Question

How to shift elements of an array to the left by one position in Scala

Answer 1

def shiftLeftInPlace[A](arr: Array[A]): Unit = {
  if (arr.nonEmpty) {
    val first = arr(0)
    for (i <- 0 until arr.length - 1) {
      arr(i) = arr(i + 1)
    }
    arr(arr.length - 1) = first // optional: wrap first element to the end
  }
}

val arr = Array(0, 1, 2, 3, 4, 5)

shiftLeftInPlace(arr)

println(arr.mkString(", "))



 
/*
run:

1, 2, 3, 4, 5, 0

*/

 

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