Function that returns the first failure or the first success out of an iterator of Try, without exhausting the iterator

firstSuccessOrFirstFailure.scala

    /** Returns the first failure or the first success out of an iterator of Try, taking care not to
     * exhaust the iterator when possible.
     *
     * @param tries          The iterator of Try. Must not be empty.
     * @param defaultFailure The return value to use if all tries left in the iterators are
     *                       failures. If this is None, use the first failure from the iterator.
     * @return the first success out of the iterator, or the first failure if there is no success
     */
    @tailrec
    def firstSuccessOrFirstFailure[A](
      tries: Iterator[Try[A]],
      defaultFailure: Option[Failure[A]] = None
    ) : Try[A] = {
      tries.next() match {
        case s: Success[A] => s
        case f: Failure[A] =>
          val newDefaultFailure = defaultFailure.getOrElse(f)
          if(tries.hasNext) {
            firstSuccessOrFirstFailure(tries, Some(newDefaultFailure))
          } else {
            newDefaultFailure
          }
      }
    }