Futures / Success race

Question

I\'m learning futures, and I\'m trying to create a method that, take two futures as parameter (f and g) and return the first future that was succes

Answer 1

I completely agree with the previous answer, still i hope my example will clarify it a bit further, so:

def successRace[T](f: Future[T], g: Future[T]): Future[T] = {
  val promise = Promise[T]()

  f onComplete(promise.tryComplete(_))
  g onComplete(promise.tryComplete(_))

  promise.future
}

so the first completed Future will set the value wrapped in Try (so, Success or Failure).