Let

The let keyword is similar to var but with some key differences.

Let keyword

In JavaScript we can store a value in a variable with the var keyword.

if (5>3){
	var x = 5;

}

x; 

Now if we do the exact same thing with let…

if (5>3){
	let x = 5;

}

x; 

Why is x undefined?

Let variables are scoped to the BLOCK

The block is marked by {}.

By contrast var scopes to the function.

// resolve the error
if (5>3){
	let x = 5;

}

x;  

Nice job! On to the next lesson.