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

To be complete, the rotation function should support negative (right) rotations and rotating more than the array's size

extension Array 
{
    mutating func rotateLeft(by rotations:Int) 
    { 
       // rotation irrelevant when less than 2 elements
       if count < 2 { return }  

       // effective left rotation for negative and > count
       let rotations = (rotations%count + count) % count 

       // no use rotating by zero
       if rotations == 0 { return } 

       // rotate
       (1..