Rotate Array in Swift

Question

While exploring algorithms in Swift, couldn\'t find algorithm for array rotation in swift without using funcs shiftLeft / shiftRight.

C has

Answer 1

This solution rotates the element of time complexity O(n)

func rotLeft(a: [Int], d: Int) -> [Int] {
   var arr = a
   var size = arr.count - 1
   for i in 0...size  {
     let newloc = (i + (arr.count - d)) % arr.count
     arr[newloc] = a[i]
   }
   return arr
}

you shouldn't use .append(x) as in the worst case it can be O(n) and you shouldn't use .remove(at: x) as its O(n) when you can avoid using those methods As when using them you basically get n + n + n which isn't that great