Filter with Tail Recursion

TailRecursionFilter.scala

def filter[K](list: List[K], f: K => Boolean): List[K] = {
  @tailrec
  def filterRec(list: List[K], f: K => Boolean): List[K] = list match {
    case Nil => list
    case list: List[K] => if (f(list.head)) filterRec(list.head :: list.tail, f) else filterRec(list.tail, f)
  }
  filterRec(list, f)
}

val listToFilter = 2 :: 5 :: Nil

listToFilter.filter(_ > 2)