JavaScript module pattern (one of the flavors)

module.js

var module = (function () {
    // private variables and functions
    var foo = 'bar';

    // constructor
    var module = function () {
    };

    // prototype
    module.prototype = {
        constructor: module,
        something: function () {
        }
    };

    // return module
    return module;
})();

var my_module = new module();


// Pass global variables 

var module = (function (window, document, $) {
    // module stuff
})(window, document, jQuery);

// extend it with something_else();
var module = (function (module) {
    module.prototype.something_else = function () {
    };
    return module;
})(module);

//Inject it on demand

function inject_module (module_file) {
    var h = document.getElementsByTagName('head')[0];
    var s = document.createElement('script');
    s.type = 'text/javascript';
    s.src = module_file;
    h.appendChild(s);
};

/*Tips for well-designed modules

-Don't make modules explicitly depend on each other. Everything each module needs to work should be confined into either the module or plugins that are shared among modules.

-Have modules communicate to each other through event subscriptions, not through direct calls to each other. They call this a pubsub. If you’re using jQuery, check out jQuery Tiny Pub/Sub. If not, here’s a good vanilla pubsub.

-Create a light integration layer that handles module injection and interaction.

From "http://briancray.com/posts/javascript-module-pattern. */