Scala functional programming gymnastics

Question

I am trying to do the following in as little code as possible and as functionally as possible:

def restrict(floor : Option[Double], cap : Option[Double], amt : D         


        

Answer 1

This isn't really much easier in Scalaz than in regular Scala:

def restrict(floor: Option[Double], cap: Option[Double], amt: Double) =
  floor.map(amt max).orElse(Some(amt)).map(x => cap.map(x min).getOrElse(x)).get

(Add _ after max and min if it makes you feel better to see where the parameter goes.)

Scalaz is a little easier to read, though, once you understand what the operators do.