javascriptModule

// constructor function
function Foo(){

  //public
  this.name = "Bob";

  // private
  var self = this,	// <-- assign 'this' within constructor to private variable to allow private methods access to the object members
  		x = 6;  

  // private function; can access private variables and functions, use private 'this' alias (self) to access public members
  function privateHello(){
      console.log("I am a private function");
      return self.name;  // Bob
  }

  // privileged; is public but can access private members and be accessed by public members
  this.publicHello = function(){
  	console.log("I am a public function");
    return privateHello();
  }
}

// public function
// does not have access to private or public members
Foo.prototype.bar = function(){
  return "bar";
};

// ALTERNATIVE PROTOTYPE PATTERN

// Foo.prototype = {
//   bar: function(){
//     console.log("bar");
//   }
// };

var foo = new Foo();
console.log("foo.name: " + foo.name); // Bob
console.log("foo.x: " + foo.x); // undefined
console.log("foo.self: " + foo.self); // undefined
console.log("foo.bar: " + foo.bar()); // bar
console.log("foo.publicHello(): " + foo.publicHello()); // Bob
console.log("foo.privateHello(): " + foo.privateHello());	// TypeError

// based on information from http://javascript.crockford.com/private.html