async+generators

async_demo.js

const g = function* (array) {
  for(let e of array) {
    yield new Promise((resolve, reject) => {
      return setTimeout(()=>{resolve(e)}, 1000)
    })
  }
}

for(let f of g([1,100,23])) {
  f.then(console.log)
}

const g2 = g([64,298,112])
const waiting = () => {
  console.log('waiting')
  const yieldedPromise = g2.next().value
  if(yieldedPromise) {
    yieldedPromise
      .then(console.log)
      .then(waiting)
  }
}
waiting()
const waiting2 = async() => {
  for(let f of g([1234,198700,8823])) {
    await f.then(console.log)
    console.log('waiting2')
  }
}
waiting2()