49. In this question, we have a timer function that returns a Promise that resolves after a random amount of time. We use Promise.all to resolve an array of timers. What gets logged?

const timer = a => {
  return new Promise(res =>
    setTimeout(() => {
      res(a);
    }, Math.random() * 100)
  );
};

const all = Promise.all([
  timer('first'),
  timer('second')
]).then(data => console.log(data));