How variable can be accessible outside the for loop

Question

In the code below, I have declared variable i on for loop , and trying to access variable i and I can get the last updated value of i, how.

for(var i = 0; i <= 10; i++){
   console.log(i);
}

console.log(i,'outside');

Your code as posted works. What is it that you're *really* doing? — Pointy, Oct 09 '18 at 12:31
@ Pointy yes it works ,but I was trying to understand how that variable i posses that value outside the loop. — Vishal Pachpande, Oct 09 '18 at 12:47
`var` declarations create variables that are visible throughout the function they appear in. — Pointy, Oct 09 '18 at 12:50
Check this [link](https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var-to-declare-a-variable-in-jav) — Benyamin Jafari, Oct 09 '18 at 18:07

score 8 · Answer 1 · answered Oct 09 '18 at 12:32

The var statement declares a variable in the scope of the current function, not the current block (which is what the let statement is for).

After the for loop, you are still in the same function, so the variable still exists (with whatever value it was last set to).

(NB: For the purposes of var, the code which runs outside of any function is effectively treated as being in a function of its own).

score 2 · Answer 2 · edited Oct 09 '18 at 13:11

Well, you are using var, and that's exactly a var type should do!

We have var and let, let's see how they work.

when you declare your variable like this :

let something;

You only access something in that very scope (for example your own for loop), and outside the scope, you cannot have it. On the other hand, when you are using var type, like this :

var something;

You are able to use this variable outside the scope ( again like your own for loop )

Notice that we are not talking about global variables. we are just talking about scopes.

If you rather declare a global variable, just use var in the global scope.

How variable can be accessible outside the for loop

2 Answers2