Scala: short form of pattern matching that returns Boolean

Question

I found myself writing something like this quite often:

a match {     
  case `b` => // do stuff
  case _ => // do nothing
}

Is there

Answer 1

The best I can come up with is this:

def matches[A](a:A)(f:PartialFunction[A, Unit]) = f.isDefinedAt(a)

if (matches(a){case ... =>}) {
    //do stuff
}

This won't win you any style points though.