Get the Middle Character

My:
object MiddleChar {
  def middle(s: String): String =
  if(s.length()%2==0) s.charAt((s.length()/2)-1).toString()+s.charAt((s.length()/2));
  else s.charAt(s.length()/2).toString();
}

Other:
object MiddleChar {
  def middle(s: String): String =
    s.slice((s.size-1)/2, s.size/2+1)
}