Partial Functions in Scala

Question

I just wanted to clarify something about partially defined functions in Scala. I looked at the docs and it said the type of a partial function is PartialFunction[A,B]

Answer 1

If you are looking to set up a partial function that, in effect, takes multiple parameters, define the partial function over a tuple of the parameters you'll be feeding into it, eg:

val multiArgPartial: PartialFunction[(String, Long, Foo), Int] = {
  case ("OK", _, Foo("bar", _)) => 0 // Use underscore to accept any value for a given parameter
}

and, of course, make sure you pass arguments to it as tuples.