JSFiddle - React, Tailwind, and code Playground

JavaScript

const promise1 = new Promise(function(resolve, reject) {
  setTimeout(resolve, 2000, 'foo');
});
const promise2 = 42;
const promise3 = Promise.resolve(2*21);


Promise.all([promise1, promise2, promise3]).then(function(values) {
  alert(values);
});