minBy and maxBy for Traversable

min-max-usage.scala

println("Sorted: " + list.sortBy(_.balance))
println("Max: " + list.maxBy(_.balance))
println("Min: " + list.minBy(_.balance))

minBy-maxBy.scala

// implicits

class RichTraversable[T](t: Traversable[T]) {
    def maxBy[B](fn: T => B)(implicit ord: Ordering[B]) = t.max(ord on fn)
    def minBy[B](fn: T => B)(implicit ord: Ordering[B]) = t.min(ord on fn)
}

implicit def toRichTraversable[T](t: Traversable[T]) = new RichTraversable(t)

// example

case class Account(val balance: Int)

val list = List(Account(100), Account(250), Account(35), Account(410), Account(112))

println("Sorted: " + list.sortBy(_.balance))
println("Max: " + list.maxBy(_.balance))
println("Min: " + list.minBy(_.balance))