JavaScript IoC

gistfile1.js

var define = function define(name, dependencies, moduleFactory) {
    window.modules = window.modules || {};
    window.modules[name] = {
        'moduleFactory': moduleFactory || dependencies,
        'dependencies': typeof(moduleFactory) == 'undefined' ? [] : dependencies
    };    
};

var require = function require(name) {
    var module = window.modules[name],
          deps = [];
    for (var i = 0; i < module.dependencies.length; i++) {
        deps.push(require(module.dependencies[i]));
    }
    
    return module.moduleFactory.apply(this, deps);
};

// define a module 'B' that depends on module 'A'
define('b', ['a'], function (a) {
    return {
        report: function () {
            a.report();
            console.log('B');
        }
    };
});

// define a module 'A'
define('a', function () {
    return {
        report: function () {console.log('A');}
    };
});  

var a = require('a');
a.report(); // "A"

var b = require('b');
b.report(); // "AB"