❗️Что будет на выходе:

const fetchData = async (id) => {
  return new Promise((resolve) => {
    setTimeout(() => resolve(`Data for ID ${id}`), 100);
  });
};

const ids = [1, 2, 3];

async function complexAsyncFetch(ids) {
  const result = await ids.reduce(async (acc, id) => {
    const data = await fetchData(id);
    const currentResult = await acc;
    currentResult.push(data);
    return currentResult;
  }, Promise.resolve([]));

  console.log(result);
}

complexAsyncFetch(ids);

Ответ: ['Data for ID 1', 'Data for ID 2', 'Data for ID 3']

JavaScript test | #JavaScript