Advance Javascript - Closure

Closure is function in inner a function.

>> function addTwoNumber(n){

>>    function add(m){

>>       return n+m;

>>    }

>>    return add;

>> }

And you use like this one:

>> var useN = addTwoNumber(2);

if you display the variable useN, you will get

>> function add(m) { return n+m; }

So you need accessing above inner function by using bracket:

>> var useN = addTwoNumber(2)(3);

or 

>> var useN = addTwoNumber(2);

>> useN(3);

The above will result in "5".

Advance Javascript - Closure