How to shuffle the elements of a slice randomly in Golang?

To shuffle the elements of a slice randomly in Golang, you can use the math/rand package. Here's an example:

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func shuffle(slice []int) {
	rand.Seed(time.Now().UnixNano())
	rand.Shuffle(len(slice), func(i, j int) { slice[i], slice[j] = slice[j], slice[i] })
}

func main() {
	slice := []int{1, 2, 3, 4, 5}
	fmt.Println("Before shuffle:", slice)
	
	shuffle(slice)
	fmt.Println("After shuffle:", slice)
}

In this example:

The shuffle function takes a slice of integers as input.
We seed the random number generator using rand.Seed with the current time in nanoseconds.
We call rand.Shuffle on the length of the slice, passing a custom swap function that swaps the elements at indices i and j in the slice.
In the main function, we create a slice of integers, print it before shuffling, shuffle it using the shuffle function, and then print it again after shuffling.