Example of using promise all and race function with async function

async.function.promise.all.and.race.js

//TODO: Add console.log results

async function foo () {
  console.log('foo-start');
  const result = await 'a';
  console.log('foo-end');
  return result;
}

async function boo() {
  console.log('boo-start');
  const result = await 'b';
  console.log('boo-end');
  return result;
}

const all_promise = Promise.all([foo(), boo()]);

all_promise.then(results => {
  console.log('all `foo` result:', results[0]);
  console.log('all `boo` result:', results[1]);
});

// foo-start
// boo-start
// foo-end
// boo-end
// all `foo` result: a
// all `boo` result: b

const race_promise = Promise.race([foo(), boo()]);

race_promise.then(result => {
  console.log('race result:', result);
});
// foo-start
// boo-start
// foo-end
// boo-end
// race result: a