Reverse Function

ReversFunction.kt

private fun reverseArr(array:ArrayList<Int>):ArrayList<Int>{
        val reversedArr:ArrayList<Int> = ArrayList()
        reversedArr.addAll(array)
        var initElementIdx = reversedArr.size
        array.forEachIndexed { index, num ->
            reversedArr[initElementIdx - 1] = num
            initElementIdx -= 1
        }
        return reversedArr
    }