explicitPromises.js

function makeSoup() {
  return Promise.all([
    new Promise((reject, resolve) => {
      chopCarrots();
      chopOnions();
      resolve();
    }),
    boilPot()
  ]).then(() => {
    addCarrots();
    return letPotKeepBoiling(5);
  }).then(() => {
    addOnions();
    return letPotKeepBoiling(10);
  }).then(() => {
    console.log("Vegetable soup done!");
  });
}