bendtherules/blog-hashnode-backup
1
0
Fork 0
mirror of https://github.com/bendtherules/blog-hashnode-backup.git synced 2026-08-18 13:42:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
bendtherules
2020-08-03 09:15:19 +05:30
parent c9cd6e5f98
commit e7f4fd5e5f
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ckddoqwv80154xvs198jkaa5m.md
+4 -4
View File
@@ -106,11 +106,11 @@ function outer() {
### Variable lookup
Now, when we use something like `console.log(myText)` in the function body - it needs to resolve the value of the variable `myText`.
Now, when we use something like `console.log(myText)` in the function body - it needs to resolve or lookup the variable `myText`.
For variable lookup,
a. it will check in the current LexicalEnvironment (i.e. the new local scope) first, and
b. if it doesn't find the variable there, it will check in it's parent scope (parent of LE = F.[[Environment]] = lexical/closure scope),
For variable lookup,
a. it will check in the current LexicalEnvironment (i.e. the new local scope) first, and.
b. if it doesn't find the variable there, it will check in it's parent scope (parent of LE = F.[[Environment]] = lexical/closure scope),
c. and so on.
This lookup will finally end when it reaches the global scope (doesn't have parent scope). If the variable is still not found, it will throw a `ReferenceError`.