wordcount example in scalaz using State monad

gistfile1.scala

import scalaz._
import Scalaz._

def charLineCount[T[_]:Traverse](t: T[Char]) =
  t.traverse[({type λ[x] = State[(Int, Int),x]})#λ, (Int, Int)](a =>
    state((counts: (Int, Int)) =>
      ((counts._1 + 1, counts._2 + (if (a == '\n') 1 else 0)), (counts._1, counts._2)))) ! (1,1)

println(charLineCount("the cat in the hat\n sat on the mat\n".toList).last) // (35, 2)

Thanks for this, I am trying to grok the state monad at the moment and this helps.

There's a nice example in scalaz examples distribution too ..