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forEach function - fastest loop iteration

/ Published in: JavaScript
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hope you enjoy - thanks to Tom Duff (for implementation in C), Dean Edwards, and Nicholas Zakas for the idea

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  1. forEach = (function()
  2. {
  3. 	/**
  4. 	* USAGE
  5.         * instead of:
  6.         * for(var i=0, il=some.length; i<il; i++)
  7.         * Use this:
  8. 	* forEach(object, function(i){
  9. 	*	i.doSomething();
  10. 	* }, context);
  11.         *
  12.         * or this:
  13.         * forEach(object, function(i){
  14.         *       i.doSomething();
  15.         * });
  16.         *
  17. 	* @param object elementNodeList || array
  18. 	* @param block function
  19. 	* @param context inherited by the this object
  20. 	*/
  21. 	return function(object, block, context)
  22. 	{
  23. 		var len = Math.floor(object.length / 4),
  24. 			left = object.length % 4, i = 0;
  25. 		if(left > 0){
  26. 			do {
  27. 				block.call(context, object[i++], i, object);
  28. 			} while (--left > 0);
  29. 		};
  30. 		while(len-- > 0)
  31. 		{
  32. 			block.call(context, object[i++], i, object);
  33. 			block.call(context, object[i++], i, object);
  34. 			block.call(context, object[i++], i, object);
  35. 			block.call(context, object[i++], i, object);
  36. 		};
  37. 	};
  38. })();

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