Making a partial function complete

Question

Is there a standard way to complete a partial function PartialFunction[A, B]? Something like this:

completePartialFunction(pf: PartialFunction[A, B], z: B): A => B

or

completePartialFunction2(pf: PartialFunction[A, B], f: A => B): A => B

Answer 1

Yes, it's actually very simple:

  def complete[A, B](pf: PartialFunction[A, B])(f: A => B): A => B =
    pf.applyOrElse(_, f)