Skip to content

Instantly share code, notes, and snippets.

@techsin
Last active February 27, 2021 17:57
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save techsin/bfd32b73dcf2019ac59cda42b41e5039 to your computer and use it in GitHub Desktop.
Save techsin/bfd32b73dcf2019ac59cda42b41e5039 to your computer and use it in GitHub Desktop.
scope closure
a = ['a','b', 'c']
for (let i = 0; i < 3; i++) {
var c = a[i];
setTimeout(()=> console.log(c)); // c c c
}
//is same as, var is function scoped
var c;
a = ['a','b', 'c']
for (let i = 0; i < 3; i++) {
c = a[i];
setTimeout(()=> console.log(c)); // c c c
}
//let is block scoped
a = ['a','b', 'c']
for (let i = 0; i < 3; i++) {
let c = a[i];
setTimeout(()=> console.log(c)); // a b c
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment