Perform Async Action over Items using Async/Await

async_action_for_items.js

const results = await items.reduce(async (previousPromise, item) => {
    const collection = await previousPromise;

    try {
        const result = await doSomethingAsync(item);

        collection.successes.push(result);
    } catch(e) {
        collection.errors.push(e);
    }

    return collection;
}, Promise.resolve({successes: [], errors: []}));