Scala: Pattern matching when one of two items meets some condition

Question

I\'m often writing code that compares two objects and produces a value based on whether they are the same, or different, based on how they are different.

So I might writ

Answer 1

You should be able to do it if you define it as a val first:

val MyValThatIsCapitalized = new OneAndOnlyOne(v: Option[Foo] => v.isDefined )
val result = (v1,v2) match {
  case (Some(value1), Some(value2)) => "a"
  case MyValThatIsCapitalized(value) => "b"
  case _ = > "c"
}

As implied by the name, the name of the val containing the extractor object must be capitalized.