const f = (wait_count, string) => (
  new Promise((res, rej) => (setTimeout(() => res(string), wait_count)))
);

async function sequence() {
  const a = await Promise.all([
    f(2000, '2000 wait'),
    f(500, '500 wait'),
    f(1000, '1000 wait')
  ]);

  console.log(a);
}
sequence()