leftShiftArray

// =======================
// Arrays: Left Rotation
// =======================

def leftShift(input: Array[Int], rotations: Int): Unit = {

  val tmpArray = new Array[Int](total)
  
  val total = input.length
  val pos = total - math.abs(rotations % total)

  for (x <- 0 to total - pos - 1) {
    tmpArray(pos + x) = input(x)
  }
  
  for (x <- 0 to pos - 1) {
    tmpArray(x) = input(total - pos + x)
  }
  
  Array.copy(tmpArray, 0, input, 0, total)
}


var a = Array(1, 2, 3, 4)
leftShift(a, 2)

println(a.mkString(" "))

// result: 3 4 1 2

var a = Array(1, 2, 3, 4, 5, 6, 7)
leftShift(a, 15)

println(a.mkString(" "))

// result: 2 3 4 5 6 7 1