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Returning functions

Functions are objects, so they can be passed around like callbacks for example and also returned by other functions.

You call a function that does some complicated setup and as a results returns a new function. You assign the result to a new function and use it afterwards.

function setup() {
    return function() {
var my = setup(); // alerts 1
my(); // alerts 2

Your setup function can store some private data in a closure and use that data somehow.

Here setup() creates a counter function, which gives a next ID for example. But the count variable is not exposed.

function setup() {
    var count = 0;
    return function() {
        return ++count;
var next = setup();
next(); // 1
next(); // 2


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