kastoestoramadus

package pl.japila.scalania.s99

object S99_P03 {
  def nth[T](k: Int, ts: List[T]): Option[T] = {
    if (k > 0) ts match {
        case a :: tail => nth(k - 1, tail)
        case Nil => None
      }
    else if (k == 0) Some(ts.head)
         else None

kastoestoramadus

package pl.japila.scalania.s99

object S99_P02 {
  def penultimate[T](ts: Seq[T]): T = ts match {
    case a :: b :: Nil => Some(a)
    case a:: tail => None
    case _ => penultimate(ts.tail)
  }
}