https://github.com/petkaantonov/bluebird/issues/1011

b3.js

#!/usr/bin/env node

'use strict';

var Promise = require('bluebird');

function delayResolve(t) {
  return new Promise(function(resolve, reject) {
    setTimeout(function() { resolve(t); }, t); }); }

function delayReject(t) {
  return new Promise(function(resolve, reject) {
    setTimeout(function() { reject(t); }, t); }); }

// .map() vs .each() vs. mapSeries() vs. filter()

//   bluebird@3.3.1
//   node@4.2.6

var p0 = Promise.resolve(delayResolve(200));

p0.then(function() {
  var p1 = delayResolve(500);
  var p2 = delayReject(300);
  var p3 = delayResolve(400);
  return Promise.all([p1,p2,p3].map(function(p) { return p.reflect(); })) })
.map(function(p) {
  return p.isFulfilled() ? p.value() : null; })
.then(function(r) {
  console.log(JSON.stringify(r)); }); // -> [500,null,400]

/* Possible reflection issue in .each() ? */

p0.then(function() {
  var p1 = delayResolve(500);
  var p2 = delayReject(300);
  var p3 = delayResolve(400);
  return Promise.all([p1,p2,p3].map(function(p) { return p.reflect(); })) })
.each(function(p) {
  return p.isFulfilled() ? p.value() : null; })
.then(function(r) {
  console.log(JSON.stringify(r)); });

// -> [{"_bitField":268435457,"_settledValue":500},
//     {"_bitField":135266305,"_settledValue":300},
//     {"_bitField":268435457,"_settledValue":400}]

/* Same reflection issue than .each() ? */

p0.then(function() {
  var p1 = delayResolve(500);
  var p2 = delayReject(300);
  var p3 = delayResolve(400);
  return Promise.all([p1,p2,p3].map(function(p) { return p.reflect(); })) })
.filter(function(p) {
  return p.isFulfilled() ? p.value() : null; })
.then(function(r) {
  console.log(JSON.stringify(r)); });

// -> [{"_bitField":268435457,"_settledValue":500},
//     {"_bitField":268435457,"_settledValue":400}]

/* .mapSeries() untested because of throwing <not a function> error in node */

p0.then(function() {
  var p1 = delayResolve(500);
  var p2 = delayReject(300);
  var p3 = delayResolve(400);
  return Promise.all([p1,p2,p3].map(function(p) { return p.reflect(); })) })
.mapSeries(function(p) {
  return p.isFulfilled() ? p.value() : null; })
.then(function(r) {
  console.log(JSON.stringify(r)); });

// TypeError: p0.then(...).mapSeries is not a function
//    at Object.<anonymous> (/.../b3.js:70:2)
//    at Module._compile (module.js:410:26)
//    at Object.Module._extensions..js (module.js:417:10)
//    at Module.load (module.js:344:32)
//    at Function.Module._load (module.js:301:12)
//    at Function.Module.runMain (module.js:442:10)
//    at startup (node.js:136:18)
//    at node.js:966:3