promiseQueue.js

function step1(result) {
  console.log('call step1');
  return new Promise(function(resolve, reject) {
    console.log('resolve step1');
    result['step1'] = 'Step 1';
    return resolve(result);
  });
}

function step2(result) {
  console.log('call step2');
  return new Promise(function(resolve, reject) {
    console.log('resolve step2');
//    return reject(new Error('Step 2'));
    result['step2'] = 'Step 2';
    return resolve(result);
  });
}

function step3(result) {
  console.log('call step3');
  return new Promise(function(resolve, reject) {
    console.log('resolve step3');
    result['step3'] = 'Step 3';
    return resolve(result);
  });
}

function resolved(result) {
  console.log(`Done:`, result);
}

function failed(error) {
  console.warn(error);
}

function runQueue(queue, result) {
  return queue.reduce(function(p, c) {
    return p.then(c);
  }, Promise.resolve(result || {}));
}

/*
es6:
const runQueue = (queue, result) =>
  queue.reduce((p, c) => p.then(c), Promise.resolve(result || {}));

*/

runQueue([step1, step2, step3]).then(resolved).catch(failed);