Let in Global Scope

JavaScript
1

Can someone please explain where the let variables are get declared in global scope. Variables declared with var key word are stored as properties of window object and can be accessed with this key word. Why let variables behave differently.

let_jargon
let_jargon445×679 26.2 KB
;

var myAge = 36;

function printMyAge () {
	var myAge = 32;
	console.log (myAge);
	console.log(this.myAge)
};

/*
printMyAge(); //Will return
32
36
*/

let myAge_1 = 36;

const printMyAge_1 = () => {
	let myAge_1 = 32;
	console.log (myAge_1);
	console.log(this.myAge_1);
};

/*
printMyAge_1(); //Will print
32
undefined
*/

window.myAge
// returns - 36
window.myAge_1
// returns - undefined

Any help kind explanation would be greatly appreciated.

Thanks in advance

2

It is simply a feature, variables declared with let are not added to the window object

Maybe take a look at this:

1 Like
3

Many thanks @ILM