node-easel/src/createjs/utils/IndexOf.js

node wrapper for EaselJS, utilizing node-canvas.

/*
* IndexOf
* 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
 */
(function() {
	"use strict";

	/*
	 * Employs Duff's Device to make a more performant implementation of indexOf.
	 * see http://jsperf.com/duffs-indexof/2
	 * #method indexOf
	 * @param {Array} array Array to search for searchElement
	 * @param searchElement Element to search array for.
	 * @return {Number} The position of the first occurrence of a specified value searchElement in the passed in array ar.
	 * @constructor
	 */
	/* replaced with simple for loop for now, perhaps will be researched further
	createjs.indexOf = function (ar, searchElement) {
		var l = ar.length;

		var n = (l * 0.125) ^ 0;	// 0.125 == 1/8, using multiplication because it's faster in some browsers	// ^0 floors result
		for (var i = 0; i < n; i++) {
			if(searchElement === ar[i*8])   { return (i*8);}
			if(searchElement === ar[i*8+1]) { return (i*8+1);}
			if(searchElement === ar[i*8+2]) { return (i*8+2);}
			if(searchElement === ar[i*8+3]) { return (i*8+3);}
			if(searchElement === ar[i*8+4]) { return (i*8+4);}
			if(searchElement === ar[i*8+5]) { return (i*8+5);}
			if(searchElement === ar[i*8+6]) { return (i*8+6);}
			if(searchElement === ar[i*8+7]) { return (i*8+7);}
		}

		var n = l % 8;
		for (var i = 0; i < n; i++) {
			if (searchElement === ar[l-n+i]) {
				return l-n+i;
			}
		}

		return -1;
	}
	*/

	/**
	 * Finds the first occurrence of a specified value searchElement in the passed in array, and returns the index of
	 * that value.  Returns -1 if value is not found.
	 *
	 *      var i = createjs.indexOf(myArray, myElementToFind);
	 *
	 * @method indexOf
	 * @param {Array} array Array to search for searchElement
	 * @param searchElement Element to find in array.
	 * @return {Number} The first index of searchElement in array.
	 */
	createjs.indexOf = function (array, searchElement){
		for (var i = 0,l=array.length; i < l; i++) {
			if (searchElement === array[i]) {
				return i;
			}
		}
		return -1;
	}

}());