JavaScript module pattern / organization / sub-modules

Question

1. I would like to know what's the difference (advantages/disadvantages) between the following patterns.
2. How can I create sub modules based on the module pattern?

My goal is to have my js organized into multiple files that are lazy loaded but have one namespace.

For example:

SO.global (global.js) SO.global.registration (registration.js) <- load

var SO = function(){

    var CONSTANT = 'Z';

    function createX(){
      alert("create X");
    }

    function getY(){
       alert("get Y");
    }
    return{
      create:createX,
      get:getY
    }
}();

//SO.createX(); 
//SO.getY();

VS.

var SO = (function() {

    var CONSTANT = 'Z';

    function createX(){
      alert("create X");
    }

    function getY(){
       alert("get Y");
    }

    return {
      create:createX,
      get:getY
    }

} ());

Answer 1

Have you considered Require.JS? It attempts to provide the following solution:

• Some sort of #include/import/require
• ability to load nested dependencies
• ease of use for developer but then backed by an optimization tool that helps deployment

Require.JS implements the Module/Asynchronous Definition spec defined by Common.JS