Modules loader - Simple implementation

app.js

(function(window, document, undefined) {

    var cheermeup = window.modules.require('salute');
    // ... 
    cheermeup.sayHi("Ale");

})(window, document);

Require.js

// Require.js

(function(window, document, undefined) {

    var Require = function() {

        var modules = {};

        function require(name) {
            var Module = modules[name];
            return Module();
        }

        function define(name, module) {
            modules[name] = module;
        }

        return {
            require: require,
            define: define
        };

    };

    window.modules = Require();

})(window, document);

SomeModule.js

(function(window, document, undefined) {

    var Module = function() {

        function sayHi(name) {
            var name = name || "";
            console.log("Hi " + name);
        }

        return {
            sayHi: sayHi
        };

    };

    window.modules.define('salute', Module);

})(window, document);