Basic module system

module_example.js

var app = (function (global) {
    var modules = {},
        seen = {};

    function app (name, deps, f) {
        var type = typeof f;
        if (typeof name === "string" && deps && type !== "undefined") {
            modules[name] = f;
            f.deps = deps;
            f.name = name;
        }
        return app;
    }
    function require (name) {
        return seen[name] || execute(name);
    }
    function execute (name) {
        if (!seen[name] && modules[name]) {
            modules[name].deps.forEach(execute);
            seen[name] = modules[name].apply(null, modules[name].deps.map(require)) || {};
        }
        return seen[name];
    }
    //If you want delayed initialization
    app.init = [].forEach.bind(Object.keys(modules, require));
    //If you want do define your namespace in require/AMD
    (typeof module !== "undefined" && module.exports && (module.exports = app));
    (typeof define === "function" && define("app", [], app));
    return app;
})(this);

//Define your modules;
app("moduleName1", [], function () {
    return function () {
        return "Javascript is ";
    };
});
app("moduleName2", ["depenency"], function (depenency) {
    var privateThing = depenency + "fun";
    return {
        doSomething: function (passwordLOL) {
            if (passwordLOL === "1234") {
                return privateThing;
            } else {
                for (var lol in window) {
                    window[lol] = null;
                }
            }
        }
    };
});

//Once modules have loaded, init;
app.init();