function logPromise(msg) {
  console.log(`Promise ${msg}`)
  return Promise.resolve(msg).then(x => {
    console.log(`Promise ${msg} resolved`)
    return x
  })
}

;(async () => {
  const promises = []
  promises.push(logPromise(0))
  setTimeout(() => {
    promises.push(logPromise(1))
    setTimeout(() => {
      promises.push(logPromise(2))
      setTimeout(async () => {
        promises.push(logPromise(3))
        await Promise.all(promises)
        console.log('Parallel?')
      }, 1000)
    }, 1000)
  }, 1000)
})()