An example complete of module pattern in javascript. From: http://briancray.com/posts/javascript-module-pattern

fiddle.html

<h1 id="qunit-header">Unit Tests</h1>
<h2 id="qunit-banner"></h2>
<div id="qunit-testrunner-toolbar"></div>
<ol id="qunit-tests"></ol>
<div id="qunit-fixture"></div>​

fiddle.js

var Person = (function () {
  var foo = 'bar';
  
  var firstName;
  var lastName;
  
  var Person =  function(first, last){
    firstName = first;
    lastName = last;
  };
  
  Person.prototype = {
    constructor: Person,
    name: function(){
      return lastName + ", " + firstName;
    },
    firstName: function() { return firstName },
    lastName: function() { return lastName }
  };
  
  return Person;
})();

var john = new Person('John', 'Doe');

test("the function name() must be public (accessible from outside)", function() {
    equal(john.name(), 'Doe, John');
});

test("the attribute foo must be private", function(){
  equal(john.hasOwnProperty('foo'), false);
});

test("the attribute firstName must be private", function(){
  equal(john.hasOwnProperty('firstName'), false);
});

test("the function firstName must be public", function(){
  equal(john.firstName(), 'John');
});

fiddle.manifest

name: Module pattern complete
description: http://briancray.com/posts/javascript-module-pattern
authors:
  - Maxi Dello Russo
resources:
  - http://code.jquery.com/qunit/qunit-1.10.0.js
  - http://code.jquery.com/qunit/qunit-1.10.0.css
normalize_css: no