JavaScript serial and parallel execution

serial-parallel.js

const delay = 1000;
const iterations = 3;
const fakeRequest = () => new Promise((resolve, reject) => {
  setTimeout(() => resolve(11), delay);
});

// Sync
(async () => {
  console.time('sync');
  const result = [];
  for (let i = 0; i < iterations; i++) {
    const data = await fakeRequest();
    result.push(data);
  }
  console.timeEnd('sync');
})();


// Async
(async () => {
  console.time('async');
  const result = [];
  const requests = [];
  for (let i = 0; i < iterations; i++) {
    const request = fakeRequest().then(data => result.push(data));
    requests.push(request);
  }
  await Promise.all(requests);
  console.timeEnd('async');
})();

// async: 1.002s
// sync: 3.006s