SetF

SetF.scala

final case class SetF[A](_future: Future[Iterable[A]]) extends AnyVal {
    def future: Future[Set[A]] = _future.map(_.toSet)
    def flatMap[B](f: A => SetF[B]): SetF[B] = {
        val newFuture: Future[Set[B]] = for {
          list: Set[A]        <- future
          result: Set[Set[B]] <- Future.sequence(list.map(f(_).future))
        } yield {
          result.flatten
        }
        SetF(newFuture)
    }
    def withFilter(f: A => Boolean): SetF[A] = SetF(future.map(_.filter(f)))
    def map[B](f: A => B): SetF[B] = SetF(future.map(option => option.map(f)))
}