Where JS stores variables declared by `let` and `const`?

Asked Apr 16 '18 at 23:13

Active Apr 17 '18 at 01:26

Viewed 195 times

An interesting question pop into my head and I couldn't find an answer, so I tried to ask you guys, to hear your thoughts about it!

Global variables that declared by var keyword stored as properties to the window object.

Example

var foo = "foobar";
window.foo === foo;

This code would return true because the foo Global Variable has become a property to the window object.

Well, the interesting part here is that:

let foo = "foobar"; // Or `const` it doesn't matter
window.foo === foo;

That code above would return false.

I wonder; Where JavaScript store the Global Variables that declared by let and const?

edited Apr 17 '18 at 01:26

asked Apr 16 '18 at 23:13

Elharony

3

In the VM memory. Btw, try to run your code with a variable named not `name` but something else, eg `foo`. – zerkms Apr 16 '18 at 23:14
2

let and const are used within execution scope not global – Harry Apr 16 '18 at 23:16
Thanks, @zerkms for your comment. I edited the code as you requested. – Elharony Apr 17 '18 at 01:25