RGB To Hex Conversion

My:
object Kata {

 def rgb(r: Int, g: Int, b: Int): String ={
  val l=List[Int](r,g,b).map[Int](x=>
  {if(x<0) 0
  else if(x>255) 255
  else x})
  String.format("%02X%02X%02X", l(0), l(1), l(2))}
}

Other:
object Kata {

  def rgb(r: Int, g: Int, b: Int) = {
    def rnd(n: Int) = n max 0 min 255
    "%02X%02X%02X" format (rnd(r), rnd(g), rnd(b))
  }
}