Promise.all example

promise-all.js

const createAPromise = s => new Promise((resolve) => {
  console.log(`this promise will resolve in ${s} seconds`);
  setTimeout(() => {
    resolve(s);
    console.log(`promise solved after ${s} seconds`);
  }, s * 1000);
});

const promises = [];

for (let i = 10; i--;) promises.push(createAPromise(i + 1));

Promise.all(promises).then((allResults) => {
  console.log('All promises have been resolved', allResults);
});