gistfile1.scala

case class MyClass(intAttr: Int, listAttr: List[String], mapAttr: Map[String,Int]) {
  def updated(
      intAttr  : Int => Int                         = identity,
      listAttr : List[String] => List[String]       = identity,
      mapAttr  : Map[String,Int] => Map[String,Int] = identity) = {
    MyClass(intAttr(this.intAttr), listAttr(this.listAttr), mapAttr(this.mapAttr))
  }
}

object Test extends App {
  override def main(args: Array[String]) {
    val x = MyClass(42, List("foo", "bar"), Map("baz" -> 37, "qux" -> 1000))
    val y = x.updated(intAttr = _ * 100, listAttr = "42" :: _) // MyClass(4200, ...)
    val z = y.updated(listAttr = _.reverse, mapAttr = _.updated("baz", 73))
  }
}