Better Javascript: The Module Pattern

Posted by on July 18, 2015

The Module Pattern was originally defined as a way to have software modules in a programming language with incomplete direct support for the concept.

This pattern in JavaScript is used to mimic the classes concept and focuses on public and private encapsulation in such a way that we’re able to include both public/private methods and variables inside a single object.

The Module Pattern is, the most commonly used design pattern and widely accepted, you can find it in a number of large projects such as jQuery, Dojo, ExtJS, AngularJS and YUI.

To implement this pattern we will use another one know as the Immediately-invoked function expression

What? Well, this one:

(function () {
  // the code here is executed once in its own scope

It declares a function, which then calls itself immediately.

So, lets watch a sample of the Module pattern:

var MyFancyModule = (function () {

  var privateMethodOne 		= function () {};
  var privateMethodTwo 		= function () {};
  var privateMethodThree 	= function () {};
  return {
    publicMethodOne: function () {
      // You can call `privateMethodX()` you know...
    publicMethodtwo: function () {

    publicMethodThree: function () {



Now you can get an idea on how to organize your shitty code.