Promise.any - async/await vs then()

functional.js

let pending = new Promise((r,rj) => {})
let waitForever = () => pending
let reject = Promise.reject.bind(promise)
let identity = x => x
let promiseTransform = fns => p => p.then(fns.fullfilment, fns.rejection)

function any(promises) {
  let fulfillments = promises.map(promiseTransform({fullfilment: identity, rejection: waitForever}))
  let rejections   = promises.map(promiseTransform({fullfilment: waitForever, rejection: identity}))
  let firstFulfill = Promise.race(fulfillments);
  let allRejected  = Promise.all(rejections)
  return Promise.race([firstFulfill, allRejected.then(reject)]);
}

imperative.js

async function any(promises) {
  let rejections = [];
  for (let promise in promises) {    
    try {
      return await promise;
    } catch (reason) {
      rejections.push(reason);
    }
  }
  throw rejections;
}