q

I use mbostock/queue for queuing few async operation. It is more to rate limit (UI generate few events, where the backend can process it slowly), and also to make sure they are processed sequentially. I use it like function request(d, cb) { //some async oper add.then(function(){ cb(null, "finished ") }) } var addQ = queue(1); addQ.defer(request) //called by few req at higher rates generated by UI I already uses angular.js $q for async operation. So, do I have to use mbostock/queue , or can I build a queue out of $q (which is in spirit https://github.com/kriskowal/q ) Thanks. Basic $q Chain

I'm using mongoose to insert some data into mongodb. The code looks like: var mongoose = require('mongoose'); mongoose.connect('mongo://localhost/test'); var conn = mongoose.connection; // insert users conn.collection('users').insert([{/*user1*/},{/*user2*/}], function(err, docs) { var user1 = docs[0], user2 = docs[1]; // insert channels conn.collection('channels').insert([{userId:user1._id},{userId:user2._id}], function(err, docs) { var channel1 = docs[0], channel2 = docs[1]; // insert articles conn.collection('articles').insert([{userId:user1._id,channelId:channel1._id},{}], function(err,

I need helps on notify() within the promise chain. I have 3 promise base functions connect() , send(cmd) , disconnect() . Now I would like to write another function to wrap those call in following manner with progress notification. function bombard() { return connect() .then(function () { var cmds = [/*many commands in string*/]; var promises = _.map(cmds, function (cmd) { var deferred = Q.defer(); deferred.notify(cmd); send(cmd).then(function (result) { deferred.resovle(result); }); return deferred.promise; }); return Q.all(promises); }) .finally(function () { return disconnect() }) } Run the

I'm getting into promises pattern with Q and I keep getting warning "[Q] Unhandled rejection reasons (should be empty)" in console. What em I doing wrong? http://jsfiddle.net/FpyDr/1/ function load(url) { var deferred = Q.defer(); $.ajax({ type: "GET", processData: false, dataType: "html", url: url, cache: false }).done(function (response, status, xhr) { deferred.reject(new Error("test error")); return; }).fail(function (xhr, status, error) { deferred.reject(new Error("ajax failed")); return; }); return deferred.promise; } load("http://fiddle.jshell.net") .then(function (result) { console.log(

async vs. Q generally I'm learning Node.js development, and trying to wrap my brain around strategies for managing asynchronous "callback hell". The two main strategies I've explored are Caolan McMahon's async module, and Kris Kowal's promise-based Q module. Like many other people , I'm still struggling to understand when you should use one vs. the other. However, generally speaking I have found promises and Q-based code to be slightly more intuitive, so I have been moving in that direction. Mapping/Concatenating collections generally However, I'm still stuck using the async module's functions