go snippet: Using the rand package to randomize access to a slice.

gistfile1.txt

package main

import (
	"fmt"
	"rand"
	"time"
)

func main() {
	a := []int64{0, 1, 2, 3, 4, 5, 6}

        // Before using the pseudo-number generator we have to initialize it with a seed.
        // A simple way is to use the last digits of the current UNIX timestamp in nanoseconds.
	rand.Seed(time.Nanoseconds() % 1e9)

	for _, i := range rand.Perm(len(a)) {
		fmt.Println(a[i])
	}
}