Closure in Javascript

• A Closure is nothing but a function inside another function.
• This closure function can access the variables inside its own scope, the outer function's variables and the global variables.

Example

In this example, whenever we call the myClosure function the value of i will be increased by one. i will be set to zero only once and only the inner function will be called everytime when myClosure is called

var myClosure = (function () {
    var i = 0;
    return function () {return i += 1;}
})();
myClosure();//i=1
myClosure();//i=2
myClosure();//i=3