happyNumbers.scala

def happy_?(i:Int) = {
  def sumOfSquares(n:Int) = n.toString.map(_ - '0').map(d=>d*d).sum
  val numbers = Stream.iterate(i)(sumOfSquares)
  def contents:Stream[Set[Int]] = Set[Int]() #:: (numbers zip contents).map{case (n, s) => s + n}
  val stopNumber = (numbers zip contents) find {case (n,s) => n == 1 || s.contains(n)}
  stopNumber match {case Some((1,_)) => "happy"; case _ => "sad"} 	
}