Using async / await with reduce in Javascript

I got stumped trying to figure out how to use async / await. Here's how you do it:

async function buildObject(items) {    // promise here is technically the accumulator so we await to get it  return items.reduce(async (promise, item) => {    const obj = await promise;    obj[item.id] = await getItem();        // return the object as usual    return obj        // resolve an empty object (the thing we want)  }, Promise.resolve({}));}

Pretty sick huh