w3schools closures code example

Example 1: closures in javascript

function OuterFunction() {

    var outerVariable = 100;

    function InnerFunction() {
        alert(outerVariable);
    }

    return InnerFunction;
}
var innerFunc = OuterFunction();

innerFunc(); // 100

Example 2: closure in javascript

A closure is a function bundeled together with its lexical scope