Similar to Array.each, but loops in batches, use setTimeout to allow the Browser thread to do other things, like respond to UI events and changes. Useful for really big arrays, or really intensive functions.

Array.batch.js

Array.implement('batch', function(callback, loopsPerBatch, delay, bind) {
	if(!loopsPerBatch) loopsPerBatch = 10;
	if(!delay) delay = 50;
	if(callback) {
		var loops = 0,
			index = 0,
			that = this;
		function doLoops() {
			loops = 0;
			for (var length = that.length; (index < length) && loops < loopsPerBatch; index++) {
				loops++;
				callback.call(bind, that[index], index, that);
			}
			if(index < length) {
				doLoops.delay(delay);
			}
		}
		doLoops();
	}
})