Promises and Async/Await

Promises represent the eventual completion or failure of an asynchronous operation.

let promise = new Promise((resolve, reject) => {
  setTimeout(() => resolve("Done!"), 1000);
});

promise.then(result => console.log(result));

Async/Await makes it easier to write readable asynchronous code.

async function fetchData() {
  const data = await fetch("/api/data");
  const json = await data.json();
  console.log(json);
}