Scala bubble sort implementation

bubbleSort.scala

object sortings {
  
  def swap(ar: Array[Int], i: Int, j: Int): Array[Int] = {
    val temp = ar(i)
    ar(i) = ar(j)
    ar(j) = temp
    ar
  }

  def bubbleSort(ar: Array[Int]): Array[Int] = {
    for {
      i <- ar.indices
      j <- ar.length - 1 until i by -1
    } if (ar(j) < ar(j - 1)) swap(ar, j, j - 1)
    ar
  }
  
}