hvrauhal

var Promise = require('bluebird');

var funcs = Promise.resolve([100, 200, 300, 400].map((n) => makeWait(n)));

console.log('first with {concurrency: 1}');
funcs
  .map(iterator, {concurrency: 1})
  .then(function(r) { console.log('Resolved with', r) } )
  .then(function() {
    console.log('then with mapSeries');