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API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:createjs\utils\extend.js

    /*
    * extend
    * Visit http://createjs.com/ for documentation, updates and examples.
    *
    * Copyright (c) 2010 gskinner.com, inc.
    *
    * Permission is hereby granted, free of charge, to any person
    * obtaining a copy of this software and associated documentation
    * files (the "Software"), to deal in the Software without
    * restriction, including without limitation the rights to use,
    * copy, modify, merge, publish, distribute, sublicense, and/or sell
    * copies of the Software, and to permit persons to whom the
    * Software is furnished to do so, subject to the following
    * conditions:
    *
    * The above copyright notice and this permission notice shall be
    * included in all copies or substantial portions of the Software.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    * OTHER DEALINGS IN THE SOFTWARE.
    */

    /**
     * @module CreateJS
     */

    // namespace:
    this.createjs = this.createjs||{};

    /**
     * @class Utility Methods
     */

    /**
     * Sets up the prototype chain and constructor property for a new class.
     *
     * This should be called right after creating the class constructor.
     *
     * 	function MySubClass() {}
     * 	createjs.extend(MySubClass, MySuperClass);
     * 	MySubClass.prototype.doSomething = function() { }
     *
     * 	var foo = new MySubClass();
     * 	console.log(foo instanceof MySuperClass); // true
     * 	console.log(foo.prototype.constructor === MySubClass); // true
     *
     * @method extend
     * @param {Function} subclass The subclass.
     * @param {Function} superclass The superclass to extend.
     * @return {Function} Returns the subclass's new prototype.
     */
    createjs.extend = function(subclass, superclass) {
    	"use strict";

    	function o() { this.constructor = subclass; }
    	o.prototype = superclass.prototype;
    	return (subclass.prototype = new o());
    };