parallel asyc.js

const Bluebird = require('bluebird');
// https://github.com/charto/cwait
const { TaskQueue } = require('cwait');
// https://github.com/ForbesLindesay/throat
const throat = require('throat')(Bluebird);

const list = new Array(300).fill(0).map((x, i) => i);

async function job(i) {
  console.log('>', i, new Date());
  return new Promise(function(resolve) {
    setTimeout(resolve, i % 2 === 0 ? 1 : 100, i);
  });
}

async function run1() {
  var queue = new TaskQueue(Bluebird, 3);
  const res = await Bluebird.map(list, queue.wrap(job));
  console.log('>>', res);
}

async function run2() {
  // const queue = throat(3);
  const res = await Promise.all(list.map(throat(3, x => job(x))));
  console.log('>>', res);
}

// TODO another one with bluebird?

run1().then(console.log, console.log);