async-promise.js

// we'll use arrow functions for brevity
let asynchProm = new Promise((resolve, reject) => {
  let fakeCode = 200;
  window.setTimeout(() => {
    if (fakeCode === 200) {
      resolve({status: "OK"})
    } else {
      reject({status: "ERROR"})
    }
  }, 3000);
});
asynchProm
  .then((result) => console.log(result.status))
  .catch((result) => console.log(result.status))
console.log("Load up your page");
// LOG: Load up your page
** 3 seconds will pass **
// LOG: OK