Return the first resolved promise result or the last rejected error

Promise.first.js

function promiseFirst(promises) {
  function tryResolve([x, ...xs], resolve, reject) {
    if (xs.length > 0)
      x.then(resolve).catch(_ => tryResolve(xs, resolve, reject))
    else
      x.then(resolve).catch(reject)
  }
  return new Promise((resolve, reject) =>
    tryResolve(promises, resolve, reject)
  )
}

const promises = [Promise.reject(0),
                  Promise.resolve(1),
                  Promise.reject(0)]

promiseFirst(promises).then(console.log)
                      .catch(e => console.error('Error:', e))

// == 1