async job queue

gistfile1.js

// ES6
[1, 2, 3]
  .map(x => () => new Promise((resolve, reject) => { console.log(x); setTimeout(resolve, 1000); }))
  .reduce((promise, next) => promise.then(next), Promise.resolve())
  .then(() => console.log('Async Job Queue done'));

// jQuery
[1, 2, 3].map(function (val) {
  return function () {
    console.log(val);
    var defer = $.Deferred();
    setTimeout(defer.resolve, 1000);
    return defer;
  };
}).reduce(function (defer, job) {
  return defer.then(job);
}, $.Deferred().resolve()).then(function () { console.log('Async Job Queue done'); });

// Q
[1, 2, 3].map(function (val) {
  return function () {
    console.log(val);
    var defer = Q.defer();
    setTimeout(defer.resolve, 1000);
    return defer.promise;
  };
}).reduce(function (defer, job) {
  return defer.then(job);
}, Q()).then(function () { console.log('Async Job Queue done'); });