Last Promise

gistfile1.js

function requestApi() {
	return $q.when();
}

var wrapApi = lastPromise(requestApi)
	.then(function() {
		// we are done here 
	});

function lastPromise(fn) {
	var deferred, pendingEntries = 0;
	return function() {
		if (pendingEntries===0) {
			deferred = $q.defer()
		}
		fn().then(requestWrap(++pendingEntries));
		return deferred.promise;
	}
	function requestWrap(index){
		return function(data){
			if(index === entries){
				deferred.resolve(data);
				pendingEntries=0;
				deferred = null;  
			}
		}
	}
}

wrapApi(), wrapApi()