Sandbox pattern.

main.js

    function Sandbox() {

        // turning arguments into an array
        var args = Array.prototype.slice.call(arguments),
            // last argument is the callback
            callback = args.pop(),
            // modules can be passed as an array or as individual parameters
            modules = (args[0] && typeof args[0] === "string") ? args : args[0],
            i;

        // Making the call as a constructor
        if (!(this instanceof Sandbox)) {
            return new Sandbox(modules, callback);
        }

        // Add properties to this
        this.a = 1;
        this.b = 2;

        // add modules to the core 'this' object
        // no modules or '*' both mean 'use all modules'
        if (!modules || modules === '*') {
            modules = [];
            for (i in Sandbox.modules) {
                if (Sandbox.modules.hasOwnProperty(i)) {
                    modules.push(i);
                }
            }
        }

        // init the required modules
        for (i = 0; i < modules.length; i += 1) {
            Sandbox.modules[modules[i]](this);
        }

        // callback
        callback(this);

        // prototype properties
        Sandbox.prototype = {
            name: 'APP',
            getName: function () {
                return this.name;
            }
        }
    }