Project Euler #2 - Scala

gistfile1.scala

def fib(v1:Int, v2:Int): Stream[Int] = v1 match {
  case 0 => Stream.cons(1,fib(1,0))
  case 1 => Stream.cons(2,fib(2,1))
  case _ => Stream.cons(v1+v2,fib(v1+v2,v1))
}
val fibStream = fib(0,0)
   
fibStream.filter(_%2 == 0).takeWhile(_ <= 4000000).foldLeft(0)(_+_) //returns 4613732