Fetch data with Promise concurrently

promise_all.js

let fetchData = async () => {
  const res = await fetch('https://bookshelf.gq/api/books');
  const data = await res.json();

  console.log('data is ready', data);

  const res2 = await fetch('https://dikz.herokuapp.com/api/latest');
  const data2 = await res2.json();

  console.log('data2 is ready!', data2);
};

let fetchDataConcurrent = async () => {
  const res = fetch('https://bookshelf.gq/api/books').then((res) => res.json());
  const res2 = fetch('https://dikz.herokuapp.com/api/latest').then((res) =>
    res.json()
  );

  const data = await Promise.all([res, res2]);

  console.log('data is ready', data[0]);
  console.log('data2 is ready!', data[1]);
};