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update post: Closure and this - How are variables resolved within functions?

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bendtherules
2020-08-03 04:30:13 +05:30
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@@ -176,7 +176,8 @@ It will finally reach global scope, which always provides a `this` value (global
### What does this explain? ### What does this explain?
1. Arrow functions don't have their own `this` value. It is taken from the closest `this`-providing scope. A. Arrow functions don't have their own `this` value. It is taken from the closest `this`-providing scope.
```js ```js
function outer() { function outer() {
const inner = () => { const inner = () => {
@@ -192,7 +193,8 @@ outer.call(obj);
``` ```
Same logic also applies for nested arrow functions. Same logic also applies for nested arrow functions.
2. Block scopes also don't have their own `this` value. B. Block scopes also don't have their own `this` value.
```js ```js
{ {
// just prints global object // just prints global object
@@ -200,7 +202,8 @@ Same logic also applies for nested arrow functions.
} }
``` ```
3. In modules, top-level `this` is `undefined`. C. In modules, top-level `this` is `undefined`.
```js ```js
// Save as file.mjs and run in node. // Save as file.mjs and run in node.
// That will run it as a module. // That will run it as a module.