Symbol.asyncIterator

const delayedResponses = {
  delays: [500, 1300, 3500],
  wait(delay) {
    return new Promise((resolve) => {
      setTimeout(resolve, delay);
    });
  },
  async *[Symbol.asyncIterator]() {
    for (const delay of this.delays) {
      await this.wait(delay);
      yield `Delayed response for ${delay} milliseconds`;
    }
  },
};
(async () => {
  for await (const response of delayedResponses) {
    console.log(response);
  }
})();
// Expected output: "Delayed response for 500 milliseconds"
// Expected output: "Delayed response for 1300 milliseconds"
// Expected output: "Delayed response for 3500 milliseconds"

const myAsyncIterable = {
  async *[Symbol.asyncIterator]() {
    yield "hello";
    yield "async";
    yield "iteration!";
  },
};
(async () => {
  for await (const x of myAsyncIterable) {
    console.log(x);
  }
})();
// 期待される出力:
// "hello"
// "async"
// "iteration!"