Test promises

promises.js

await Promise.all([
  new Promise((resolve) => setTimeout(() => {resolve('A (slow)'); console.log('A (slow)')}, 1000)),
  new Promise((resolve) => setTimeout(() => {resolve('B (slower)'); console.log('B (slower)')}, 2000)),
  new Promise((resolve) => setTimeout(() => {resolve('C (fast)'); console.log('C (fast)')}, 10))
])

const promises = Array.from({ length: 1000 }, (_, i) => i).map(item => new Promise((resolve) => setTimeout(() => {
  resolve('A');
  console.log('resolved')
}, 3000)))