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

How about this?

//WRONG
def restrict(floor : Option[Double], cap : Option[Double], amt : Double) : Double = 
   (floor.getOrElse(amt) max amt) min cap.getOrElse(amt)

[Edit]

Second try:

def restrict(floor : Option[Double], cap : Option[Double], amt : Double) : Double = 
   floor.map(f => f max _).getOrElse(identity[Double] _)(
     cap.map(c => c min _).getOrElse(identity[Double] _)(amt))

Looks a little bit too "lispy" for my taste, but passes the tests :-)

[2nd Edit]

The first version can be "repaired", too:

def restrict(floor: Option[Double], cap: Option[Double], amt: Double): Double =
  (floor.getOrElse(-Double.MaxValue) max amt) min cap.getOrElse(Double.MaxValue)