dependency injection

di.js

/**
 * simple dependency injection
 *
 * @copyright  Copyright (c) Tobias Zeising (http://www.aditu.de)
 * @license    GPLv3 (http://www.gnu.org/licenses/gpl-3.0.html)
 */
var injectCallable = {};
var injectObjects = {};

var define = function(name, obj) {
    injectCallable[name] = obj;
};

var injectPlaceholder = function(name) {
    this.name = name;
    this.injectPlaceholder = true;
};

var injected = function(name) {
    return new injectPlaceholder(name);
};

var inject = function(name) {
    if (typeof injectCallable[name] == 'undefined')
        throw name + " was not found";
    if (typeof injectObjects[name] == 'undefined') {
        injectObjects[name] = new injectCallable[name]();
        for (property in injectObjects[name]) {
            if (typeof injectObjects[name][property].injectPlaceholder != 'undefined')
                injectObjects[name][property] = inject(injectObjects[name][property].name);
        }
    }

    return injectObjects[name];
};

Simple dependency injection. Example:

define('oneclass', function() {
    this.foo = 'bar';
});

define('anotherclass', function() {
    this.oneclass = injected('oneclass');
});

var anotherclass = inject('anotherclass');
console.info(anotherclass.oneclass.foo); // 'bar'