Asynchronous loop

/**
 * An asynchronous loop implementation
 * 
 * @param  {array} inputArray
 * @param  {function} loopFunction: Function you want to call on each item.
 * @example 
 *
	 	var loopArray = [];

		loopArray.push({ name: 'apple' });
		loopArray.push({ name: 'ball' });
		loopArray.push({ name: 'cat' });
		loopArray.push({ name: 'duck' });

		asyncLoop(loopArray, function(item, index, success) {
			// do something with item
			console.log(item);
			console.log(index);

			success();
		}, function() {
			// success, call the next function
			console.log('Now call something else')
		});
 * 
 * @param  {function} finishedFunction 
 */
function asyncLoop(inputArray, loopFunction, finishedFunction, index) {
	var sliceNextItem = inputArray.shift();

	if(typeof index === 'undefined') {
		index = 0;
	} else {
		index++;
	}

	if(typeof sliceNextItem !== 'undefined') {
		loopFunction(sliceNextItem, index, function() {
			asyncLoop(inputArray, loopFunction, finishedFunction, index);
		});
	} else {
		finishedFunction();
	}
}