How to reverse a string in Go

Created Apr 8, 2022 at 12:04

Modified Apr 8, 2022 at 12:09

Using range

a range on a string returns a rune which is a codepoint.

package main

import "fmt"

func Reverse(s string) (result string) {
  for _, v := range s {
    result = string(v) + result
  }
  return
}

func main() {

  // !olleH
  s := Reverse("Hello!")
  fmt.Println(s)

  // 界世,olleH
  s = Reverse("Hello,世界")
  fmt.Println(s)
}

!olleH
界世,olleH

Swapping the Letters

Reverse the string by swapping the letters.

package main

import "fmt"

func Reverse(s string) string {
  r := []rune(s)
  for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
    r[i], r[j] = r[j], r[i]
  }

  return string(r)
}

func main() {

  // !olleH
  s := Reverse("Hello!")
  fmt.Println(s)

  // 界世,olleH
  s = Reverse("Hello,世界")
  fmt.Println(s)
}