Create Phone Number

My:
object Kata {
  def createPhoneNumber(numbers: Seq[Int]):String = {
    numbers.mkString("").replaceFirst("(\\d{3})(\\d{3})(\\d+)", "($1) $2-$3")
  }
}

Other:
object Kata {
  def createPhoneNumber(numbers: Seq[Int]) = {
    val ns = numbers.mkString
    s"(${ns.take(3)}) ${ns.slice(3, 6)}-${ns.drop(6)}"
  }
}