icecream-async-await.js

function getIceCreamById (iceCreamId) {
  return fetch(`/icecream/${id}`);
}
const iceCreamIds = [4, 5, 10, 12];

// Slow, effectively synchronous
for (let iceCreamId of iceCreamIds) {
  console.log(await getIceCreamById(iceCreamId));
}

// Concurrent, but waits for everything to complete before logging
const iceCreamsPromise = Promise.all(iceCreamIds.map(iceCreamId => getIceCreamById(iceCreamId)));
for (let iceCream of await iceCreamsPromise) {
  console.log(iceCream);
}

// Concurrent, logs each as the request finishes
const iceCreamsPromise = await Promise.all(
  iceCreamIds.map(async iceCreamId => { console.log(await getIceCreamById(iceCreamId)) })
);