IIFE - modular pattern in JS

iife.js

// from http://appendto.com/2010/10/how-good-c-habits-can-encourage-bad-javascript-habits-part-1/

(function(foo, $, undefined){ // parameters
  // private var in closure
  var data = [1, 2, 3];
  // public fn
  foo.moo = function() {
    console.log(data);
  }
  return foo;
})(window.foo = window.foo || {}, jQuery); // args

// calls itself immediately
// uses args from global scope
// refers to named parameters
// use $ and be sure it's jQuery
// undefined is used as 3rd param to assure it's not rewritten by other code in global scope. This sets undefineds value to undefined as it lacks an corresponding arg.

// *******
// PATTERNS
// *******

// 1. simple iife
// - all private
// 2. revealing module pattern
// - assign a return to a var
// - ok to set more public methods later
// 3. iife public and private
// - set props on object passed in
// - ok to set more public methods later