Golang : How to reverse slice or array elements order

In this short tutorial, we will learn how to reverse the elements order inside a slice or array. Taking the example from a previous tutorial on how to reverse elements order in a map, we will reverse the elements order by

 1. calculating the total length of the slice.

 2. deduct 1 position. 

 3. then deduct the current element position to get the last element.

 4. finally, append the last element into a new slice with reversed order.

Here you go!

 package main

 import "fmt"

 func main() {

 cities := [...]string{"New York", "Beijing", "Bangkok", "Adelaide", "Tokyo", "Seoul", "Zurich", "Seattle"}

 fmt.Println("Before : ", cities)

 reversed := []string{}

 // reverse order
 // and append into new slice
 for i := range cities {
 n := cities[len(cities)-1-i]
 //fmt.Println(n) -- sanity check
 reversed = append(reversed, n)
 }

 fmt.Println("After : ", reversed)

 }

Output :

Before : [New York Beijing Bangkok Adelaide Tokyo Seoul Zurich Seattle]

After : [Seattle Zurich Seoul Tokyo Adelaide Bangkok Beijing New York]