```js
function* producer() {
  let index = 0;
  while (1)
    yield index++;
}

let consumer = () => {
  let data = producer();

  console.log(data.next().value); // 0
  console.log(data.next().value); // 1
  console.log(data.next().value); // 2
  console.log(data.next().value); // 3
}