eh

promises.js

new Promise(function(res, rej) {
  return Promise.all([
    1,
    10,
    100,
    1000
  ].map(function createPromises(time) {
    return new Promise(function(res, rej) {
      setTimeout(function() {
        console.log('waited ' + time + ' ms!')
        res()
      }, time)
    })
  })).then(res)
}).then(function() {
  console.log('done!')
})