><span class="secnum">25.3.4.26</span> DataView.prototype.setUint32 ( <var>byteOffset</var>, <var>value</var> [ , <var>littleEndian</var> ] )</h1>
<p>This method performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>view</var> be the <emu-val>this</emu-val> value.</li><li>If <var>littleEndian</var> is not present, set <var>littleEndian</var> to <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="SetViewValue" id="_ref_15004"><a href="structured-data.html#sec-setviewvalue" class="e-user-code">SetViewValue</a></emu-xref>(<var>view</var>, <var>byteOffset</var>, <var>littleEndian</var>, <emu-const>uint32</emu-const>, <var>value</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause oldids="sec-dataview.prototype-@@tostringtag" id="sec-dataview.prototype-%symbol.tostringtag%"><span id="sec-dataview.prototype-@@tostringtag"></span>
<h1><span class="secnum">25.3.4.27</span> DataView.prototype [ %Symbol.toStringTag% ]</h1>
<p>The initial value of the <emu-xref href="#sec-well-known-symbols" id="_ref_15005"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.toStringTag%</a></emu-xref> property is the String value <emu-val>"DataView"</emu-val>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>true</emu-val> }.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-properties-of-dataview-instances">
<h1><span class="secnum">25.3.5</span> Properties of DataView Instances</h1>
<p>DataView instances are <emu-xref href="#ordinary-object" id="_ref_15006"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from the <emu-xref href="#sec-properties-of-the-dataview-prototype-object" id="_ref_15007"><a href="structured-data.html#sec-properties-of-the-dataview-prototype-object">DataView prototype object</a></emu-xref>. DataView instances each have <var class="field">[[DataView]]</var>, <var class="field">[[ViewedArrayBuffer]]</var>, <var class="field">[[ByteLength]]</var>, and <var class="field">[[ByteOffset]]</var> internal slots.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>The value of the <var class="field">[[DataView]]</var> internal slot is not used within this specification. The simple presence of that internal slot is used within the specification to identify objects created using the DataView <emu-xref href="#constructor" id="_ref_15008"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref>.</p>
</div></emu-note>
</emu-clause>
</emu-clause>
<emu-clause id="sec-atomics-object">
<h1><span class="secnum">25.4</span> The Atomics Object</h1>
<p>The Atomics object:</p>
<ul>
<li>is <dfn tabindex="-1">%Atomics%</dfn>.</li>
<li>is the initial value of the <emu-val>"Atomics"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_15009"><a href="global-object.html#sec-global-object">global object</a></emu-xref>.</li>
<li>is an <emu-xref href="#ordinary-object" id="_ref_15010"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary object</a></emu-xref>.</li>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_15011"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>.</li>
<li>does not have a <var class="field">[[Construct]]</var> internal method; it cannot be used as a <emu-xref href="#constructor" id="_ref_15012"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> with the <code>new</code> operator.</li>
<li>does not have a <var class="field">[[Call]]</var> internal method; it cannot be invoked as a function.</li>
</ul>
<p>The Atomics object provides functions that operate indivisibly (atomically) on shared memory array cells as well as functions that let <emu-xref href="#agent" id="_ref_15013"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref> wait for and dispatch primitive events. When used with discipline, the Atomics functions allow multi-<emu-xref href="#agent" id="_ref_15014"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> programs that communicate through shared memory to execute in a well-understood order even on parallel CPUs. The rules that govern shared-memory communication are provided by the <emu-xref href="#sec-memory-model" id="_ref_15015"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref>, defined below.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>For informative guidelines for programming and implementing shared memory in ECMAScript, please see the notes at the end of the <emu-xref href="#sec-memory-model" id="_ref_15016"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref> section.</p>
</div></emu-note>
<emu-clause id="sec-waiter-record">
<h1><span class="secnum">25.4.1</span> Waiter Record</h1>
<p>A <dfn variants="Waiter Records" tabindex="-1">Waiter Record</dfn> is a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15017"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">Record</a></emu-xref> value used to denote a particular call to <code>Atomics.wait</code> or <code>Atomics.waitAsync</code>.</p>
<p>A Waiter Record has fields listed in <emu-xref href="#table-waiterrecord" id="_ref_806"><a href="structured-data.html#table-waiterrecord">Table 73</a></emu-xref>.</p>
<emu-table id="table-waiterrecord" caption="Waiter Record Fields"><figure><figcaption>Table 73: <emu-xref href="#sec-waiter-record" id="_ref_15018"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref> Fields</figcaption>
<table>
<thead>
<tr>
<th>
Field Name
</th>
<th>
Value
</th>
<th>
Meaning
</th>
</tr>
</thead>
<tbody><tr>
<td>
<var class="field">[[AgentSignifier]]</var>
</td>
<td>
an <emu-xref href="#sec-agents" id="_ref_15019"><a href="executable-code-and-execution-contexts.html#sec-agents">agent signifier</a></emu-xref>
</td>
<td>
The <emu-xref href="#agent" id="_ref_15020"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> that called <code>Atomics.wait</code> or <code>Atomics.waitAsync</code>.
</td>
</tr>
<tr>
<td>
<var class="field">[[PromiseCapability]]</var>
</td>
<td>
a <emu-xref href="#sec-promisecapability-records" id="_ref_15021"><a href="control-abstraction-objects.html#sec-promisecapability-records">PromiseCapability Record</a></emu-xref> or <emu-const>blocking</emu-const>
</td>
<td>
If denoting a call to <code>Atomics.waitAsync</code>, the resulting promise, otherwise <emu-const>blocking</emu-const>.
</td>
</tr>
<tr>
<td>
<var class="field">[[TimeoutTime]]</var>
</td>
<td>
a non-negative <emu-xref href="#extended-mathematical-value" id="_ref_15022"><a href="notational-conventions.html#extended-mathematical-value">extended mathematical value</a></emu-xref>
</td>
<td>
The earliest time by which timeout may be triggered; computed using <emu-xref href="#sec-time-values-and-time-range" id="_ref_15023"><a href="numbers-and-dates.html#sec-time-values-and-time-range">time values</a></emu-xref>.
</td>
</tr>
<tr>
<td>
<var class="field">[[Result]]</var>
</td>
<td>
<emu-val>"ok"</emu-val> or <emu-val>"timed-out"</emu-val>
</td>
<td>
The return value of the call.
</td>
</tr>
</tbody></table>
</figure></emu-table>
</emu-clause>
<emu-clause id="sec-waiterlist-records" oldids="sec-waiterlist-objects"><span id="sec-waiterlist-objects"></span>
<h1><span class="secnum">25.4.2</span> WaiterList Records</h1>
<p>A <dfn variants="WaiterList Records" tabindex="-1">WaiterList Record</dfn> is used to explain waiting and notification of <emu-xref href="#agent" id="_ref_15024"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref> via <code>Atomics.wait</code>, <code>Atomics.waitAsync</code>, and <code>Atomics.notify</code>.</p>
<p>A WaiterList Record has fields listed in <emu-xref href="#table-waiterlistrecord" id="_ref_807"><a href="structured-data.html#table-waiterlistrecord">Table 74</a></emu-xref>.</p>
<emu-table id="table-waiterlistrecord" caption="WaiterList Record Fields"><figure><figcaption>Table 74: <emu-xref href="#sec-waiterlist-records" id="_ref_15025"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref> Fields</figcaption>
<table>
<thead>
<tr>
<th>
Field Name
</th>
<th>
Value
</th>
<th>
Meaning
</th>
</tr>
</thead>
<tbody><tr>
<td>
<var class="field">[[Waiters]]</var>
</td>
<td>
a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15026"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-waiter-record" id="_ref_15027"><a href="structured-data.html#sec-waiter-record">Waiter Records</a></emu-xref>
</td>
<td>
The calls to <code>Atomics.wait</code> or <code>Atomics.waitAsync</code> that are waiting on the location with which this WaiterList is associated.
</td>
</tr>
<tr>
<td>
<var class="field">[[MostRecentLeaveEvent]]</var>
</td>
<td>
a <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15028"><a href="memory-model.html#sec-memory-model-fundamentals">Synchronize event</a></emu-xref> or <emu-const>empty</emu-const>
</td>
<td>
The event of the most recent leaving of its <emu-xref href="#sec-waiterlist-records" id="_ref_15029"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref>, or <emu-const>empty</emu-const> if its <emu-xref href="#sec-waiterlist-records" id="_ref_15030"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> has never been entered.
</td>
</tr>
</tbody></table>
</figure></emu-table>
<p>There can be multiple <emu-xref href="#sec-waiter-record" id="_ref_15031"><a href="structured-data.html#sec-waiter-record">Waiter Records</a></emu-xref> in a WaiterList with the same <emu-xref href="#sec-agents" id="_ref_15032"><a href="executable-code-and-execution-contexts.html#sec-agents">agent signifier</a></emu-xref>.</p>
<p>The <emu-xref href="#sec-agent-clusters" id="_ref_15033"><a href="executable-code-and-execution-contexts.html#sec-agent-clusters">agent cluster</a></emu-xref> has a store of WaiterList Records; the store is indexed by (<var>block</var>, <var>i</var>), where <var>block</var> is a <emu-xref href="#sec-data-blocks" id="_ref_15034"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref> and <var>i</var> a byte offset into the memory of <var>block</var>. WaiterList Records are <emu-xref href="#agent" id="_ref_15035"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref>-independent: a lookup in the store of WaiterList Records by (<var>block</var>, <var>i</var>) will result in the same WaiterList Record in any <emu-xref href="#agent" id="_ref_15036"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> in the <emu-xref href="#sec-agent-clusters" id="_ref_15037"><a href="executable-code-and-execution-contexts.html#sec-agent-clusters">agent cluster</a></emu-xref>.</p>
<p>Each WaiterList Record has a <dfn variants="critical sections" tabindex="-1">critical section</dfn> that controls exclusive access to that WaiterList Record during evaluation. Only a single <emu-xref href="#agent" id="_ref_15038"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> may enter a WaiterList Record's critical section at one time. Entering and leaving a WaiterList Record's critical section is controlled by the <emu-xref href="#sec-algorithm-conventions-abstract-operations" id="_ref_15039"><a href="notational-conventions.html#sec-algorithm-conventions-abstract-operations">abstract operations</a></emu-xref> <emu-xref aoid="EnterCriticalSection" id="_ref_15040"><a href="structured-data.html#sec-entercriticalsection">EnterCriticalSection</a></emu-xref> and <emu-xref aoid="LeaveCriticalSection" id="_ref_15041"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>. Operations on a WaiterList Record—adding and removing waiting <emu-xref href="#agent" id="_ref_15042"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref>, traversing the list of <emu-xref href="#agent" id="_ref_15043"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref>, suspending and notifying <emu-xref href="#agent" id="_ref_15044"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref> on the list, setting and retrieving the <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15045"><a href="memory-model.html#sec-memory-model-fundamentals">Synchronize event</a></emu-xref>—may only be performed by <emu-xref href="#agent" id="_ref_15046"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref> that have entered the WaiterList Record's critical section.</p>
</emu-clause>
<emu-clause id="sec-abstract-operations-for-atomics">
<h1><span class="secnum">25.4.3</span> Abstract Operations for Atomics</h1>
<emu-clause id="sec-validateintegertypedarray" type="abstract operation" oldids="sec-validatesharedintegertypedarray" aoid="ValidateIntegerTypedArray"><span id="sec-validatesharedintegertypedarray"></span>
<h1><span class="secnum">25.4.3.1</span> ValidateIntegerTypedArray ( <var>typedArray</var>, <var>waitable</var> )</h1>
<p>The abstract operation ValidateIntegerTypedArray takes arguments <var>typedArray</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15047"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and <var>waitable</var> (a Boolean) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15048"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a <emu-xref href="#sec-typedarray-with-buffer-witness-records" id="_ref_15049"><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-with-buffer-witness-records">TypedArray With Buffer Witness Record</a></emu-xref>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15050"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>taRecord</var> be ?&nbsp;<emu-xref aoid="ValidateTypedArray" id="_ref_15051"><a href="indexed-collections.html#sec-validatetypedarray">ValidateTypedArray</a></emu-xref>(<var>typedArray</var>, <emu-const>unordered</emu-const>).</li><li>NOTE: Bounds checking is not a synchronizing operation when <var>typedArray</var>'s backing buffer is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_15052"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</li><li>If <var>waitable</var> is <emu-val>true</emu-val>, then<ol><li>If <var>typedArray</var>.<var class="field">[[TypedArrayName]]</var> is neither <emu-val>"Int32Array"</emu-val> nor <emu-val>"BigInt64Array"</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>Else,<ol><li>Let <var>type</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15053"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>If <emu-xref aoid="IsUnclampedIntegerElementType" id="_ref_15054"><a href="structured-data.html#sec-isunclampedintegerelementtype">IsUnclampedIntegerElementType</a></emu-xref>(<var>type</var>) is <emu-val>false</emu-val> and <emu-xref aoid="IsBigIntElementType" id="_ref_15055"><a href="structured-data.html#sec-isbigintelementtype">IsBigIntElementType</a></emu-xref>(<var>type</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>Return <var>taRecord</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-validateatomicaccess" type="abstract operation" aoid="ValidateAtomicAccess">
<h1><span class="secnum">25.4.3.2</span> ValidateAtomicAccess ( <var>taRecord</var>, <var>requestIndex</var> )</h1>
<p>The abstract operation ValidateAtomicAccess takes arguments <var>taRecord</var> (a <emu-xref href="#sec-typedarray-with-buffer-witness-records" id="_ref_15056"><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarray-with-buffer-witness-records">TypedArray With Buffer Witness Record</a></emu-xref>) and <var>requestIndex</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15057"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15058"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an <emu-xref href="#integer" id="_ref_15059"><a href="notational-conventions.html#integer">integer</a></emu-xref> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15060"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>length</var> be <emu-xref aoid="TypedArrayLength" id="_ref_15061"><a href="ordinary-and-exotic-objects-behaviours.html#sec-typedarraylength">TypedArrayLength</a></emu-xref>(<var>taRecord</var>).</li><li>Let <var>accessIndex</var> be ?&nbsp;<emu-xref aoid="ToIndex" id="_ref_15062"><a href="abstract-operations.html#sec-toindex" class="e-user-code">ToIndex</a></emu-xref>(<var>requestIndex</var>).</li><li><emu-xref href="#assert" id="_ref_15063"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>accessIndex</var> ≥ 0.</li><li>If <var>accessIndex</var> ≥ <var>length</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>typedArray</var> be <var>taRecord</var>.<var class="field">[[Object]]</var>.</li><li>Let <var>elementSize</var> be <emu-xref aoid="TypedArrayElementSize" id="_ref_15064"><a href="indexed-collections.html#sec-typedarrayelementsize">TypedArrayElementSize</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>offset</var> be <var>typedArray</var>.<var class="field">[[ByteOffset]]</var>.</li><li>Return (<var>accessIndex</var> × <var>elementSize</var>) + <var>offset</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-validateatomicaccessonintegertypedarray" type="abstract operation" aoid="ValidateAtomicAccessOnIntegerTypedArray">
<h1><span class="secnum">25.4.3.3</span> ValidateAtomicAccessOnIntegerTypedArray ( <var>typedArray</var>, <var>requestIndex</var> )</h1>
<p>The abstract operation ValidateAtomicAccessOnIntegerTypedArray takes arguments <var>typedArray</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15065"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and <var>requestIndex</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15066"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15067"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an <emu-xref href="#integer" id="_ref_15068"><a href="notational-conventions.html#integer">integer</a></emu-xref> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15069"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>taRecord</var> be ?&nbsp;<emu-xref aoid="ValidateIntegerTypedArray" id="_ref_15070"><a href="structured-data.html#sec-validateintegertypedarray">ValidateIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <emu-val>false</emu-val>).</li><li>Return ?&nbsp;<emu-xref aoid="ValidateAtomicAccess" id="_ref_15071"><a href="structured-data.html#sec-validateatomicaccess" class="e-user-code">ValidateAtomicAccess</a></emu-xref>(<var>taRecord</var>, <var>requestIndex</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-revalidateatomicaccess" type="abstract operation" aoid="RevalidateAtomicAccess">
<h1><span class="secnum">25.4.3.4</span> RevalidateAtomicAccess ( <var>typedArray</var>, <var>byteIndexInBuffer</var> )</h1>
<p>The abstract operation RevalidateAtomicAccess takes arguments <var>typedArray</var> (a <emu-xref href="#typedarray" id="_ref_15072"><a href="ordinary-and-exotic-objects-behaviours.html#typedarray">TypedArray</a></emu-xref>) and <var>byteIndexInBuffer</var> (an <emu-xref href="#integer" id="_ref_15073"><a href="notational-conventions.html#integer">integer</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15074"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> <emu-const>unused</emu-const> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15075"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. This operation revalidates the index within the backing buffer for atomic operations after all argument coercions are performed in Atomics methods, as argument coercions can have arbitrary side effects, which could cause the buffer to become out of bounds. This operation does not throw when <var>typedArray</var>'s backing buffer is a SharedArrayBuffer. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>taRecord</var> be <emu-xref aoid="MakeTypedArrayWithBufferWitnessRecord" id="_ref_15076"><a href="ordinary-and-exotic-objects-behaviours.html#sec-maketypedarraywithbufferwitnessrecord">MakeTypedArrayWithBufferWitnessRecord</a></emu-xref>(<var>typedArray</var>, <emu-const>unordered</emu-const>).</li><li>NOTE: Bounds checking is not a synchronizing operation when <var>typedArray</var>'s backing buffer is a <emu-xref href="#sec-fixed-length-and-growable-sharedarraybuffer-objects" id="_ref_15077"><a href="structured-data.html#sec-fixed-length-and-growable-sharedarraybuffer-objects">growable SharedArrayBuffer</a></emu-xref>.</li><li>If <emu-xref aoid="IsTypedArrayOutOfBounds" id="_ref_15078"><a href="ordinary-and-exotic-objects-behaviours.html#sec-istypedarrayoutofbounds">IsTypedArrayOutOfBounds</a></emu-xref>(<var>taRecord</var>) is <emu-val>true</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li><emu-xref href="#assert" id="_ref_15079"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>byteIndexInBuffer</var> ≥ <var>typedArray</var>.<var class="field">[[ByteOffset]]</var>.</li><li>If <var>byteIndexInBuffer</var> ≥ <var>taRecord</var>.<var class="field">[[CachedBufferByteLength]]</var>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-getwaiterlist" type="abstract operation" aoid="GetWaiterList">
<h1><span class="secnum">25.4.3.5</span> GetWaiterList ( <var>block</var>, <var>i</var> )</h1>
<p>The abstract operation GetWaiterList takes arguments <var>block</var> (a <emu-xref href="#sec-data-blocks" id="_ref_15080"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref>) and <var>i</var> (a non-negative <emu-xref href="#integer" id="_ref_15081"><a href="notational-conventions.html#integer">integer</a></emu-xref> that is evenly divisible by 4) and returns a <emu-xref href="#sec-waiterlist-records" id="_ref_15082"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15083"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>i</var> and <var>i</var> + 3 are valid byte offsets within the memory of <var>block</var>.</li><li>Return the <emu-xref href="#sec-waiterlist-records" id="_ref_15084"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref> that is referenced by the pair (<var>block</var>, <var>i</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-entercriticalsection" type="abstract operation" aoid="EnterCriticalSection">
<h1><span class="secnum">25.4.3.6</span> EnterCriticalSection ( <var>WL</var> )</h1>
<p>The abstract operation EnterCriticalSection takes argument <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15085"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15086"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15087"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is not in the <emu-xref href="#sec-waiterlist-records" id="_ref_15088"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for any <emu-xref href="#sec-waiterlist-records" id="_ref_15089"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>.</li><li>Wait until no <emu-xref href="#agent" id="_ref_15090"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15091"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>, then enter the <emu-xref href="#sec-waiterlist-records" id="_ref_15092"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var> (without allowing any other <emu-xref href="#agent" id="_ref_15093"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> to enter).</li><li>If <var>WL</var>.<var class="field">[[MostRecentLeaveEvent]]</var> is not <emu-const>empty</emu-const>, then<ol><li>NOTE: A <var>WL</var> whose <emu-xref href="#sec-waiterlist-records" id="_ref_15094"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> has been entered at least once has a <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15095"><a href="memory-model.html#sec-memory-model-fundamentals">Synchronize event</a></emu-xref> set by <emu-xref aoid="LeaveCriticalSection" id="_ref_15096"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15097"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15098"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_15099"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_15100"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>Let <var>enterEvent</var> be a new <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15101"><a href="memory-model.html#sec-memory-model-fundamentals">Synchronize event</a></emu-xref>.</li><li>Append <var>enterEvent</var> to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li><li>Append (<var>WL</var>.<var class="field">[[MostRecentLeaveEvent]]</var>, <var>enterEvent</var>) to <var>eventsRecord</var>.<var class="field">[[AgentSynchronizesWith]]</var>.</li></ol></li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
<p>EnterCriticalSection has <dfn tabindex="-1">contention</dfn> when an <emu-xref href="#agent" id="_ref_15102"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> attempting to enter the <emu-xref href="#sec-waiterlist-records" id="_ref_15103"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> must wait for another <emu-xref href="#agent" id="_ref_15104"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> to leave it. When there is no contention, FIFO order of EnterCriticalSection calls is observable. When there is contention, an implementation may choose an arbitrary order but may not cause an <emu-xref href="#agent" id="_ref_15105"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> to wait indefinitely.</p>
</emu-clause>
<emu-clause id="sec-leavecriticalsection" type="abstract operation" aoid="LeaveCriticalSection">
<h1><span class="secnum">25.4.3.7</span> LeaveCriticalSection ( <var>WL</var> )</h1>
<p>The abstract operation LeaveCriticalSection takes argument <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15106"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15107"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15108"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15109"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15110"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15111"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_15112"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_15113"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>Let <var>leaveEvent</var> be a new <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15114"><a href="memory-model.html#sec-memory-model-fundamentals">Synchronize event</a></emu-xref>.</li><li>Append <var>leaveEvent</var> to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li><li>Set <var>WL</var>.<var class="field">[[MostRecentLeaveEvent]]</var> to <var>leaveEvent</var>.</li><li>Leave the <emu-xref href="#sec-waiterlist-records" id="_ref_15115"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-addwaiter" type="abstract operation" aoid="AddWaiter">
<h1><span class="secnum">25.4.3.8</span> AddWaiter ( <var>WL</var>, <var>waiterRecord</var> )</h1>
<p>The abstract operation AddWaiter takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15116"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>waiterRecord</var> (a <emu-xref href="#sec-waiter-record" id="_ref_15117"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15118"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15119"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15120"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li><emu-xref href="#assert" id="_ref_15121"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: There is no <emu-xref href="#sec-waiter-record" id="_ref_15122"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref> in <var>WL</var>.<var class="field">[[Waiters]]</var> whose <var class="field">[[PromiseCapability]]</var> field is <var>waiterRecord</var>.<var class="field">[[PromiseCapability]]</var> and whose <var class="field">[[AgentSignifier]]</var> field is <var>waiterRecord</var>.<var class="field">[[AgentSignifier]]</var>.</li><li>Append <var>waiterRecord</var> to <var>WL</var>.<var class="field">[[Waiters]]</var>.</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-removewaiter" type="abstract operation" aoid="RemoveWaiter">
<h1><span class="secnum">25.4.3.9</span> RemoveWaiter ( <var>WL</var>, <var>waiterRecord</var> )</h1>
<p>The abstract operation RemoveWaiter takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15123"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>waiterRecord</var> (a <emu-xref href="#sec-waiter-record" id="_ref_15124"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15125"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15126"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15127"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li><emu-xref href="#assert" id="_ref_15128"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>WL</var>.<var class="field">[[Waiters]]</var> contains <var>waiterRecord</var>.</li><li>Remove <var>waiterRecord</var> from <var>WL</var>.<var class="field">[[Waiters]]</var>.</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-removewaiters" type="abstract operation" aoid="RemoveWaiters">
<h1><span class="secnum">25.4.3.10</span> RemoveWaiters ( <var>WL</var>, <var>c</var> )</h1>
<p>The abstract operation RemoveWaiters takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15129"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>c</var> (a non-negative <emu-xref href="#integer" id="_ref_15130"><a href="notational-conventions.html#integer">integer</a></emu-xref> or +∞) and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15131"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-waiter-record" id="_ref_15132"><a href="structured-data.html#sec-waiter-record">Waiter Records</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15133"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15134"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15135"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li>Let <var>len</var> be the number of elements in <var>WL</var>.<var class="field">[[Waiters]]</var>.</li><li>Let <var>n</var> be <emu-xref aoid="min" id="_ref_15136"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(<var>c</var>, <var>len</var>).</li><li>Let <var>L</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15137"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the first <var>n</var> elements of <var>WL</var>.<var class="field">[[Waiters]]</var>.</li><li>Remove the first <var>n</var> elements of <var>WL</var>.<var class="field">[[Waiters]]</var>.</li><li>Return <var>L</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-suspendthisagent" type="abstract operation" oldids="sec-suspend,sec-suspendagent" aoid="SuspendThisAgent"><span id="sec-suspendagent"></span><span id="sec-suspend"></span>
<h1><span class="secnum">25.4.3.11</span> SuspendThisAgent ( <var>WL</var>, <var>waiterRecord</var> )</h1>
<p>The abstract operation SuspendThisAgent takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15138"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>waiterRecord</var> (a <emu-xref href="#sec-waiter-record" id="_ref_15139"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15140"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15141"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15142"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li><emu-xref href="#assert" id="_ref_15143"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>WL</var>.<var class="field">[[Waiters]]</var> contains <var>waiterRecord</var>.</li><li>Let <var>thisAgent</var> be <emu-xref aoid="AgentSignifier" id="_ref_15144"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li><emu-xref href="#assert" id="_ref_15145"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>waiterRecord</var>.<var class="field">[[AgentSignifier]]</var> is <var>thisAgent</var>.</li><li><emu-xref href="#assert" id="_ref_15146"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>waiterRecord</var>.<var class="field">[[PromiseCapability]]</var> is <emu-const>blocking</emu-const>.</li><li><emu-xref href="#assert" id="_ref_15147"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="AgentCanSuspend" id="_ref_15148"><a href="executable-code-and-execution-contexts.html#sec-agentcansuspend">AgentCanSuspend</a></emu-xref>() is <emu-val>true</emu-val>.</li><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15149"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>) and suspend the <emu-xref href="#surrounding-agent" id="_ref_15150"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> until the time is <var>waiterRecord</var>.<var class="field">[[TimeoutTime]]</var>, performing the combined operation in such a way that a notification that arrives after the <emu-xref href="#sec-waiterlist-records" id="_ref_15151"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> is exited but before the suspension takes effect is not lost. The <emu-xref href="#surrounding-agent" id="_ref_15152"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> can only wake from suspension due to a timeout or due to another <emu-xref href="#agent" id="_ref_15153"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> calling <emu-xref aoid="NotifyWaiter" id="_ref_15154"><a href="structured-data.html#sec-notifywaiter">NotifyWaiter</a></emu-xref> with arguments <var>WL</var> and <var>thisAgent</var> (i.e. via a call to <code>Atomics.notify</code>).</li><li>Perform <emu-xref aoid="EnterCriticalSection" id="_ref_15155"><a href="structured-data.html#sec-entercriticalsection">EnterCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-notifywaiter" type="abstract operation" aoid="NotifyWaiter">
<h1><span class="secnum">25.4.3.12</span> NotifyWaiter ( <var>WL</var>, <var>waiterRecord</var> )</h1>
<p>The abstract operation NotifyWaiter takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15156"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>waiterRecord</var> (a <emu-xref href="#sec-waiter-record" id="_ref_15157"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15158"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: The <emu-xref href="#surrounding-agent" id="_ref_15159"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> is in the <emu-xref href="#sec-waiterlist-records" id="_ref_15160"><a href="structured-data.html#sec-waiterlist-records">critical section</a></emu-xref> for <var>WL</var>.</li><li>If <var>waiterRecord</var>.<var class="field">[[PromiseCapability]]</var> is <emu-const>blocking</emu-const>, then<ol><li>Wake the <emu-xref href="#agent" id="_ref_15161"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> whose signifier is <var>waiterRecord</var>.<var class="field">[[AgentSignifier]]</var> from suspension.</li><li>NOTE: This causes the <emu-xref href="#agent" id="_ref_15162"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> to resume execution in <emu-xref aoid="SuspendThisAgent" id="_ref_15163"><a href="structured-data.html#sec-suspendthisagent">SuspendThisAgent</a></emu-xref>.</li></ol></li><li>Else if <emu-xref aoid="AgentSignifier" id="_ref_15164"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>() is <var>waiterRecord</var>.<var class="field">[[AgentSignifier]]</var>, then<ol><li>Let <var>promiseCapability</var> be <var>waiterRecord</var>.<var class="field">[[PromiseCapability]]</var>.</li><li>Perform !&nbsp;<emu-xref aoid="Call" id="_ref_15165"><a href="abstract-operations.html#sec-call">Call</a></emu-xref>(<var>promiseCapability</var>.<var class="field">[[Resolve]]</var>, <emu-val>undefined</emu-val>, « <var>waiterRecord</var>.<var class="field">[[Result]]</var>&nbsp;»).</li></ol></li><li>Else,<ol><li>Perform <emu-xref aoid="EnqueueResolveInAgentJob" id="_ref_15166"><a href="structured-data.html#sec-enqueueresolveinagentjob">EnqueueResolveInAgentJob</a></emu-xref>(<var>waiterRecord</var>.<var class="field">[[AgentSignifier]]</var>, <var>waiterRecord</var>.<var class="field">[[PromiseCapability]]</var>, <var>waiterRecord</var>.<var class="field">[[Result]]</var>).</li></ol></li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>An <emu-xref href="#agent" id="_ref_15167"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> must not access another <emu-xref href="#agent" id="_ref_15168"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref>'s promise capability in any capacity beyond passing it to the <emu-xref href="#host" id="_ref_15169"><a href="overview.html#host">host</a></emu-xref>.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-enqueueresolveinagentjob" type="abstract operation" aoid="EnqueueResolveInAgentJob">
<h1><span class="secnum">25.4.3.13</span> EnqueueResolveInAgentJob ( <var>agentSignifier</var>, <var>promiseCapability</var>, <var>resolution</var> )</h1>
<p>The abstract operation EnqueueResolveInAgentJob takes arguments <var>agentSignifier</var> (an <emu-xref href="#sec-agents" id="_ref_15170"><a href="executable-code-and-execution-contexts.html#sec-agents">agent signifier</a></emu-xref>), <var>promiseCapability</var> (a <emu-xref href="#sec-promisecapability-records" id="_ref_15171"><a href="control-abstraction-objects.html#sec-promisecapability-records">PromiseCapability Record</a></emu-xref>), and <var>resolution</var> (<emu-val>"ok"</emu-val> or <emu-val>"timed-out"</emu-val>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>resolveJob</var> be a new <emu-xref href="#job" id="_ref_15172"><a href="executable-code-and-execution-contexts.html#job">Job</a></emu-xref> <emu-xref href="#sec-abstract-closure" id="_ref_15173"><a href="ecmascript-data-types-and-values.html#sec-abstract-closure">Abstract Closure</a></emu-xref> with no parameters that captures <var>agentSignifier</var>, <var>promiseCapability</var>, and <var>resolution</var> and performs the following steps when called:<ol><li><emu-xref href="#assert" id="_ref_15174"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="AgentSignifier" id="_ref_15175"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>() is <var>agentSignifier</var>.</li><li>Perform !&nbsp;<emu-xref aoid="Call" id="_ref_15176"><a href="abstract-operations.html#sec-call">Call</a></emu-xref>(<var>promiseCapability</var>.<var class="field">[[Resolve]]</var>, <emu-val>undefined</emu-val>, « <var>resolution</var>&nbsp;»).</li><li>Return <emu-const>unused</emu-const>.</li></ol></li><li>Let <var>realmInTargetAgent</var> be !&nbsp;<emu-xref aoid="GetFunctionRealm" id="_ref_15177"><a href="abstract-operations.html#sec-getfunctionrealm">GetFunctionRealm</a></emu-xref>(<var>promiseCapability</var>.<var class="field">[[Resolve]]</var>).</li><li><emu-xref href="#assert" id="_ref_15178"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>agentSignifier</var> is <var>realmInTargetAgent</var>.<var class="field">[[AgentSignifier]]</var>.</li><li>Perform <emu-xref aoid="HostEnqueueGenericJob" id="_ref_15179"><a href="executable-code-and-execution-contexts.html#sec-hostenqueuegenericjob">HostEnqueueGenericJob</a></emu-xref>(<var>resolveJob</var>, <var>realmInTargetAgent</var>).</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-dowait" type="abstract operation" aoid="DoWait">
<h1><span class="secnum">25.4.3.14</span> DoWait ( <var>mode</var>, <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</h1>
<p>The abstract operation DoWait takes arguments <var>mode</var> (<emu-const>sync</emu-const> or <emu-const>async</emu-const>), <var>typedArray</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15180"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>index</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15181"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>value</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15182"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>timeout</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15183"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15184"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either an Object, <emu-val>"not-equal"</emu-val>, <emu-val>"timed-out"</emu-val>, or <emu-val>"ok"</emu-val>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15185"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>taRecord</var> be ?&nbsp;<emu-xref aoid="ValidateIntegerTypedArray" id="_ref_15186"><a href="structured-data.html#sec-validateintegertypedarray">ValidateIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <emu-val>true</emu-val>).</li><li>Let <var>buffer</var> be <var>taRecord</var>.<var class="field">[[Object]]</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_15187"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccess" id="_ref_15188"><a href="structured-data.html#sec-validateatomicaccess" class="e-user-code">ValidateAtomicAccess</a></emu-xref>(<var>taRecord</var>, <var>index</var>).</li><li>Let <var>arrayTypeName</var> be <var>typedArray</var>.<var class="field">[[TypedArrayName]]</var>.</li><li>If <var>arrayTypeName</var> is <emu-val>"BigInt64Array"</emu-val>, let <var>v</var> be ?&nbsp;<emu-xref aoid="ToBigInt64" id="_ref_15189"><a href="abstract-operations.html#sec-tobigint64" class="e-user-code">ToBigInt64</a></emu-xref>(<var>value</var>).</li><li>Else, let <var>v</var> be ?&nbsp;<emu-xref aoid="ToInt32" id="_ref_15190"><a href="abstract-operations.html#sec-toint32" class="e-user-code">ToInt32</a></emu-xref>(<var>value</var>).</li><li>Let <var>q</var> be ?&nbsp;<emu-xref aoid="ToNumber" id="_ref_15191"><a href="abstract-operations.html#sec-tonumber" class="e-user-code">ToNumber</a></emu-xref>(<var>timeout</var>).</li><li>If <var>q</var> is either <emu-val>NaN</emu-val> or <emu-val>+∞</emu-val><sub>𝔽</sub>, let <var>t</var> be +∞.</li><li>Else if <var>q</var> is <emu-val>-∞</emu-val><sub>𝔽</sub>, let <var>t</var> be 0.</li><li>Else, let <var>t</var> be <emu-xref aoid="max" id="_ref_15192"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<emu-xref aoid="ℝ" id="_ref_15193"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(<var>q</var>), 0).</li><li>If <var>mode</var> is <emu-const>sync</emu-const> and <emu-xref aoid="AgentCanSuspend" id="_ref_15194"><a href="executable-code-and-execution-contexts.html#sec-agentcansuspend">AgentCanSuspend</a></emu-xref>() is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>block</var> be <var>buffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>Let <var>WL</var> be <emu-xref aoid="GetWaiterList" id="_ref_15195"><a href="structured-data.html#sec-getwaiterlist">GetWaiterList</a></emu-xref>(<var>block</var>, <var>byteIndexInBuffer</var>).</li><li>If <var>mode</var> is <emu-const>sync</emu-const>, then<ol><li>Let <var>promiseCapability</var> be <emu-const>blocking</emu-const>.</li><li>Let <var>resultObject</var> be <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>promiseCapability</var> be !&nbsp;<emu-xref aoid="NewPromiseCapability" id="_ref_15196"><a href="control-abstraction-objects.html#sec-newpromisecapability">NewPromiseCapability</a></emu-xref>(<emu-xref href="#sec-promise-constructor" id="_ref_15197"><a href="control-abstraction-objects.html#sec-promise-constructor">%Promise%</a></emu-xref>).</li><li>Let <var>resultObject</var> be <emu-xref aoid="OrdinaryObjectCreate" id="_ref_15198"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryobjectcreate">OrdinaryObjectCreate</a></emu-xref>(<emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_15199"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>).</li></ol></li><li>Perform <emu-xref aoid="EnterCriticalSection" id="_ref_15200"><a href="structured-data.html#sec-entercriticalsection">EnterCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Let <var>elementType</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15201"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>w</var> be <emu-xref aoid="GetValueFromBuffer" id="_ref_15202"><a href="structured-data.html#sec-getvaluefrombuffer">GetValueFromBuffer</a></emu-xref>(<var>buffer</var>, <var>byteIndexInBuffer</var>, <var>elementType</var>, <emu-val>true</emu-val>, <emu-const>seq-cst</emu-const>).</li><li>If <var>v</var> ≠ <var>w</var>, then<ol><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15203"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>If <var>mode</var> is <emu-const>sync</emu-const>, return <emu-val>"not-equal"</emu-val>.</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15204"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"async"</emu-val>, <emu-val>false</emu-val>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15205"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"value"</emu-val>, <emu-val>"not-equal"</emu-val>).</li><li>Return <var>resultObject</var>.</li></ol></li><li>If <var>t</var> = 0 and <var>mode</var> is <emu-const>async</emu-const>, then<ol><li>NOTE: There is no special handling of synchronous immediate timeouts. Asynchronous immediate timeouts have special handling in order to fail fast and avoid unnecessary Promise jobs.</li><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15206"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15207"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"async"</emu-val>, <emu-val>false</emu-val>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15208"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"value"</emu-val>, <emu-val>"timed-out"</emu-val>).</li><li>Return <var>resultObject</var>.</li></ol></li><li>Let <var>thisAgent</var> be <emu-xref aoid="AgentSignifier" id="_ref_15209"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>Let <var>now</var> be the <emu-xref href="#sec-time-values-and-time-range" id="_ref_15210"><a href="numbers-and-dates.html#sec-time-values-and-time-range">time value</a></emu-xref> (UTC) identifying the current time.</li><li>Let <var>additionalTimeout</var> be an <emu-xref href="#implementation-defined" id="_ref_15211"><a href="overview.html#implementation-defined">implementation-defined</a></emu-xref> non-negative <emu-xref href="#mathematical-value" id="_ref_15212"><a href="notational-conventions.html#mathematical-value">mathematical value</a></emu-xref>.</li><li>Let <var>timeoutTime</var> be <emu-xref aoid="ℝ" id="_ref_15213"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(<var>now</var>) + <var>t</var> + <var>additionalTimeout</var>.</li><li>NOTE: When <var>t</var> is +∞, <var>timeoutTime</var> is also +∞.</li><li>Let <var>waiterRecord</var> be a new <emu-xref href="#sec-waiter-record" id="_ref_15214"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref> { <var class="field">[[AgentSignifier]]</var>: <var>thisAgent</var>, <var class="field">[[PromiseCapability]]</var>: <var>promiseCapability</var>, <var class="field">[[TimeoutTime]]</var>: <var>timeoutTime</var>, <var class="field">[[Result]]</var>: <emu-val>"ok"</emu-val>&nbsp;}.</li><li>Perform <emu-xref aoid="AddWaiter" id="_ref_15215"><a href="structured-data.html#sec-addwaiter">AddWaiter</a></emu-xref>(<var>WL</var>, <var>waiterRecord</var>).</li><li>If <var>mode</var> is <emu-const>sync</emu-const>, then<ol><li>Perform <emu-xref aoid="SuspendThisAgent" id="_ref_15216"><a href="structured-data.html#sec-suspendthisagent">SuspendThisAgent</a></emu-xref>(<var>WL</var>, <var>waiterRecord</var>).</li></ol></li><li>Else if <var>timeoutTime</var> is <emu-xref href="#finite" id="_ref_15217"><a href="ecmascript-data-types-and-values.html#finite">finite</a></emu-xref>, then<ol><li>Perform <emu-xref aoid="EnqueueAtomicsWaitAsyncTimeoutJob" id="_ref_15218"><a href="structured-data.html#sec-enqueueatomicswaitasynctimeoutjob">EnqueueAtomicsWaitAsyncTimeoutJob</a></emu-xref>(<var>WL</var>, <var>waiterRecord</var>).</li></ol></li><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15219"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>If <var>mode</var> is <emu-const>sync</emu-const>, return <var>waiterRecord</var>.<var class="field">[[Result]]</var>.</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15220"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"async"</emu-val>, <emu-val>true</emu-val>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15221"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>resultObject</var>, <emu-val>"value"</emu-val>, <var>promiseCapability</var>.<var class="field">[[Promise]]</var>).</li><li>Return <var>resultObject</var>.</li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p><var>additionalTimeout</var> allows implementations to pad timeouts as necessary, such as for reducing power consumption or coarsening timer resolution to mitigate timing attacks. This value may differ from call to call of DoWait.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-enqueueatomicswaitasynctimeoutjob" type="abstract operation" aoid="EnqueueAtomicsWaitAsyncTimeoutJob">
<h1><span class="secnum">25.4.3.15</span> EnqueueAtomicsWaitAsyncTimeoutJob ( <var>WL</var>, <var>waiterRecord</var> )</h1>
<p>The abstract operation EnqueueAtomicsWaitAsyncTimeoutJob takes arguments <var>WL</var> (a <emu-xref href="#sec-waiterlist-records" id="_ref_15222"><a href="structured-data.html#sec-waiterlist-records">WaiterList Record</a></emu-xref>) and <var>waiterRecord</var> (a <emu-xref href="#sec-waiter-record" id="_ref_15223"><a href="structured-data.html#sec-waiter-record">Waiter Record</a></emu-xref>) and returns <emu-const>unused</emu-const>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>timeoutJob</var> be a new <emu-xref href="#job" id="_ref_15224"><a href="executable-code-and-execution-contexts.html#job">Job</a></emu-xref> <emu-xref href="#sec-abstract-closure" id="_ref_15225"><a href="ecmascript-data-types-and-values.html#sec-abstract-closure">Abstract Closure</a></emu-xref> with no parameters that captures <var>WL</var> and <var>waiterRecord</var> and performs the following steps when called:<ol><li>Perform <emu-xref aoid="EnterCriticalSection" id="_ref_15226"><a href="structured-data.html#sec-entercriticalsection">EnterCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>If <var>WL</var>.<var class="field">[[Waiters]]</var> contains <var>waiterRecord</var>, then<ol><li>Let <var>timeOfJobExecution</var> be the <emu-xref href="#sec-time-values-and-time-range" id="_ref_15227"><a href="numbers-and-dates.html#sec-time-values-and-time-range">time value</a></emu-xref> (UTC) identifying the current time.</li><li><emu-xref href="#assert" id="_ref_15228"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <emu-xref aoid="ℝ" id="_ref_15229"><a href="notational-conventions.html#%E2%84%9D">ℝ</a></emu-xref>(<var>timeOfJobExecution</var>) ≥ <var>waiterRecord</var>.<var class="field">[[TimeoutTime]]</var> (ignoring potential non-monotonicity of <emu-xref href="#sec-time-values-and-time-range" id="_ref_15230"><a href="numbers-and-dates.html#sec-time-values-and-time-range">time values</a></emu-xref>).</li><li>Set <var>waiterRecord</var>.<var class="field">[[Result]]</var> to <emu-val>"timed-out"</emu-val>.</li><li>Perform <emu-xref aoid="RemoveWaiter" id="_ref_15231"><a href="structured-data.html#sec-removewaiter">RemoveWaiter</a></emu-xref>(<var>WL</var>, <var>waiterRecord</var>).</li><li>Perform <emu-xref aoid="NotifyWaiter" id="_ref_15232"><a href="structured-data.html#sec-notifywaiter">NotifyWaiter</a></emu-xref>(<var>WL</var>, <var>waiterRecord</var>).</li></ol></li><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15233"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Return <emu-const>unused</emu-const>.</li></ol></li><li>Let <var>now</var> be the <emu-xref href="#sec-time-values-and-time-range" id="_ref_15234"><a href="numbers-and-dates.html#sec-time-values-and-time-range">time value</a></emu-xref> (UTC) identifying the current time.</li><li>Let <var>currentRealm</var> be <emu-xref href="#current-realm" id="_ref_15235"><a href="executable-code-and-execution-contexts.html#current-realm">the current Realm Record</a></emu-xref>.</li><li>Perform <emu-xref aoid="HostEnqueueTimeoutJob" id="_ref_15236"><a href="executable-code-and-execution-contexts.html#sec-hostenqueuetimeoutjob">HostEnqueueTimeoutJob</a></emu-xref>(<var>timeoutJob</var>, <var>currentRealm</var>, <emu-xref aoid="𝔽" id="_ref_15237"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>waiterRecord</var>.<var class="field">[[TimeoutTime]]</var>) - <var>now</var>).</li><li>Return <emu-const>unused</emu-const>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomiccompareexchangeinsharedblock" type="abstract operation" aoid="AtomicCompareExchangeInSharedBlock">
<h1><span class="secnum">25.4.3.16</span> AtomicCompareExchangeInSharedBlock ( <var>block</var>, <var>byteIndexInBuffer</var>, <var>elementSize</var>, <var>expectedBytes</var>, <var>replacementBytes</var> )</h1>
<p>The abstract operation AtomicCompareExchangeInSharedBlock takes arguments <var>block</var> (a <emu-xref href="#sec-data-blocks" id="_ref_15238"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">Shared Data Block</a></emu-xref>), <var>byteIndexInBuffer</var> (an <emu-xref href="#integer" id="_ref_15239"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>elementSize</var> (a non-negative <emu-xref href="#integer" id="_ref_15240"><a href="notational-conventions.html#integer">integer</a></emu-xref>), <var>expectedBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15241"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15242"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>), and <var>replacementBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15243"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15244"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>) and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15245"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15246"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15247"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15248"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>execution</var> be <var>AR</var>.<var class="field">[[CandidateExecution]]</var>.</li><li>Let <var>eventsRecord</var> be the <emu-xref href="#sec-agent-event-records" id="_ref_15249"><a href="memory-model.html#sec-agent-event-records">Agent Events Record</a></emu-xref> of <var>execution</var>.<var class="field">[[EventsRecords]]</var> whose <var class="field">[[AgentSignifier]]</var> is <emu-xref aoid="AgentSignifier" id="_ref_15250"><a href="executable-code-and-execution-contexts.html#sec-agentsignifier">AgentSignifier</a></emu-xref>().</li><li>Let <var>rawBytesRead</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15251"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of length <var>elementSize</var> whose elements are nondeterministically chosen <emu-xref href="#sec-data-blocks" id="_ref_15252"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>.</li><li>NOTE: In implementations, <var>rawBytesRead</var> is the result of a load-link, of a load-exclusive, or of an operand of a read-modify-write instruction on the underlying hardware. The nondeterminism is a semantic prescription of the <emu-xref href="#sec-memory-model" id="_ref_15253"><a href="memory-model.html#sec-memory-model">memory model</a></emu-xref> to describe observable behaviour of hardware with weak consistency.</li><li>NOTE: The comparison of the expected value and the read value is performed outside of the <emu-xref href="#sec-arraybuffer-notation" id="_ref_15254"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> to avoid needlessly strong synchronization when the expected value is not equal to the read value.</li><li>If <emu-xref aoid="ByteListEqual" id="_ref_15255"><a href="structured-data.html#sec-bytelistequal">ByteListEqual</a></emu-xref>(<var>rawBytesRead</var>, <var>expectedBytes</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>second</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15256"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>oldBytes</var>, <var>newBytes</var>) that captures nothing and performs the following steps atomically when called:<ol><li>Return <var>newBytes</var>.</li></ol></li><li>Let <var>event</var> be <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15257"><a href="memory-model.html#sec-memory-model-fundamentals">ReadModifyWriteSharedMemory</a></emu-xref> { <var class="field">[[Order]]</var>: <emu-const>seq-cst</emu-const>, <var class="field">[[NoTear]]</var>: <emu-val>true</emu-val>, <var class="field">[[Block]]</var>: <var>block</var>, <var class="field">[[ByteIndex]]</var>: <var>byteIndexInBuffer</var>, <var class="field">[[ElementSize]]</var>: <var>elementSize</var>, <var class="field">[[Payload]]</var>: <var>replacementBytes</var>, <var class="field">[[ModifyOp]]</var>: <var>second</var>&nbsp;}.</li></ol></li><li>Else,<ol><li>Let <var>event</var> be <emu-xref href="#sec-memory-model-fundamentals" id="_ref_15258"><a href="memory-model.html#sec-memory-model-fundamentals">ReadSharedMemory</a></emu-xref> { <var class="field">[[Order]]</var>: <emu-const>seq-cst</emu-const>, <var class="field">[[NoTear]]</var>: <emu-val>true</emu-val>, <var class="field">[[Block]]</var>: <var>block</var>, <var class="field">[[ByteIndex]]</var>: <var>byteIndexInBuffer</var>, <var class="field">[[ElementSize]]</var>: <var>elementSize</var>&nbsp;}.</li></ol></li><li>Append <var>event</var> to <var>eventsRecord</var>.<var class="field">[[EventList]]</var>.</li><li>Append <emu-xref href="#sec-chosen-value-records" id="_ref_15259"><a href="memory-model.html#sec-chosen-value-records">Chosen Value Record</a></emu-xref> { <var class="field">[[Event]]</var>: <var>event</var>, <var class="field">[[ChosenValue]]</var>: <var>rawBytesRead</var>&nbsp;} to <var>execution</var>.<var class="field">[[ChosenValues]]</var>.</li><li>Return <var>rawBytesRead</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomicreadmodifywrite" type="abstract operation" aoid="AtomicReadModifyWrite">
<h1><span class="secnum">25.4.3.17</span> AtomicReadModifyWrite ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>op</var> )</h1>
<p>The abstract operation AtomicReadModifyWrite takes arguments <var>typedArray</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15260"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>index</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15261"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>value</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15262"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>op</var> (a <emu-xref href="#sec-arraybuffer-notation" id="_ref_15263"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15264"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either a Number or a BigInt, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15265"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. <var>op</var> takes two <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15266"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15267"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref> arguments and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15268"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15269"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. This operation atomically loads a value, combines it with another value, and stores the combination. It returns the loaded value. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccessOnIntegerTypedArray" id="_ref_15270"><a href="structured-data.html#sec-validateatomicaccessonintegertypedarray" class="e-user-code">ValidateAtomicAccessOnIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <var>index</var>).</li><li>If <var>typedArray</var>.<var class="field">[[ContentType]]</var> is <emu-const>bigint</emu-const>, let <var>v</var> be ?&nbsp;<emu-xref aoid="ToBigInt" id="_ref_15271"><a href="abstract-operations.html#sec-tobigint" class="e-user-code">ToBigInt</a></emu-xref>(<var>value</var>).</li><li>Else, let <var>v</var> be <emu-xref aoid="𝔽" id="_ref_15272"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(? <emu-xref aoid="ToIntegerOrInfinity" id="_ref_15273"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>value</var>)).</li><li>Perform ?&nbsp;<emu-xref aoid="RevalidateAtomicAccess" id="_ref_15274"><a href="structured-data.html#sec-revalidateatomicaccess">RevalidateAtomicAccess</a></emu-xref>(<var>typedArray</var>, <var>byteIndexInBuffer</var>).</li><li>Let <var>buffer</var> be <var>typedArray</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Let <var>elementType</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15275"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Return <emu-xref aoid="GetModifySetValueInBuffer" id="_ref_15276"><a href="structured-data.html#sec-getmodifysetvalueinbuffer">GetModifySetValueInBuffer</a></emu-xref>(<var>buffer</var>, <var>byteIndexInBuffer</var>, <var>elementType</var>, <var>v</var>, <var>op</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-bytelistbitwiseop" type="abstract operation" aoid="ByteListBitwiseOp">
<h1><span class="secnum">25.4.3.18</span> ByteListBitwiseOp ( <var>op</var>, <var>xBytes</var>, <var>yBytes</var> )</h1>
<p>The abstract operation ByteListBitwiseOp takes arguments <var>op</var> (<code>&amp;</code>, <code>^</code>, or <code>|</code>), <var>xBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15277"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15278"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>), and <var>yBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15279"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15280"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>) and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15281"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15282"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. The operation atomically performs a bitwise operation on all <emu-xref href="#sec-data-blocks" id="_ref_15283"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref> of the arguments and returns a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15284"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15285"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li><emu-xref href="#assert" id="_ref_15286"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>xBytes</var> and <var>yBytes</var> have the same number of elements.</li><li>Let <var>result</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15287"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>i</var> be 0.</li><li>For each element <var>xByte</var> of <var>xBytes</var>, do<ol><li>Let <var>yByte</var> be <var>yBytes</var>[<var>i</var>].</li><li>If <var>op</var> is <code>&amp;</code>, then<ol><li>Let <var>resultByte</var> be the result of applying the bitwise AND operation to <var>xByte</var> and <var>yByte</var>.</li></ol></li><li>Else if <var>op</var> is <code>^</code>, then<ol><li>Let <var>resultByte</var> be the result of applying the bitwise exclusive OR (XOR) operation to <var>xByte</var> and <var>yByte</var>.</li></ol></li><li>Else,<ol><li><emu-xref href="#assert" id="_ref_15288"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>op</var> is <code>|</code>.</li><li>Let <var>resultByte</var> be the result of applying the bitwise inclusive OR operation to <var>xByte</var> and <var>yByte</var>.</li></ol></li><li>Set <var>i</var> to <var>i</var> + 1.</li><li>Append <var>resultByte</var> to <var>result</var>.</li></ol></li><li>Return <var>result</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-bytelistequal" type="abstract operation" aoid="ByteListEqual">
<h1><span class="secnum">25.4.3.19</span> ByteListEqual ( <var>xBytes</var>, <var>yBytes</var> )</h1>
<p>The abstract operation ByteListEqual takes arguments <var>xBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15289"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15290"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>) and <var>yBytes</var> (a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15291"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-data-blocks" id="_ref_15292"><a href="ecmascript-data-types-and-values.html#sec-data-blocks">byte values</a></emu-xref>) and returns a Boolean. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>xBytes</var> and <var>yBytes</var> do not have the same number of elements, return <emu-val>false</emu-val>.</li><li>Let <var>i</var> be 0.</li><li>For each element <var>xByte</var> of <var>xBytes</var>, do<ol><li>Let <var>yByte</var> be <var>yBytes</var>[<var>i</var>].</li><li>If <var>xByte</var> ≠ <var>yByte</var>, return <emu-val>false</emu-val>.</li><li>Set <var>i</var> to <var>i</var> + 1.</li></ol></li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-atomics.add" type="built-in function">
<h1><span class="secnum">25.4.4</span> Atomics.add ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>add</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15293"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>xBytes</var>, <var>yBytes</var>) that captures <var>typedArray</var> and performs the following steps atomically when called:<ol><li>Let <var>type</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15294"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15295"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15296"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Let <var>x</var> be <emu-xref aoid="RawBytesToNumeric" id="_ref_15297"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>xBytes</var>, <var>isLittleEndian</var>).</li><li>Let <var>y</var> be <emu-xref aoid="RawBytesToNumeric" id="_ref_15298"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>yBytes</var>, <var>isLittleEndian</var>).</li><li>If <var>x</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_15299"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, then<ol><li>Let <var>sum</var> be <emu-xref aoid="Number::add" id="_ref_15300"><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-add">Number::add</a></emu-xref>(<var>x</var>, <var>y</var>).</li></ol></li><li>Else,<ol><li><emu-xref href="#assert" id="_ref_15301"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>x</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_15302"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref>.</li><li>Let <var>sum</var> be <emu-xref aoid="BigInt::add" id="_ref_15303"><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-add">BigInt::add</a></emu-xref>(<var>x</var>, <var>y</var>).</li></ol></li><li>Let <var>sumBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_15304"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>type</var>, <var>sum</var>, <var>isLittleEndian</var>).</li><li><emu-xref href="#assert" id="_ref_15305"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>sumBytes</var>, <var>xBytes</var>, and <var>yBytes</var> have the same number of elements.</li><li>Return <var>sumBytes</var>.</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15306"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>add</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.and" type="built-in function">
<h1><span class="secnum">25.4.5</span> Atomics.and ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>and</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15307"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>xBytes</var>, <var>yBytes</var>) that captures nothing and performs the following steps atomically when called:<ol><li>Return <emu-xref aoid="ByteListBitwiseOp" id="_ref_15308"><a href="structured-data.html#sec-bytelistbitwiseop">ByteListBitwiseOp</a></emu-xref>(<code>&amp;</code>, <var>xBytes</var>, <var>yBytes</var>).</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15309"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>and</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.compareexchange" type="built-in function">
<h1><span class="secnum">25.4.6</span> Atomics.compareExchange ( <var>typedArray</var>, <var>index</var>, <var>expectedValue</var>, <var>replacementValue</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccessOnIntegerTypedArray" id="_ref_15310"><a href="structured-data.html#sec-validateatomicaccessonintegertypedarray" class="e-user-code">ValidateAtomicAccessOnIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <var>index</var>).</li><li>Let <var>buffer</var> be <var>typedArray</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Let <var>block</var> be <var>buffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>If <var>typedArray</var>.<var class="field">[[ContentType]]</var> is <emu-const>bigint</emu-const>, then<ol><li>Let <var>expected</var> be ?&nbsp;<emu-xref aoid="ToBigInt" id="_ref_15311"><a href="abstract-operations.html#sec-tobigint" class="e-user-code">ToBigInt</a></emu-xref>(<var>expectedValue</var>).</li><li>Let <var>replacement</var> be ?&nbsp;<emu-xref aoid="ToBigInt" id="_ref_15312"><a href="abstract-operations.html#sec-tobigint" class="e-user-code">ToBigInt</a></emu-xref>(<var>replacementValue</var>).</li></ol></li><li>Else,<ol><li>Let <var>expected</var> be <emu-xref aoid="𝔽" id="_ref_15313"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(? <emu-xref aoid="ToIntegerOrInfinity" id="_ref_15314"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>expectedValue</var>)).</li><li>Let <var>replacement</var> be <emu-xref aoid="𝔽" id="_ref_15315"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(? <emu-xref aoid="ToIntegerOrInfinity" id="_ref_15316"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>replacementValue</var>)).</li></ol></li><li>Perform ?&nbsp;<emu-xref aoid="RevalidateAtomicAccess" id="_ref_15317"><a href="structured-data.html#sec-revalidateatomicaccess">RevalidateAtomicAccess</a></emu-xref>(<var>typedArray</var>, <var>byteIndexInBuffer</var>).</li><li>Let <var>elementType</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15318"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>elementSize</var> be <emu-xref aoid="TypedArrayElementSize" id="_ref_15319"><a href="indexed-collections.html#sec-typedarrayelementsize">TypedArrayElementSize</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15320"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15321"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Let <var>expectedBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_15322"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>elementType</var>, <var>expected</var>, <var>isLittleEndian</var>).</li><li>Let <var>replacementBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_15323"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>elementType</var>, <var>replacement</var>, <var>isLittleEndian</var>).</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_15324"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>rawBytesRead</var> be <emu-xref aoid="AtomicCompareExchangeInSharedBlock" id="_ref_15325"><a href="structured-data.html#sec-atomiccompareexchangeinsharedblock">AtomicCompareExchangeInSharedBlock</a></emu-xref>(<var>block</var>, <var>byteIndexInBuffer</var>, <var>elementSize</var>, <var>expectedBytes</var>, <var>replacementBytes</var>).</li></ol></li><li>Else,<ol><li>Let <var>rawBytesRead</var> be a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15326"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of length <var>elementSize</var> whose elements are the sequence of <var>elementSize</var> bytes starting with <var>block</var>[<var>byteIndexInBuffer</var>].</li><li>If <emu-xref aoid="ByteListEqual" id="_ref_15327"><a href="structured-data.html#sec-bytelistequal">ByteListEqual</a></emu-xref>(<var>rawBytesRead</var>, <var>expectedBytes</var>) is <emu-val>true</emu-val>, then<ol><li>Store the individual bytes of <var>replacementBytes</var> into <var>block</var>, starting at <var>block</var>[<var>byteIndexInBuffer</var>].</li></ol></li></ol></li><li>Return <emu-xref aoid="RawBytesToNumeric" id="_ref_15328"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>elementType</var>, <var>rawBytesRead</var>, <var>isLittleEndian</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.exchange" type="built-in function">
<h1><span class="secnum">25.4.7</span> Atomics.exchange ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>second</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15329"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>oldBytes</var>, <var>newBytes</var>) that captures nothing and performs the following steps atomically when called:<ol><li>Return <var>newBytes</var>.</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15330"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>second</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.islockfree" type="built-in function">
<h1><span class="secnum">25.4.8</span> Atomics.isLockFree ( <var>size</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>n</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_15331"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>size</var>).</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15332"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15333"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>If <var>n</var> = 1, return <var>AR</var>.<var class="field">[[IsLockFree1]]</var>.</li><li>If <var>n</var> = 2, return <var>AR</var>.<var class="field">[[IsLockFree2]]</var>.</li><li>If <var>n</var> = 4, return <emu-val>true</emu-val>.</li><li>If <var>n</var> = 8, return <var>AR</var>.<var class="field">[[IsLockFree8]]</var>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>This function is an optimization primitive. The intuition is that if the atomic step of an atomic primitive (<code>compareExchange</code>, <code>load</code>, <code>store</code>, <code>add</code>, <code>sub</code>, <code>and</code>, <code>or</code>, <code>xor</code>, or <code>exchange</code>) on a datum of size <var>n</var> bytes will be performed without the <emu-xref href="#surrounding-agent" id="_ref_15334"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> acquiring a lock outside the <var>n</var> bytes comprising the datum, then <code>Atomics.isLockFree</code>(<var>n</var>) will return <emu-val>true</emu-val>. High-performance algorithms will use this function to determine whether to use locks or atomic operations in <emu-xref href="#sec-waiterlist-records" id="_ref_15335"><a href="structured-data.html#sec-waiterlist-records">critical sections</a></emu-xref>. If an atomic primitive is not lock-free then it is often more efficient for an algorithm to provide its own locking.</p>
<p><code>Atomics.isLockFree</code>(4) always returns <emu-val>true</emu-val> as that can be supported on all known relevant hardware. Being able to assume this will generally simplify programs.</p>
<p>Regardless of the value returned by this function, all atomic operations are guaranteed to be atomic. For example, they will never have a visible operation take place in the middle of the operation (e.g., "tearing").</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-atomics.load" oldids="sec-atomicload" type="built-in function"><span id="sec-atomicload"></span>
<h1><span class="secnum">25.4.9</span> Atomics.load ( <var>typedArray</var>, <var>index</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccessOnIntegerTypedArray" id="_ref_15336"><a href="structured-data.html#sec-validateatomicaccessonintegertypedarray" class="e-user-code">ValidateAtomicAccessOnIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <var>index</var>).</li><li>Perform ?&nbsp;<emu-xref aoid="RevalidateAtomicAccess" id="_ref_15337"><a href="structured-data.html#sec-revalidateatomicaccess">RevalidateAtomicAccess</a></emu-xref>(<var>typedArray</var>, <var>byteIndexInBuffer</var>).</li><li>Let <var>buffer</var> be <var>typedArray</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Let <var>elementType</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15338"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Return <emu-xref aoid="GetValueFromBuffer" id="_ref_15339"><a href="structured-data.html#sec-getvaluefrombuffer">GetValueFromBuffer</a></emu-xref>(<var>buffer</var>, <var>byteIndexInBuffer</var>, <var>elementType</var>, <emu-val>true</emu-val>, <emu-const>seq-cst</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.or" type="built-in function">
<h1><span class="secnum">25.4.10</span> Atomics.or ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>or</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15340"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>xBytes</var>, <var>yBytes</var>) that captures nothing and performs the following steps atomically when called:<ol><li>Return <emu-xref aoid="ByteListBitwiseOp" id="_ref_15341"><a href="structured-data.html#sec-bytelistbitwiseop">ByteListBitwiseOp</a></emu-xref>(<code>|</code>, <var>xBytes</var>, <var>yBytes</var>).</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15342"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>or</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.store" type="built-in function">
<h1><span class="secnum">25.4.11</span> Atomics.store ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccessOnIntegerTypedArray" id="_ref_15343"><a href="structured-data.html#sec-validateatomicaccessonintegertypedarray" class="e-user-code">ValidateAtomicAccessOnIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <var>index</var>).</li><li>If <var>typedArray</var>.<var class="field">[[ContentType]]</var> is <emu-const>bigint</emu-const>, let <var>v</var> be ?&nbsp;<emu-xref aoid="ToBigInt" id="_ref_15344"><a href="abstract-operations.html#sec-tobigint" class="e-user-code">ToBigInt</a></emu-xref>(<var>value</var>).</li><li>Else, let <var>v</var> be <emu-xref aoid="𝔽" id="_ref_15345"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(? <emu-xref aoid="ToIntegerOrInfinity" id="_ref_15346"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>value</var>)).</li><li>Perform ?&nbsp;<emu-xref aoid="RevalidateAtomicAccess" id="_ref_15347"><a href="structured-data.html#sec-revalidateatomicaccess">RevalidateAtomicAccess</a></emu-xref>(<var>typedArray</var>, <var>byteIndexInBuffer</var>).</li><li>Let <var>buffer</var> be <var>typedArray</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Let <var>elementType</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15348"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Perform <emu-xref aoid="SetValueInBuffer" id="_ref_15349"><a href="structured-data.html#sec-setvalueinbuffer">SetValueInBuffer</a></emu-xref>(<var>buffer</var>, <var>byteIndexInBuffer</var>, <var>elementType</var>, <var>v</var>, <emu-val>true</emu-val>, <emu-const>seq-cst</emu-const>).</li><li>Return <var>v</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.sub" type="built-in function">
<h1><span class="secnum">25.4.12</span> Atomics.sub ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>subtract</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15350"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>xBytes</var>, <var>yBytes</var>) that captures <var>typedArray</var> and performs the following steps atomically when called:<ol><li>Let <var>type</var> be <emu-xref aoid="TypedArrayElementType" id="_ref_15351"><a href="indexed-collections.html#sec-typedarrayelementtype">TypedArrayElementType</a></emu-xref>(<var>typedArray</var>).</li><li>Let <var>AR</var> be the <emu-xref href="#agent-record" id="_ref_15352"><a href="executable-code-and-execution-contexts.html#agent-record">Agent Record</a></emu-xref> of the <emu-xref href="#surrounding-agent" id="_ref_15353"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref>.</li><li>Let <var>isLittleEndian</var> be <var>AR</var>.<var class="field">[[LittleEndian]]</var>.</li><li>Let <var>x</var> be <emu-xref aoid="RawBytesToNumeric" id="_ref_15354"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>xBytes</var>, <var>isLittleEndian</var>).</li><li>Let <var>y</var> be <emu-xref aoid="RawBytesToNumeric" id="_ref_15355"><a href="structured-data.html#sec-rawbytestonumeric">RawBytesToNumeric</a></emu-xref>(<var>type</var>, <var>yBytes</var>, <var>isLittleEndian</var>).</li><li>If <var>x</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_15356"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, then<ol><li>Let <var>difference</var> be <emu-xref aoid="Number::subtract" id="_ref_15357"><a href="ecmascript-data-types-and-values.html#sec-numeric-types-number-subtract">Number::subtract</a></emu-xref>(<var>x</var>, <var>y</var>).</li></ol></li><li>Else,<ol><li><emu-xref href="#assert" id="_ref_15358"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>x</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_15359"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref>.</li><li>Let <var>difference</var> be <emu-xref aoid="BigInt::subtract" id="_ref_15360"><a href="ecmascript-data-types-and-values.html#sec-numeric-types-bigint-subtract">BigInt::subtract</a></emu-xref>(<var>x</var>, <var>y</var>).</li></ol></li><li>Let <var>differenceBytes</var> be <emu-xref aoid="NumericToRawBytes" id="_ref_15361"><a href="structured-data.html#sec-numerictorawbytes">NumericToRawBytes</a></emu-xref>(<var>type</var>, <var>difference</var>, <var>isLittleEndian</var>).</li><li><emu-xref href="#assert" id="_ref_15362"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>differenceBytes</var>, <var>xBytes</var>, and <var>yBytes</var> have the same number of elements.</li><li>Return <var>differenceBytes</var>.</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15363"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>subtract</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.wait" type="built-in function">
<h1><span class="secnum">25.4.13</span> Atomics.wait ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</h1>
<p>This function puts the <emu-xref href="#surrounding-agent" id="_ref_15364"><a href="executable-code-and-execution-contexts.html#surrounding-agent">surrounding agent</a></emu-xref> in a wait queue and suspends it until notified or until the wait times out, returning a String differentiating those cases.</p>
<p>It performs the following steps when called:</p>
<emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="DoWait" id="_ref_15365"><a href="structured-data.html#sec-dowait" class="e-user-code">DoWait</a></emu-xref>(<emu-const>sync</emu-const>, <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.waitasync" type="built-in function">
<h1><span class="secnum">25.4.14</span> Atomics.waitAsync ( <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var> )</h1>
<p>This function returns a Promise that is resolved when the calling <emu-xref href="#agent" id="_ref_15366"><a href="executable-code-and-execution-contexts.html#agent">agent</a></emu-xref> is notified or the timeout is reached.</p>
<p>It performs the following steps when called:</p>
<emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="DoWait" id="_ref_15367"><a href="structured-data.html#sec-dowait" class="e-user-code">DoWait</a></emu-xref>(<emu-const>async</emu-const>, <var>typedArray</var>, <var>index</var>, <var>value</var>, <var>timeout</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.notify" type="built-in function">
<h1><span class="secnum">25.4.15</span> Atomics.notify ( <var>typedArray</var>, <var>index</var>, <var>count</var> )</h1>
<p>This function notifies some <emu-xref href="#agent" id="_ref_15368"><a href="executable-code-and-execution-contexts.html#agent">agents</a></emu-xref> that are sleeping in the wait queue.</p>
<p>It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>taRecord</var> be ?&nbsp;<emu-xref aoid="ValidateIntegerTypedArray" id="_ref_15369"><a href="structured-data.html#sec-validateintegertypedarray">ValidateIntegerTypedArray</a></emu-xref>(<var>typedArray</var>, <emu-val>true</emu-val>).</li><li>Let <var>byteIndexInBuffer</var> be ?&nbsp;<emu-xref aoid="ValidateAtomicAccess" id="_ref_15370"><a href="structured-data.html#sec-validateatomicaccess" class="e-user-code">ValidateAtomicAccess</a></emu-xref>(<var>taRecord</var>, <var>index</var>).</li><li>If <var>count</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>c</var> be +∞.</li></ol></li><li>Else,<ol><li>Let <var>intCount</var> be ?&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_15371"><a href="abstract-operations.html#sec-tointegerorinfinity" class="e-user-code">ToIntegerOrInfinity</a></emu-xref>(<var>count</var>).</li><li>Let <var>c</var> be <emu-xref aoid="max" id="_ref_15372"><a href="notational-conventions.html#eqn-max">max</a></emu-xref>(<var>intCount</var>, 0).</li></ol></li><li>Let <var>buffer</var> be <var>typedArray</var>.<var class="field">[[ViewedArrayBuffer]]</var>.</li><li>Let <var>block</var> be <var>buffer</var>.<var class="field">[[ArrayBufferData]]</var>.</li><li>If <emu-xref aoid="IsSharedArrayBuffer" id="_ref_15373"><a href="structured-data.html#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>buffer</var>) is <emu-val>false</emu-val>, return <emu-val>+0</emu-val><sub>𝔽</sub>.</li><li>Let <var>WL</var> be <emu-xref aoid="GetWaiterList" id="_ref_15374"><a href="structured-data.html#sec-getwaiterlist">GetWaiterList</a></emu-xref>(<var>block</var>, <var>byteIndexInBuffer</var>).</li><li>Perform <emu-xref aoid="EnterCriticalSection" id="_ref_15375"><a href="structured-data.html#sec-entercriticalsection">EnterCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Let <var>S</var> be <emu-xref aoid="RemoveWaiters" id="_ref_15376"><a href="structured-data.html#sec-removewaiters">RemoveWaiters</a></emu-xref>(<var>WL</var>, <var>c</var>).</li><li>For each element <var>W</var> of <var>S</var>, do<ol><li>Perform <emu-xref aoid="NotifyWaiter" id="_ref_15377"><a href="structured-data.html#sec-notifywaiter">NotifyWaiter</a></emu-xref>(<var>WL</var>, <var>W</var>).</li></ol></li><li>Perform <emu-xref aoid="LeaveCriticalSection" id="_ref_15378"><a href="structured-data.html#sec-leavecriticalsection">LeaveCriticalSection</a></emu-xref>(<var>WL</var>).</li><li>Let <var>n</var> be the number of elements in <var>S</var>.</li><li>Return <emu-xref aoid="𝔽" id="_ref_15379"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>n</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-atomics.xor" type="built-in function">
<h1><span class="secnum">25.4.16</span> Atomics.xor ( <var>typedArray</var>, <var>index</var>, <var>value</var> )</h1>
<p>This function performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>xor</var> be a new <emu-xref href="#sec-arraybuffer-notation" id="_ref_15380"><a href="structured-data.html#sec-arraybuffer-notation">read-modify-write modification function</a></emu-xref> with parameters (<var>xBytes</var>, <var>yBytes</var>) that captures nothing and performs the following steps atomically when called:<ol><li>Return <emu-xref aoid="ByteListBitwiseOp" id="_ref_15381"><a href="structured-data.html#sec-bytelistbitwiseop">ByteListBitwiseOp</a></emu-xref>(<code>^</code>, <var>xBytes</var>, <var>yBytes</var>).</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="AtomicReadModifyWrite" id="_ref_15382"><a href="structured-data.html#sec-atomicreadmodifywrite" class="e-user-code">AtomicReadModifyWrite</a></emu-xref>(<var>typedArray</var>, <var>index</var>, <var>value</var>, <var>xor</var>).</li></ol></emu-alg>
</emu-clause>
<emu-clause oldids="sec-atomics-@@tostringtag" id="sec-atomics-%symbol.tostringtag%"><span id="sec-atomics-@@tostringtag"></span>
<h1><span class="secnum">25.4.17</span> Atomics [ %Symbol.toStringTag% ]</h1>
<p>The initial value of the <emu-xref href="#sec-well-known-symbols" id="_ref_15383"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.toStringTag%</a></emu-xref> property is the String value <emu-val>"Atomics"</emu-val>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>true</emu-val> }.</p>
</emu-clause>
</emu-clause>
<emu-clause id="sec-json-object">
<h1><span class="secnum">25.5</span> The JSON Object</h1>
<p>The JSON object:</p>
<ul>
<li>is <dfn tabindex="-1">%JSON%</dfn>.</li>
<li>is the initial value of the <emu-val>"JSON"</emu-val> property of the <emu-xref href="#sec-global-object" id="_ref_15384"><a href="global-object.html#sec-global-object">global object</a></emu-xref>.</li>
<li>is an <emu-xref href="#ordinary-object" id="_ref_15385"><a href="ecmascript-data-types-and-values.html#ordinary-object">ordinary object</a></emu-xref>.</li>
<li>contains two functions, <code>parse</code> and <code>stringify</code>, that are used to parse and construct JSON texts.</li>
<li>has a <var class="field">[[Prototype]]</var> internal slot whose value is <emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_15386"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>.</li>
<li>does not have a <var class="field">[[Construct]]</var> internal method; it cannot be used as a <emu-xref href="#constructor" id="_ref_15387"><a href="ecmascript-data-types-and-values.html#constructor">constructor</a></emu-xref> with the <code>new</code> operator.</li>
<li>does not have a <var class="field">[[Call]]</var> internal method; it cannot be invoked as a function.</li>
</ul>
<p>The JSON Data Interchange Format is defined in ECMA-404. The JSON interchange format used in this specification is exactly that described by ECMA-404. Conforming implementations of <code>JSON.parse</code> and <code>JSON.stringify</code> must support the exact interchange format described in the ECMA-404 specification without any deletions or extensions to the format.</p>
<emu-clause id="sec-json.parse" type="built-in function">
<h1><span class="secnum">25.5.1</span> JSON.parse ( <var>text</var> [ , <var>reviver</var> ] )</h1>
<p>This function parses a JSON text (a JSON-formatted String) and produces an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15388"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>. The JSON format represents literals, arrays, and objects with a syntax similar to the syntax for ECMAScript literals, Array Initializers, and Object Initializers. After parsing, JSON objects are realized as ECMAScript objects. JSON arrays are realized as ECMAScript Array instances. JSON strings, numbers, booleans, and null are realized as ECMAScript Strings, Numbers, Booleans, and <emu-val>null</emu-val>.</p>
<p>The optional <var>reviver</var> parameter is a function that takes two parameters, <var>key</var> and <var>value</var>. It can filter and transform the results. It is called with each of the <var>key</var>/<var>value</var> pairs produced by the parse, and its return value is used instead of the original value. If it returns what it received, the structure is not modified. If it returns <emu-val>undefined</emu-val> then the property is deleted from the result.</p>
<emu-alg><ol><li>Let <var>jsonString</var> be ?&nbsp;<emu-xref aoid="ToString" id="_ref_15389"><a href="abstract-operations.html#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>text</var>).</li><li>Let <var>unfiltered</var> be ?&nbsp;<emu-xref aoid="ParseJSON" id="_ref_15390"><a href="structured-data.html#sec-ParseJSON">ParseJSON</a></emu-xref>(<var>jsonString</var>).</li><li>If <emu-xref aoid="IsCallable" id="_ref_15391"><a href="abstract-operations.html#sec-iscallable">IsCallable</a></emu-xref>(<var>reviver</var>) is <emu-val>false</emu-val>, return <var>unfiltered</var>.</li><li>Let <var>root</var> be <emu-xref aoid="OrdinaryObjectCreate" id="_ref_15392"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryobjectcreate">OrdinaryObjectCreate</a></emu-xref>(<emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_15393"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>).</li><li>Let <var>rootName</var> be the empty String.</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15394"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>root</var>, <var>rootName</var>, <var>unfiltered</var>).</li><li>Return ?&nbsp;<emu-xref aoid="InternalizeJSONProperty" id="_ref_15395"><a href="structured-data.html#sec-internalizejsonproperty" class="e-user-code">InternalizeJSONProperty</a></emu-xref>(<var>root</var>, <var>rootName</var>, <var>reviver</var>).</li></ol></emu-alg>
<p>The <emu-val>"length"</emu-val> property of this function is <emu-val>2</emu-val><sub>𝔽</sub>.</p>
<emu-clause id="sec-ParseJSON" type="abstract operation" aoid="ParseJSON">
<h1><span class="secnum">25.5.1.1</span> ParseJSON ( <var>text</var> )</h1>
<p>The abstract operation ParseJSON takes argument <var>text</var> (a String) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15396"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15397"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15398"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li id="step-json-parse-validate">If <emu-xref aoid="StringToCodePoints" id="_ref_15399"><a href="ecmascript-language-source-code.html#sec-stringtocodepoints">StringToCodePoints</a></emu-xref>(<var>text</var>) is not a valid JSON text as specified in ECMA-404, throw a <emu-val>SyntaxError</emu-val> exception.</li><li>Let <var>scriptString</var> be the <emu-xref href="#string-concatenation" id="_ref_15400"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <emu-val>"("</emu-val>, <var>text</var>, and <emu-val>");"</emu-val>.</li><li id="step-json-parse-parse">Let <var>script</var> be <emu-xref aoid="ParseText" id="_ref_15401"><a href="ecmascript-language-source-code.html#sec-parsetext">ParseText</a></emu-xref>(<var>scriptString</var>, <emu-nt id="_ref_24549"><a href="ecmascript-language-scripts-and-modules.html#prod-Script">Script</a></emu-nt>).</li><li>NOTE: The <emu-xref href="#early-error" id="_ref_15402"><a href="error-handling-and-language-extensions.html#early-error">early error</a></emu-xref> rules defined in <emu-xref href="#sec-object-initializer-static-semantics-early-errors" id="_ref_808"><a href="ecmascript-language-expressions.html#sec-object-initializer-static-semantics-early-errors">13.2.5.1</a></emu-xref> have special handling for the above invocation of <emu-xref aoid="ParseText" id="_ref_15403"><a href="ecmascript-language-source-code.html#sec-parsetext">ParseText</a></emu-xref>.</li><li><emu-xref href="#assert" id="_ref_15404"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>script</var> is a <emu-xref href="#sec-syntactic-grammar" id="_ref_15405"><a href="notational-conventions.html#sec-syntactic-grammar">Parse Node</a></emu-xref>.</li><li id="step-json-parse-eval">Let <var>result</var> be !&nbsp;<emu-xref aoid="Evaluation" id="_ref_15406"><a href="syntax-directed-operations.html#sec-evaluation">Evaluation</a></emu-xref> of <var>script</var>.</li><li>NOTE: The <emu-xref aoid="PropertyDefinitionEvaluation" id="_ref_15407"><a href="ecmascript-language-expressions.html#sec-runtime-semantics-propertydefinitionevaluation">PropertyDefinitionEvaluation</a></emu-xref> semantics defined in <emu-xref href="#sec-runtime-semantics-propertydefinitionevaluation" id="_ref_809"><a href="ecmascript-language-expressions.html#sec-runtime-semantics-propertydefinitionevaluation">13.2.5.5</a></emu-xref> have special handling for the above evaluation.</li><li id="step-json-parse-assert-type"><emu-xref href="#assert" id="_ref_15408"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>result</var> is either a String, a Number, a Boolean, an Object that is defined by either an <emu-nt id="_ref_24550"><a href="ecmascript-language-expressions.html#prod-ArrayLiteral">ArrayLiteral</a></emu-nt> or an <emu-nt id="_ref_24551"><a href="ecmascript-language-expressions.html#prod-ObjectLiteral">ObjectLiteral</a></emu-nt>, or <emu-val>null</emu-val>.</li><li>Return <var>result</var>.</li></ol></emu-alg>
<p>It is not permitted for a conforming implementation of <code>JSON.parse</code> to extend the JSON grammars. If an implementation wishes to support a modified or extended JSON interchange format it must do so by defining a different parse function.</p>
<emu-note><span class="note">Note 1</span><div class="note-contents">
<p>Valid JSON text is a subset of the ECMAScript <emu-nt id="_ref_24552"><a href="ecmascript-language-expressions.html#prod-PrimaryExpression">PrimaryExpression</a></emu-nt> syntax. Step <emu-xref href="#step-json-parse-validate" id="_ref_810"><a href="structured-data.html#step-json-parse-validate">1</a></emu-xref> verifies that <var>jsonString</var> conforms to that subset, and step <emu-xref href="#step-json-parse-assert-type" id="_ref_811"><a href="structured-data.html#step-json-parse-assert-type">8</a></emu-xref> asserts that evaluation returns a value of an appropriate type.</p>
<p>However, because <emu-xref href="#sec-runtime-semantics-propertydefinitionevaluation" id="_ref_812"><a href="ecmascript-language-expressions.html#sec-runtime-semantics-propertydefinitionevaluation">13.2.5.5</a></emu-xref> behaves differently during ParseJSON, the same source text can produce different results when evaluated as a <emu-nt id="_ref_24553"><a href="ecmascript-language-expressions.html#prod-PrimaryExpression">PrimaryExpression</a></emu-nt> rather than as JSON. Furthermore, the Early Error for duplicate <emu-val>"__proto__"</emu-val> properties in object literals, which likewise does not apply during ParseJSON, means that not all texts accepted by ParseJSON are valid as a <emu-nt id="_ref_24554"><a href="ecmascript-language-expressions.html#prod-PrimaryExpression">PrimaryExpression</a></emu-nt>, despite matching the grammar.</p>
</div></emu-note>
<emu-note><span class="note">Note 2</span><div class="note-contents">
<p>In the case where there are duplicate name Strings within an object, lexically preceding values for the same key shall be overwritten.</p>
</div></emu-note>
</emu-clause>
<emu-clause id="sec-internalizejsonproperty" type="abstract operation" aoid="InternalizeJSONProperty">
<h1><span class="secnum">25.5.1.2</span> InternalizeJSONProperty ( <var>holder</var>, <var>name</var>, <var>reviver</var> )</h1>
<p>The abstract operation InternalizeJSONProperty takes arguments <var>holder</var> (an Object), <var>name</var> (a String), and <var>reviver</var> (a <emu-xref href="#function-object" id="_ref_15409"><a href="ecmascript-data-types-and-values.html#function-object">function object</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15410"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15411"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15412"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>.</p>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>This algorithm intentionally does not throw an exception if either <var class="field">[[Delete]]</var> or <emu-xref aoid="CreateDataProperty" id="_ref_15413"><a href="abstract-operations.html#sec-createdataproperty">CreateDataProperty</a></emu-xref> return <emu-val>false</emu-val>.</p>
</div></emu-note>
<p>It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>val</var> be ?&nbsp;<emu-xref aoid="Get" id="_ref_15414"><a href="abstract-operations.html#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>holder</var>, <var>name</var>).</li><li>If <var>val</var> <emu-xref href="#sec-object-type" id="_ref_15415"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref>, then<ol><li>Let <var>isArray</var> be ?&nbsp;<emu-xref aoid="IsArray" id="_ref_15416"><a href="abstract-operations.html#sec-isarray">IsArray</a></emu-xref>(<var>val</var>).</li><li>If <var>isArray</var> is <emu-val>true</emu-val>, then<ol><li>Let <var>len</var> be ?&nbsp;<emu-xref aoid="LengthOfArrayLike" id="_ref_15417"><a href="abstract-operations.html#sec-lengthofarraylike" class="e-user-code">LengthOfArrayLike</a></emu-xref>(<var>val</var>).</li><li>Let <var>I</var> be 0.</li><li>Repeat, while <var>I</var> &lt; <var>len</var>,<ol><li>Let <var>prop</var> be !&nbsp;<emu-xref aoid="ToString" id="_ref_15418"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<emu-xref aoid="𝔽" id="_ref_15419"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>I</var>)).</li><li>Let <var>newElement</var> be ?&nbsp;<emu-xref aoid="InternalizeJSONProperty" id="_ref_15420"><a href="structured-data.html#sec-internalizejsonproperty" class="e-user-code">InternalizeJSONProperty</a></emu-xref>(<var>val</var>, <var>prop</var>, <var>reviver</var>).</li><li>If <var>newElement</var> is <emu-val>undefined</emu-val>, then<ol><li>Perform ?&nbsp;<span class="e-user-code"><var>val</var>.<var class="field">[[Delete]]</var>(<var>prop</var>)</span>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="CreateDataProperty" id="_ref_15421"><a href="abstract-operations.html#sec-createdataproperty" class="e-user-code">CreateDataProperty</a></emu-xref>(<var>val</var>, <var>prop</var>, <var>newElement</var>).</li></ol></li><li>Set <var>I</var> to <var>I</var> + 1.</li></ol></li></ol></li><li>Else,<ol><li>Let <var>keys</var> be ?&nbsp;<emu-xref aoid="EnumerableOwnProperties" id="_ref_15422"><a href="abstract-operations.html#sec-enumerableownproperties" class="e-user-code">EnumerableOwnProperties</a></emu-xref>(<var>val</var>, <emu-const>key</emu-const>).</li><li>For each String <var>P</var> of <var>keys</var>, do<ol><li>Let <var>newElement</var> be ?&nbsp;<emu-xref aoid="InternalizeJSONProperty" id="_ref_15423"><a href="structured-data.html#sec-internalizejsonproperty" class="e-user-code">InternalizeJSONProperty</a></emu-xref>(<var>val</var>, <var>P</var>, <var>reviver</var>).</li><li>If <var>newElement</var> is <emu-val>undefined</emu-val>, then<ol><li>Perform ?&nbsp;<span class="e-user-code"><var>val</var>.<var class="field">[[Delete]]</var>(<var>P</var>)</span>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="CreateDataProperty" id="_ref_15424"><a href="abstract-operations.html#sec-createdataproperty" class="e-user-code">CreateDataProperty</a></emu-xref>(<var>val</var>, <var>P</var>, <var>newElement</var>).</li></ol></li></ol></li></ol></li></ol></li><li>Return ?&nbsp;<emu-xref aoid="Call" id="_ref_15425"><a href="abstract-operations.html#sec-call" class="e-user-code">Call</a></emu-xref>(<var>reviver</var>, <var>holder</var>, « <var>name</var>, <var>val</var>&nbsp;»).</li></ol></emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-json.stringify" type="built-in function">
<h1><span class="secnum">25.5.2</span> JSON.stringify ( <var>value</var> [ , <var>replacer</var> [ , <var>space</var> ] ] )</h1>
<p>This function returns a String in UTF-16 encoded JSON format representing an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15426"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, or <emu-val>undefined</emu-val>. It can take three parameters. The <var>value</var> parameter is an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15427"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, which is usually an object or array, although it can also be a String, Boolean, Number or <emu-val>null</emu-val>. The optional <var>replacer</var> parameter is either a function that alters the way objects and arrays are stringified, or an array of Strings and Numbers that acts as an inclusion list for selecting the object properties that will be stringified. The optional <var>space</var> parameter <emu-xref href="#sec-ecmascript-language-types-string-type" id="_ref_15428"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type">is a String</a></emu-xref> or Number that allows the result to have white space injected into it to improve human readability.</p>
<p>It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>stack</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15429"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>indent</var> be the empty String.</li><li>Let <var>PropertyList</var> be <emu-val>undefined</emu-val>.</li><li>Let <var>ReplacerFunction</var> be <emu-val>undefined</emu-val>.</li><li>If <var>replacer</var> <emu-xref href="#sec-object-type" id="_ref_15430"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref>, then<ol><li>If <emu-xref aoid="IsCallable" id="_ref_15431"><a href="abstract-operations.html#sec-iscallable">IsCallable</a></emu-xref>(<var>replacer</var>) is <emu-val>true</emu-val>, then<ol><li>Set <var>ReplacerFunction</var> to <var>replacer</var>.</li></ol></li><li>Else,<ol><li>Let <var>isArray</var> be ?&nbsp;<emu-xref aoid="IsArray" id="_ref_15432"><a href="abstract-operations.html#sec-isarray">IsArray</a></emu-xref>(<var>replacer</var>).</li><li>If <var>isArray</var> is <emu-val>true</emu-val>, then<ol><li>Set <var>PropertyList</var> to a new empty <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15433"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>len</var> be ?&nbsp;<emu-xref aoid="LengthOfArrayLike" id="_ref_15434"><a href="abstract-operations.html#sec-lengthofarraylike" class="e-user-code">LengthOfArrayLike</a></emu-xref>(<var>replacer</var>).</li><li>Let <var>k</var> be 0.</li><li>Repeat, while <var>k</var> &lt; <var>len</var>,<ol><li>Let <var>prop</var> be !&nbsp;<emu-xref aoid="ToString" id="_ref_15435"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<emu-xref aoid="𝔽" id="_ref_15436"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>k</var>)).</li><li>Let <var>v</var> be ?&nbsp;<emu-xref aoid="Get" id="_ref_15437"><a href="abstract-operations.html#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>replacer</var>, <var>prop</var>).</li><li>Let <var>item</var> be <emu-val>undefined</emu-val>.</li><li>If <var>v</var> <emu-xref href="#sec-ecmascript-language-types-string-type" id="_ref_15438"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type">is a String</a></emu-xref>, then<ol><li>Set <var>item</var> to <var>v</var>.</li></ol></li><li>Else if <var>v</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_15439"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, then<ol><li>Set <var>item</var> to !&nbsp;<emu-xref aoid="ToString" id="_ref_15440"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<var>v</var>).</li></ol></li><li>Else if <var>v</var> <emu-xref href="#sec-object-type" id="_ref_15441"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref>, then<ol><li>If <var>v</var> has a <var class="field">[[StringData]]</var> or <var class="field">[[NumberData]]</var> internal slot, set <var>item</var> to ?&nbsp;<emu-xref aoid="ToString" id="_ref_15442"><a href="abstract-operations.html#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>v</var>).</li></ol></li><li>If <var>item</var> is not <emu-val>undefined</emu-val> and <var>PropertyList</var> does not contain <var>item</var>, then<ol><li>Append <var>item</var> to <var>PropertyList</var>.</li></ol></li><li>Set <var>k</var> to <var>k</var> + 1.</li></ol></li></ol></li></ol></li></ol></li><li>If <var>space</var> <emu-xref href="#sec-object-type" id="_ref_15443"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref>, then<ol><li>If <var>space</var> has a <var class="field">[[NumberData]]</var> internal slot, then<ol><li>Set <var>space</var> to ?&nbsp;<emu-xref aoid="ToNumber" id="_ref_15444"><a href="abstract-operations.html#sec-tonumber" class="e-user-code">ToNumber</a></emu-xref>(<var>space</var>).</li></ol></li><li>Else if <var>space</var> has a <var class="field">[[StringData]]</var> internal slot, then<ol><li>Set <var>space</var> to ?&nbsp;<emu-xref aoid="ToString" id="_ref_15445"><a href="abstract-operations.html#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>space</var>).</li></ol></li></ol></li><li>If <var>space</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_15446"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, then<ol><li>Let <var>spaceMV</var> be !&nbsp;<emu-xref aoid="ToIntegerOrInfinity" id="_ref_15447"><a href="abstract-operations.html#sec-tointegerorinfinity">ToIntegerOrInfinity</a></emu-xref>(<var>space</var>).</li><li>Set <var>spaceMV</var> to <emu-xref aoid="min" id="_ref_15448"><a href="notational-conventions.html#eqn-min">min</a></emu-xref>(10, <var>spaceMV</var>).</li><li>If <var>spaceMV</var> &lt; 1, let <var>gap</var> be the empty String; else let <var>gap</var> be the String value containing <var>spaceMV</var> occurrences of the code unit 0x0020 (SPACE).</li></ol></li><li>Else if <var>space</var> <emu-xref href="#sec-ecmascript-language-types-string-type" id="_ref_15449"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type">is a String</a></emu-xref>, then<ol><li>If the length of <var>space</var> ≤ 10, let <var>gap</var> be <var>space</var>; else let <var>gap</var> be the <emu-xref href="#substring" id="_ref_15450"><a href="ecmascript-data-types-and-values.html#substring">substring</a></emu-xref> of <var>space</var> from 0 to 10.</li></ol></li><li>Else,<ol><li>Let <var>gap</var> be the empty String.</li></ol></li><li>Let <var>wrapper</var> be <emu-xref aoid="OrdinaryObjectCreate" id="_ref_15451"><a href="ordinary-and-exotic-objects-behaviours.html#sec-ordinaryobjectcreate">OrdinaryObjectCreate</a></emu-xref>(<emu-xref href="#sec-properties-of-the-object-prototype-object" id="_ref_15452"><a href="fundamental-objects.html#sec-properties-of-the-object-prototype-object">%Object.prototype%</a></emu-xref>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_15453"><a href="abstract-operations.html#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>wrapper</var>, the empty String, <var>value</var>).</li><li>Let <var>state</var> be the <emu-xref href="#sec-json-serialization-record" id="_ref_15454"><a href="structured-data.html#sec-json-serialization-record">JSON Serialization Record</a></emu-xref> { <var class="field">[[ReplacerFunction]]</var>: <var>ReplacerFunction</var>, <var class="field">[[Stack]]</var>: <var>stack</var>, <var class="field">[[Indent]]</var>: <var>indent</var>, <var class="field">[[Gap]]</var>: <var>gap</var>, <var class="field">[[PropertyList]]</var>: <var>PropertyList</var>&nbsp;}.</li><li>Return ?&nbsp;<emu-xref aoid="SerializeJSONProperty" id="_ref_15455"><a href="structured-data.html#sec-serializejsonproperty" class="e-user-code">SerializeJSONProperty</a></emu-xref>(<var>state</var>, the empty String, <var>wrapper</var>).</li></ol></emu-alg>
<p>The <emu-val>"length"</emu-val> property of this function is <emu-val>3</emu-val><sub>𝔽</sub>.</p>
<emu-note><span class="note">Note 1</span><div class="note-contents">
<p>JSON structures are allowed to be nested to any depth, but they must be acyclic. If <var>value</var> is or contains a cyclic structure, then this function must throw a <emu-val>TypeError</emu-val> exception. This is an example of a value that cannot be stringified:</p>
<pre><code class="javascript hljs">a = [];
a[<span class="hljs-number">0</span>] = a;
my_text = <span class="hljs-variable constant_">JSON</span>.<span class="hljs-title function_">stringify</span>(a); <span class="hljs-comment">// This must throw a TypeError.</span></code></pre>
</div></emu-note>
<emu-note><span class="note">Note 2</span><div class="note-contents">
<p>Symbolic primitive values are rendered as follows:</p>
<ul>
<li>
The <emu-val>null</emu-val> value is rendered in JSON text as the String value <emu-val>"null"</emu-val>.
</li>
<li>
The <emu-val>undefined</emu-val> value is not rendered.
</li>
<li>
The <emu-val>true</emu-val> value is rendered in JSON text as the String value <emu-val>"true"</emu-val>.
</li>
<li>
The <emu-val>false</emu-val> value is rendered in JSON text as the String value <emu-val>"false"</emu-val>.
</li>
</ul>
</div></emu-note>
<emu-note><span class="note">Note 3</span><div class="note-contents">
<p>String values are wrapped in QUOTATION MARK (<code>"</code>) code units. The code units <code>"</code> and <code>\</code> are escaped with <code>\</code> prefixes. Control characters code units are replaced with escape sequences <code>\u</code>HHHH, or with the shorter forms, <code>\b</code> (BACKSPACE), <code>\f</code> (FORM FEED), <code>\n</code> (LINE FEED), <code>\r</code> (CARRIAGE RETURN), <code>\t</code> (CHARACTER TABULATION).</p>
</div></emu-note>
<emu-note><span class="note">Note 4</span><div class="note-contents">
<p><emu-xref href="#finite" id="_ref_15456"><a href="ecmascript-data-types-and-values.html#finite">Finite</a></emu-xref> numbers are stringified as if by calling <emu-xref aoid="ToString" id="_ref_15457"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<var>number</var>). <emu-val>NaN</emu-val> and <emu-val>Infinity</emu-val> regardless of sign are represented as the String value <emu-val>"null"</emu-val>.</p>
</div></emu-note>
<emu-note><span class="note">Note 5</span><div class="note-contents">
<p>Values that do not have a JSON representation (such as <emu-val>undefined</emu-val> and functions) do not produce a String. Instead they produce the <emu-val>undefined</emu-val> value. In arrays these values are represented as the String value <emu-val>"null"</emu-val>. In objects an unrepresentable value causes the property to be excluded from stringification.</p>
</div></emu-note>
<emu-note><span class="note">Note 6</span><div class="note-contents">
<p>An object is rendered as U+007B (LEFT CURLY BRACKET) followed by zero or more properties, separated with a U+002C (COMMA), closed with a U+007D (RIGHT CURLY BRACKET). A property is a quoted String representing the <emu-xref href="#property-name" id="_ref_15458"><a href="ecmascript-data-types-and-values.html#property-name">property name</a></emu-xref>, a U+003A (COLON), and then the stringified property value. An array is rendered as an opening U+005B (LEFT SQUARE BRACKET) followed by zero or more values, separated with a U+002C (COMMA), closed with a U+005D (RIGHT SQUARE BRACKET).</p>
</div></emu-note>
<emu-clause id="sec-json-serialization-record">
<h1><span class="secnum">25.5.2.1</span> JSON Serialization Record</h1>
<p>A <dfn variants="JSON Serialization Records" tabindex="-1">JSON Serialization Record</dfn> is a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15459"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">Record</a></emu-xref> value used to enable serialization to the JSON format.</p>
<p>JSON Serialization Records have the fields listed in <emu-xref href="#table-json-serialization-record" id="_ref_813"><a href="structured-data.html#table-json-serialization-record">Table 75</a></emu-xref>.</p>
<emu-table id="table-json-serialization-record" caption="JSON Serialization Record Fields"><figure><figcaption>Table 75: <emu-xref href="#sec-json-serialization-record" id="_ref_15460"><a href="structured-data.html#sec-json-serialization-record">JSON Serialization Record</a></emu-xref> Fields</figcaption>
<table>
<thead>
<tr>
<th>Field Name</th>
<th>Value</th>
<th>Meaning</th>
</tr>
</thead>
<tbody><tr>
<td><var class="field">[[ReplacerFunction]]</var></td>
<td>a <emu-xref href="#function-object" id="_ref_15461"><a href="ecmascript-data-types-and-values.html#function-object">function object</a></emu-xref> or <emu-val>undefined</emu-val></td>
<td>A function that can supply replacement values for object properties (from JSON.stringify's <var>replacer</var> parameter).</td>
</tr>
<tr>
<td><var class="field">[[PropertyList]]</var></td>
<td>either a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15462"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of Strings or <emu-val>undefined</emu-val></td>
<td>The names of properties to include when serializing a non-array object (from JSON.stringify's <var>replacer</var> parameter).</td>
</tr>
<tr>
<td><var class="field">[[Gap]]</var></td>
<td>a String</td>
<td>The unit of indentation (from JSON.stringify's <var>space</var> parameter).</td>
</tr>
<tr>
<td><var class="field">[[Stack]]</var></td>
<td>a <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15463"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref> of Objects</td>
<td>The set of nested objects that are in the process of being serialized. Used to detect cyclic structures.</td>
</tr>
<tr>
<td><var class="field">[[Indent]]</var></td>
<td>a String</td>
<td>The current indentation.</td>
</tr>
</tbody></table>
</figure></emu-table>
</emu-clause>
<emu-clause id="sec-serializejsonproperty" type="abstract operation" aoid="SerializeJSONProperty">
<h1><span class="secnum">25.5.2.2</span> SerializeJSONProperty ( <var>state</var>, <var>key</var>, <var>holder</var> )</h1>
<p>The abstract operation SerializeJSONProperty takes arguments <var>state</var> (a <emu-xref href="#sec-json-serialization-record" id="_ref_15464"><a href="structured-data.html#sec-json-serialization-record">JSON Serialization Record</a></emu-xref>), <var>key</var> (a String), and <var>holder</var> (an Object) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15465"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either a String or <emu-val>undefined</emu-val>, or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15466"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>value</var> be ?&nbsp;<emu-xref aoid="Get" id="_ref_15467"><a href="abstract-operations.html#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>holder</var>, <var>key</var>).</li><li>If <var>value</var> <emu-xref href="#sec-object-type" id="_ref_15468"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref> or <var>value</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_15469"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref>, then<ol><li>Let <var>toJSON</var> be ?&nbsp;<emu-xref aoid="GetV" id="_ref_15470"><a href="abstract-operations.html#sec-getv" class="e-user-code">GetV</a></emu-xref>(<var>value</var>, <emu-val>"toJSON"</emu-val>).</li><li>If <emu-xref aoid="IsCallable" id="_ref_15471"><a href="abstract-operations.html#sec-iscallable">IsCallable</a></emu-xref>(<var>toJSON</var>) is <emu-val>true</emu-val>, then<ol><li>Set <var>value</var> to ?&nbsp;<emu-xref aoid="Call" id="_ref_15472"><a href="abstract-operations.html#sec-call" class="e-user-code">Call</a></emu-xref>(<var>toJSON</var>, <var>value</var>, « <var>key</var>&nbsp;»).</li></ol></li></ol></li><li>If <var>state</var>.<var class="field">[[ReplacerFunction]]</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>value</var> to ?&nbsp;<emu-xref aoid="Call" id="_ref_15473"><a href="abstract-operations.html#sec-call" class="e-user-code">Call</a></emu-xref>(<var>state</var>.<var class="field">[[ReplacerFunction]]</var>, <var>holder</var>, « <var>key</var>, <var>value</var>&nbsp;»).</li></ol></li><li>If <var>value</var> <emu-xref href="#sec-object-type" id="_ref_15474"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref>, then<ol><li>If <var>value</var> has a <var class="field">[[NumberData]]</var> internal slot, then<ol><li>Set <var>value</var> to ?&nbsp;<emu-xref aoid="ToNumber" id="_ref_15475"><a href="abstract-operations.html#sec-tonumber" class="e-user-code">ToNumber</a></emu-xref>(<var>value</var>).</li></ol></li><li>Else if <var>value</var> has a <var class="field">[[StringData]]</var> internal slot, then<ol><li>Set <var>value</var> to ?&nbsp;<emu-xref aoid="ToString" id="_ref_15476"><a href="abstract-operations.html#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>value</var>).</li></ol></li><li>Else if <var>value</var> has a <var class="field">[[BooleanData]]</var> internal slot, then<ol><li>Set <var>value</var> to <var>value</var>.<var class="field">[[BooleanData]]</var>.</li></ol></li><li>Else if <var>value</var> has a <var class="field">[[BigIntData]]</var> internal slot, then<ol><li>Set <var>value</var> to <var>value</var>.<var class="field">[[BigIntData]]</var>.</li></ol></li></ol></li><li>If <var>value</var> is <emu-val>null</emu-val>, return <emu-val>"null"</emu-val>.</li><li>If <var>value</var> is <emu-val>true</emu-val>, return <emu-val>"true"</emu-val>.</li><li>If <var>value</var> is <emu-val>false</emu-val>, return <emu-val>"false"</emu-val>.</li><li>If <var>value</var> <emu-xref href="#sec-ecmascript-language-types-string-type" id="_ref_15477"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type">is a String</a></emu-xref>, return <emu-xref aoid="QuoteJSONString" id="_ref_15478"><a href="structured-data.html#sec-quotejsonstring">QuoteJSONString</a></emu-xref>(<var>value</var>).</li><li>If <var>value</var> <emu-xref href="#sec-ecmascript-language-types-number-type" id="_ref_15479"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, then<ol><li>If <var>value</var> is <emu-xref href="#finite" id="_ref_15480"><a href="ecmascript-data-types-and-values.html#finite">finite</a></emu-xref>, return !&nbsp;<emu-xref aoid="ToString" id="_ref_15481"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<var>value</var>).</li><li>Return <emu-val>"null"</emu-val>.</li></ol></li><li>If <var>value</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type" id="_ref_15482"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>value</var> <emu-xref href="#sec-object-type" id="_ref_15483"><a href="ecmascript-data-types-and-values.html#sec-object-type">is an Object</a></emu-xref> and <emu-xref aoid="IsCallable" id="_ref_15484"><a href="abstract-operations.html#sec-iscallable">IsCallable</a></emu-xref>(<var>value</var>) is <emu-val>false</emu-val>, then<ol><li>Let <var>isArray</var> be ?&nbsp;<emu-xref aoid="IsArray" id="_ref_15485"><a href="abstract-operations.html#sec-isarray">IsArray</a></emu-xref>(<var>value</var>).</li><li>If <var>isArray</var> is <emu-val>true</emu-val>, return ?&nbsp;<emu-xref aoid="SerializeJSONArray" id="_ref_15486"><a href="structured-data.html#sec-serializejsonarray" class="e-user-code">SerializeJSONArray</a></emu-xref>(<var>state</var>, <var>value</var>).</li><li>Return ?&nbsp;<emu-xref aoid="SerializeJSONObject" id="_ref_15487"><a href="structured-data.html#sec-serializejsonobject" class="e-user-code">SerializeJSONObject</a></emu-xref>(<var>state</var>, <var>value</var>).</li></ol></li><li>Return <emu-val>undefined</emu-val>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-quotejsonstring" type="abstract operation" aoid="QuoteJSONString">
<h1><span class="secnum">25.5.2.3</span> QuoteJSONString ( <var>value</var> )</h1>
<p>The abstract operation QuoteJSONString takes argument <var>value</var> (a String) and returns a String. It wraps <var>value</var> in 0x0022 (QUOTATION MARK) code units and escapes certain other code units within it. This operation interprets <var>value</var> as a sequence of UTF-16 encoded code points, as described in <emu-xref href="#sec-ecmascript-language-types-string-type" id="_ref_814"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>product</var> be the String value consisting solely of the code unit 0x0022 (QUOTATION MARK).</li><li>For each code point <var>C</var> of <emu-xref aoid="StringToCodePoints" id="_ref_15488"><a href="ecmascript-language-source-code.html#sec-stringtocodepoints">StringToCodePoints</a></emu-xref>(<var>value</var>), do<ol><li>If <var>C</var> is listed in the “Code Point” column of <emu-xref href="#table-json-single-character-escapes" id="_ref_815"><a href="structured-data.html#table-json-single-character-escapes">Table 76</a></emu-xref>, then<ol><li>Set <var>product</var> to the <emu-xref href="#string-concatenation" id="_ref_15489"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>product</var> and the escape sequence for <var>C</var> as specified in the “Escape Sequence” column of the corresponding row.</li></ol></li><li>Else if <var>C</var> has a numeric value less than 0x0020 (SPACE) or <var>C</var> has the same numeric value as a <emu-xref href="#leading-surrogate" id="_ref_15490"><a href="ecmascript-data-types-and-values.html#leading-surrogate">leading surrogate</a></emu-xref> or <emu-xref href="#trailing-surrogate" id="_ref_15491"><a href="ecmascript-data-types-and-values.html#trailing-surrogate">trailing surrogate</a></emu-xref>, then<ol><li>Let <var>unit</var> be the code unit whose numeric value is the numeric value of <var>C</var>.</li><li>Set <var>product</var> to the <emu-xref href="#string-concatenation" id="_ref_15492"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>product</var> and <emu-xref aoid="UnicodeEscape" id="_ref_15493"><a href="structured-data.html#sec-unicodeescape">UnicodeEscape</a></emu-xref>(<var>unit</var>).</li></ol></li><li>Else,<ol><li>Set <var>product</var> to the <emu-xref href="#string-concatenation" id="_ref_15494"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>product</var> and <emu-xref aoid="UTF16EncodeCodePoint" id="_ref_15495"><a href="ecmascript-language-source-code.html#sec-utf16encodecodepoint">UTF16EncodeCodePoint</a></emu-xref>(<var>C</var>).</li></ol></li></ol></li><li>Set <var>product</var> to the <emu-xref href="#string-concatenation" id="_ref_15496"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>product</var> and the code unit 0x0022 (QUOTATION MARK).</li><li>Return <var>product</var>.</li></ol></emu-alg>
<emu-table id="table-json-single-character-escapes" caption="JSON Single Character Escape Sequences"><figure><figcaption>Table 76: JSON Single Character Escape Sequences</figcaption>
<table>
<thead>
<tr>
<th>
Code Point
</th>
<th>
Unicode Character Name
</th>
<th>
Escape Sequence
</th>
</tr>
</thead>
<tbody><tr>
<td>
U+0008
</td>
<td>
BACKSPACE
</td>
<td>
<code>\b</code>
</td>
</tr>
<tr>
<td>
U+0009
</td>
<td>
CHARACTER TABULATION
</td>
<td>
<code>\t</code>
</td>
</tr>
<tr>
<td>
U+000A
</td>
<td>
LINE FEED (LF)
</td>
<td>
<code>\n</code>
</td>
</tr>
<tr>
<td>
U+000C
</td>
<td>
FORM FEED (FF)
</td>
<td>
<code>\f</code>
</td>
</tr>
<tr>
<td>
U+000D
</td>
<td>
CARRIAGE RETURN (CR)
</td>
<td>
<code>\r</code>
</td>
</tr>
<tr>
<td>
U+0022
</td>
<td>
QUOTATION MARK
</td>
<td>
<code>\"</code>
</td>
</tr>
<tr>
<td>
U+005C
</td>
<td>
REVERSE SOLIDUS
</td>
<td>
<code>\\</code>
</td>
</tr>
</tbody></table>
</figure></emu-table>
</emu-clause>
<emu-clause id="sec-unicodeescape" type="abstract operation" aoid="UnicodeEscape">
<h1><span class="secnum">25.5.2.4</span> UnicodeEscape ( <var>C</var> )</h1>
<p>The abstract operation UnicodeEscape takes argument <var>C</var> (a code unit) and returns a String. It represents <var>C</var> as a Unicode escape sequence. It performs the following steps when called:</p>
<emu-alg><ol><li>Let <var>n</var> be the numeric value of <var>C</var>.</li><li><emu-xref href="#assert" id="_ref_15497"><a href="notational-conventions.html#assert">Assert</a></emu-xref>: <var>n</var> ≤ 0xFFFF.</li><li>Let <var>hex</var> be the String representation of <var>n</var>, formatted as a lowercase hexadecimal number.</li><li>Return the <emu-xref href="#string-concatenation" id="_ref_15498"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of the code unit 0x005C (REVERSE SOLIDUS), <emu-val>"u"</emu-val>, and <emu-xref aoid="StringPad" id="_ref_15499"><a href="text-processing.html#sec-stringpad">StringPad</a></emu-xref>(<var>hex</var>, 4, <emu-val>"0"</emu-val>, <emu-const>start</emu-const>).</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-serializejsonobject" type="abstract operation" aoid="SerializeJSONObject">
<h1><span class="secnum">25.5.2.5</span> SerializeJSONObject ( <var>state</var>, <var>value</var> )</h1>
<p>The abstract operation SerializeJSONObject takes arguments <var>state</var> (a <emu-xref href="#sec-json-serialization-record" id="_ref_15500"><a href="structured-data.html#sec-json-serialization-record">JSON Serialization Record</a></emu-xref>) and <var>value</var> (an Object) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15501"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a String or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15502"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It serializes an object. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>state</var>.<var class="field">[[Stack]]</var> contains <var>value</var>, throw a <emu-val>TypeError</emu-val> exception because the structure is cyclical.</li><li>Append <var>value</var> to <var>state</var>.<var class="field">[[Stack]]</var>.</li><li>Let <var>stepBack</var> be <var>state</var>.<var class="field">[[Indent]]</var>.</li><li>Set <var>state</var>.<var class="field">[[Indent]]</var> to the <emu-xref href="#string-concatenation" id="_ref_15503"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>state</var>.<var class="field">[[Indent]]</var> and <var>state</var>.<var class="field">[[Gap]]</var>.</li><li>If <var>state</var>.<var class="field">[[PropertyList]]</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>K</var> be <var>state</var>.<var class="field">[[PropertyList]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>K</var> be ?&nbsp;<emu-xref aoid="EnumerableOwnProperties" id="_ref_15504"><a href="abstract-operations.html#sec-enumerableownproperties" class="e-user-code">EnumerableOwnProperties</a></emu-xref>(<var>value</var>, <emu-const>key</emu-const>).</li></ol></li><li>Let <var>partial</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15505"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>For each element <var>P</var> of <var>K</var>, do<ol><li>Let <var>strP</var> be ?&nbsp;<emu-xref aoid="SerializeJSONProperty" id="_ref_15506"><a href="structured-data.html#sec-serializejsonproperty" class="e-user-code">SerializeJSONProperty</a></emu-xref>(<var>state</var>, <var>P</var>, <var>value</var>).</li><li>If <var>strP</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>member</var> be <emu-xref aoid="QuoteJSONString" id="_ref_15507"><a href="structured-data.html#sec-quotejsonstring">QuoteJSONString</a></emu-xref>(<var>P</var>).</li><li>Set <var>member</var> to the <emu-xref href="#string-concatenation" id="_ref_15508"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>member</var> and <emu-val>":"</emu-val>.</li><li>If <var>state</var>.<var class="field">[[Gap]]</var> is not the empty String, then<ol><li>Set <var>member</var> to the <emu-xref href="#string-concatenation" id="_ref_15509"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>member</var> and the code unit 0x0020 (SPACE).</li></ol></li><li>Set <var>member</var> to the <emu-xref href="#string-concatenation" id="_ref_15510"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>member</var> and <var>strP</var>.</li><li>Append <var>member</var> to <var>partial</var>.</li></ol></li></ol></li><li>If <var>partial</var> is empty, then<ol><li>Let <var>final</var> be <emu-val>"{}"</emu-val>.</li></ol></li><li>Else,<ol><li>If <var>state</var>.<var class="field">[[Gap]]</var> is the empty String, then<ol><li>Let <var>properties</var> be the String value formed by concatenating all the element Strings of <var>partial</var> with each adjacent pair of Strings separated with the code unit 0x002C (COMMA). A comma is not inserted either before the first String or after the last String.</li><li>Let <var>final</var> be the <emu-xref href="#string-concatenation" id="_ref_15511"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <emu-val>"{"</emu-val>, <var>properties</var>, and <emu-val>"}"</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>separator</var> be the <emu-xref href="#string-concatenation" id="_ref_15512"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of the code unit 0x002C (COMMA), the code unit 0x000A (LINE FEED), and <var>state</var>.<var class="field">[[Indent]]</var>.</li><li>Let <var>properties</var> be the String value formed by concatenating all the element Strings of <var>partial</var> with each adjacent pair of Strings separated with <var>separator</var>. The <var>separator</var> String is not inserted either before the first String or after the last String.</li><li>Let <var>final</var> be the <emu-xref href="#string-concatenation" id="_ref_15513"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <emu-val>"{"</emu-val>, the code unit 0x000A (LINE FEED), <var>state</var>.<var class="field">[[Indent]]</var>, <var>properties</var>, the code unit 0x000A (LINE FEED), <var>stepBack</var>, and <emu-val>"}"</emu-val>.</li></ol></li></ol></li><li>Remove the last element of <var>state</var>.<var class="field">[[Stack]]</var>.</li><li>Set <var>state</var>.<var class="field">[[Indent]]</var> to <var>stepBack</var>.</li><li>Return <var>final</var>.</li></ol></emu-alg>
</emu-clause>
<emu-clause id="sec-serializejsonarray" type="abstract operation" aoid="SerializeJSONArray">
<h1><span class="secnum">25.5.2.6</span> SerializeJSONArray ( <var>state</var>, <var>value</var> )</h1>
<p>The abstract operation SerializeJSONArray takes arguments <var>state</var> (a <emu-xref href="#sec-json-serialization-record" id="_ref_15514"><a href="structured-data.html#sec-json-serialization-record">JSON Serialization Record</a></emu-xref>) and <var>value</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_15515"><a href="ecmascript-data-types-and-values.html#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15516"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a String or a <emu-xref href="#sec-completion-record-specification-type" id="_ref_15517"><a href="ecmascript-data-types-and-values.html#sec-completion-record-specification-type">throw completion</a></emu-xref>. It serializes an array. It performs the following steps when called:</p>
<emu-alg><ol><li>If <var>state</var>.<var class="field">[[Stack]]</var> contains <var>value</var>, throw a <emu-val>TypeError</emu-val> exception because the structure is cyclical.</li><li>Append <var>value</var> to <var>state</var>.<var class="field">[[Stack]]</var>.</li><li>Let <var>stepBack</var> be <var>state</var>.<var class="field">[[Indent]]</var>.</li><li>Set <var>state</var>.<var class="field">[[Indent]]</var> to the <emu-xref href="#string-concatenation" id="_ref_15518"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <var>state</var>.<var class="field">[[Indent]]</var> and <var>state</var>.<var class="field">[[Gap]]</var>.</li><li>Let <var>partial</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type" id="_ref_15519"><a href="ecmascript-data-types-and-values.html#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>len</var> be ?&nbsp;<emu-xref aoid="LengthOfArrayLike" id="_ref_15520"><a href="abstract-operations.html#sec-lengthofarraylike" class="e-user-code">LengthOfArrayLike</a></emu-xref>(<var>value</var>).</li><li>Let <var>index</var> be 0.</li><li>Repeat, while <var>index</var> &lt; <var>len</var>,<ol><li>Let <var>strP</var> be ?&nbsp;<emu-xref aoid="SerializeJSONProperty" id="_ref_15521"><a href="structured-data.html#sec-serializejsonproperty" class="e-user-code">SerializeJSONProperty</a></emu-xref>(<var>state</var>, !&nbsp;<emu-xref aoid="ToString" id="_ref_15522"><a href="abstract-operations.html#sec-tostring">ToString</a></emu-xref>(<emu-xref aoid="𝔽" id="_ref_15523"><a href="notational-conventions.html#%F0%9D%94%BD">𝔽</a></emu-xref>(<var>index</var>)), <var>value</var>).</li><li>If <var>strP</var> is <emu-val>undefined</emu-val>, then<ol><li>Append <emu-val>"null"</emu-val> to <var>partial</var>.</li></ol></li><li>Else,<ol><li>Append <var>strP</var> to <var>partial</var>.</li></ol></li><li>Set <var>index</var> to <var>index</var> + 1.</li></ol></li><li>If <var>partial</var> is empty, then<ol><li>Let <var>final</var> be <emu-val>"[]"</emu-val>.</li></ol></li><li>Else,<ol><li>If <var>state</var>.<var class="field">[[Gap]]</var> is the empty String, then<ol><li>Let <var>properties</var> be the String value formed by concatenating all the element Strings of <var>partial</var> with each adjacent pair of Strings separated with the code unit 0x002C (COMMA). A comma is not inserted either before the first String or after the last String.</li><li>Let <var>final</var> be the <emu-xref href="#string-concatenation" id="_ref_15524"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <emu-val>"["</emu-val>, <var>properties</var>, and <emu-val>"]"</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>separator</var> be the <emu-xref href="#string-concatenation" id="_ref_15525"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of the code unit 0x002C (COMMA), the code unit 0x000A (LINE FEED), and <var>state</var>.<var class="field">[[Indent]]</var>.</li><li>Let <var>properties</var> be the String value formed by concatenating all the element Strings of <var>partial</var> with each adjacent pair of Strings separated with <var>separator</var>. The <var>separator</var> String is not inserted either before the first String or after the last String.</li><li>Let <var>final</var> be the <emu-xref href="#string-concatenation" id="_ref_15526"><a href="ecmascript-data-types-and-values.html#string-concatenation">string-concatenation</a></emu-xref> of <emu-val>"["</emu-val>, the code unit 0x000A (LINE FEED), <var>state</var>.<var class="field">[[Indent]]</var>, <var>properties</var>, the code unit 0x000A (LINE FEED), <var>stepBack</var>, and <emu-val>"]"</emu-val>.</li></ol></li></ol></li><li>Remove the last element of <var>state</var>.<var class="field">[[Stack]]</var>.</li><li>Set <var>state</var>.<var class="field">[[Indent]]</var> to <var>stepBack</var>.</li><li>Return <var>final</var>.</li></ol></emu-alg>
<emu-note><span class="note">Note</span><div class="note-contents">
<p>The representation of arrays includes only the elements in the <emu-xref href="#interval" id="_ref_15527"><a href="notational-conventions.html#interval">interval</a></emu-xref> from <emu-val>+0</emu-val><sub>𝔽</sub> (inclusive) to <code>array.length</code> (exclusive). Properties whose keys are not <emu-xref href="#array-index" id="_ref_15528"><a href="ecmascript-data-types-and-values.html#array-index">array indices</a></emu-xref> are excluded from the stringification. An array is stringified as an opening LEFT SQUARE BRACKET, elements separated by COMMA, and a closing RIGHT SQUARE BRACKET.</p>
</div></emu-note>
</emu-clause>
</emu-clause>
<emu-clause oldids="sec-json-@@tostringtag" id="sec-json-%symbol.tostringtag%"><span id="sec-json-@@tostringtag"></span>
<h1><span class="secnum">25.5.3</span> JSON [ %Symbol.toStringTag% ]</h1>
<p>The initial value of the <emu-xref href="#sec-well-known-symbols" id="_ref_15529"><a href="ecmascript-data-types-and-values.html#sec-well-known-symbols">%Symbol.toStringTag%</a></emu-xref> property is the String value <emu-val>"JSON"</emu-val>.</p>
<p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>true</emu-val> }.</p>
</emu-clause>
</emu-clause>
</emu-clause></div></body>
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