Angular debounce

Angular debounce method

// From http://stackoverflow.com/questions/13320015/how-to-write-a-debounce-service-in-angularjs
  .factory('debounce', function($timeout, $q) {
		return function(func, wait, immediate) {
			var timeout;
			var deferred = $q.defer();
			return function() {
				var context = this, args = arguments;
				var later = function() {
					timeout = null;
					if(!immediate) {
						deferred.resolve(func.apply(context, args));
						deferred = $q.defer();
					}
				};
				var callNow = immediate && !timeout;
				if ( timeout ) {
					$timeout.cancel(timeout);
				}
				timeout = $timeout(later, wait);
				if (callNow) {
					deferred.resolve(func.apply(context,args));
					deferred = $q.defer();
				}
				return deferred.promise;
			};
		};
	})