PatternMatch.scala

def eatVegetable(vegetable: Vegetable): String =
  vegetable match {
    case Pea(colour, isCooked) =>
      s"Oh great, a ${if (isCooked) "uncooked" else "cooked" } $colour pea."
    case Eggplant(colour, _) =>
      s"No matter how I cook this $colour eggplant, it'll still be the blandest vegetable around."
    case ChocolateCake(layers, _) =>
      s"Yum, a $layers-layer chocolate cake – the best vegetable of all."
  }