❗️Что будет на выходе?

async function asyncArrayOperations() {
  const array1 = [1, 2, 3];
  const array2 = [4, 5, 6];
  const array3 = [7, 8, 9];

  const result = await Promise.all([array1, array2, array3].map(async arr => {
    return await arr.filter(async (acc, num) => {
      return (await acc) + num;
    }, Promise.resolve(0));
  }));

  console.log(result);
}

asyncArrayOperations();

Ответ: [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ]

JavaScript test | #JavaScript