deconchaemconcha.js

var arrayzao = [
  'a',
  'e',
  'i',
  'o',
  'u',
  'æ'
]

const delay = x => new Promise(res => {
  const delay = (1 + Math.random()) * 300
  setTimeout(() => res(x), delay)
})

const gen = function *(arr) {
  for (let i=0; i<arr.length; i=i+2) {
    yield Promise.all([delay(arr[i]), delay(arr[i + 1])])
  }
}

;(async () => {
  for await (const [a0, a1] of gen(arrayzao)) {
    console.log(`a0=${a0} a1=${a1}`)
  }
})()