Min/max with Option[T] for possibly empty Seq?

Question

I\'m doing a bit of Scala gymnastics where I have Seq[T] in which I try to find the \"smallest\" element. This is what I do right now:

val leastOrNo         


        

Answer 1

seq.reduceOption(_ min _)

does what you want?

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Edit: Here's an example incorporating your _.something:

case class Foo(a: Int, b: Int)
val seq = Seq(Foo(1,1),Foo(2,0),Foo(0,3))
val ord = Ordering.by((_: Foo).b)
seq.reduceOption(ord.min)  //Option[Foo] = Some(Foo(2,0))

or, as generic method:

def minOptionBy[A, B: Ordering](seq: Seq[A])(f: A => B) = 
  seq reduceOption Ordering.by(f).min

which you could invoke with minOptionBy(seq)(_.something)