Left Rotate an Array by One

Input: arr[] = {11, 22, 33, 44, 55}
Output: arr[] = {22, 33, 44, 55, 11}

Input: arr[] = {50, 3, 22}
Output: arr[] = {3, 22, 50}

package main

import (
    "fmt"
)

func main() {
    // arr := []int{11, 22, 33, 44, 55} // [22 33 44 55 11]
    arr := []int{50, 3, 22} // [3 22 50]
    leftRotateOne(arr)
    fmt.Println(arr)
}

func leftRotateOne(arr []int) {
    temp := arr[0]
    for i := 1; i < len(arr); i++ {
        arr[i-1] = arr[i]
    }
    arr[len(arr)-1] = temp
}

Time Complexity: θ(n) Space Complexity: θ(1)