Advanced Async Patterns in JavaScript

// Async iterator
async function* asyncGenerator() {
  yield await fetch('/page/1');
  yield await fetch('/page/2');
  yield await fetch('/page/3');
}

for await (const page of asyncGenerator()) {
  console.log(await page.json());
}

// Retry pattern
async function retry(fn, retries = 3) {
  try {
    return await fn();
  } catch (err) {
    if (retries > 0) {
      await delay(1000);
      return retry(fn, retries - 1);
    }
    throw err;
  }
}