Promise Collections

parallel.js

var q = require('q');

// Parallel

q.all(array.map(function (elem) {
    return processElem(elem);
}));

// Or simply

q.all(array.map(processElem));

serie.js

var q = require('q');

// If the current element depends on the ones below

array.reduce(function (promise, elem) {
  return promise.then(function (result) {
    return processElem(elem, result);
  });
}, q());


// If not

array.reduce(function (promise, elem) {
  return promise.then(function () {
    return processElem(elem);
  });
}, q());