Module Pattern Definition

gistfile1.js

var APP = (function() {

  // private members
  var foo = true;
  var bar = false;
  
  // private method
  function baz() {
    return 1;
  }
  
  // public api
  return {
    fooBar : function() {
      return 0;
    }
  }
}());

APP.foo; // will output undefined
APP.baz(); // will throw an Uncaught TypeError
APP.fooBar; // will outout 0