object Test extends App {

  case class MyData(val x: Int, val y: String, val z: List[Int])
  case class MyResults(val x: Int, val y: String, val z: Int)

  def applyChanges (data: MyData) = MyResults(
    data.x + 1,
    data.y.substring(0, 3),
    data.z.reduce(_ + _)
  )

  val data = MyData(10, "foobar", List(1, 2, 3))

  val results = applyChanges(data)

  println(results)

}