This pattern is used to mimic classes in conventional software engineering and focuses on public and private access to methods & variables. The module pattern strives to improve the reduction of globally scoped variables, thus decreasing the chances of collision with other code throughout an application.

JSModulePattern1.js

( function( window, undefined ) {

// normally variables & functions start with a lowercase letter but with modules, that is not the case.
// The general tradition is to start them with a capital letter instead.
function MyModule() {

// `this` refers to the instance of `MyModule` when created
this.myMethod = function myMethod() {
alert( 'my method' );
};

// note that we still use a function declaration even when using a function expression.
// for more information on why, check out: http://kangax.github.io/nfe/
this.myOtherMethod = function myOtherMethod() {
alert( 'my other method' );
};

}

// expose access to the constructor
window.MyModule = MyModule;

} )( window );

// example usage
var myModule = new MyModule();
myModule.myMethod(); // alerts "my method"
myModule.myOtherMethod(); // alerts "my other method"