Question

How to cyclically rotate the elements of an int array right by one in Scala

Answer 1

def cyclicallyRotateArrayRightByOne(arr: Array[Int]): Array[Int] = {
  if (arr.isEmpty) return arr

  val lastElement = arr.last
  
  for (i <- arr.length - 1 until 0 by -1) {
    arr(i) = arr(i - 1)
  }
  arr(0) = lastElement
  
  arr
}


val arr = Array(8, 9, 0, 3, 6, 1)

val rotatedArr = cyclicallyRotateArrayRightByOne(arr)

println(rotatedArr.mkString(", "))  



/*
run:

1, 8, 9, 0, 3, 6

*/

 

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