dsd.js

let take_bath = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("I have finished my bath");
  }, 5000);
});

let eat = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("I have finished eating");
  }, 3000);
});

Promise.all([take_bath,eat]).then((value) => {
  console.log(value);    // ["I have finished my bath", "I have finished eating"]
});