async.auto

async-auto.js

var _ = require('underscore');
var async = require('async');

async.auto({
	first: function(next) {
		setTimeout(next, 500);
	},
	second: function(next) {
		setTimeout(next, 700);
	},
	third: ['first', 'second', function(next) {
		setTimeout(next, 2000);
	}],
	final: ['third', function(next) {
		next(null, 'OK');
	}]
}, function(error, results) {
	console.log(error, results);
});