JS: AngularJS Debounced Function Factory. Relies on $timeout.

DebouncedFunction.Service.js

/**
 * This creates a trailing debounced function. The callback will only be executed at the end
 * of the specified delay. Repeated calls to the debounced function will cancel the previous
 * call, and restart the delay. This is perfect for form inputs that you only want to act upon
 * after the user stops entering characters. 
 * @param  {Function} callback Callback to be executed when there is no more repeated calls to 
 *                             the debounced function and when the delay has counted down
 * @param  {Integer}  delay    Delay in milliseconds. This delay will be refreshed each time 
 *                             there is a repeated call to the throttled function
 * @return {Function}          Debounced function
 */
this.createDebouncedFunction = function(callback, delay){

	var listOfIterations = [];
	var prevIteration;

	return function(){

		prevIteration = listOfIterations.shift();
		if(prevIteration){
			$timeout.cancel(prevIteration);
		}

		listOfIterations.push($timeout(function(){
			callback();
		}, delay));

	};

};