getDatesScala.scala

def getAllDatesScala(products: List[String]) = {
  val futureAllDates = Future.sequence(products.map(p ⇒ getDates(p)))
  futureAllDates.map(l ⇒
    if (l.exists(_.isLeft))
      None
    else
      Some(l.foldLeft(List[LocalDate]())((acc, e) =>
        e match {
          case Left(_) => acc
          case Right(l) => acc ++ l
        })))
}