rajatjain-21

// This implementation does not work with Symbols, BigInts

function stringify(data) {
  if (data === undefined)
    return undefined
  if (data === null)
    return 'null'
  if (data.toString() === "NaN")
    return 'null'
  if (data === Infinity)

rajatjain-21

function PromisePolyfill(executor) {
  let onResolve, onReject;
  let fulfilled = false,
    rejected = false,
    called = false,
    value;

  function resolve(v) {
    fulfilled = true;
    value = v;

rajatjain-21

// -------------------------------------------------------------------
// this function simulates a request that needs to run async
// -------------------------------------------------------------------
function favoriteBlogger(favorite) {
  return new Promise((resolve, reject) => {
    if (favorite === 'rajatexplains') {
      resolve(favorite);
    } else {
      reject('your preference is poor😛');

rajatjain-21

// -------------------------------------------------------------------
// this function simulates a request that needs to run async
// -------------------------------------------------------------------
function doOtherAsyncThing() {
  return new Promise((resolve) => {
    setTimeout(() => resolve('it’s done!'), 500);
  });
}

rajatjain-21

async function getData() {
  // using await means the resolved value of the Promise is returned!
  const response = await fetch('https://blogger.ceo/api/blogs/image/random').then(
    (response) => response.json(),
  ); // .then still works when it makes sense!

  const otherResponse = await doOtherAsyncThing();

  // do stuff with `response` and `otherResponse`