(async () => {
    const delayed = v => new Promise(resolve => setTimeout(() => {
        console.log(`delayed - ${v}`);
        return resolve(v);
    }, Math.random() * 1000));

    const test = [1, 2, 3, 4, 5];

    const testMap = await Promise.all(test.map(async v => await delayed(v)));
    console.log(testMap);

    const testReduce = await test.reduce(async (a, v) => [...(await a), (await delayed(v))], []);
    console.log(testReduce);
})();