given a slice of 52 slots shuffle so that the result has a uniform distribution probability

shuffle.go

package main

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

// given array of 52 slots shuffle so that the result has a uniform distribution probability

var (
	deck     []int
	shuffled []int
)

func Shuffle(deck []int) []int {
	rand.Seed(time.Now().UnixNano())
	for i := len(deck); i > 0; i-- {
		// pick an index
		index := rand.Intn(len(deck))
		// get the value
		newcard := deck[index]
		// Put it in the new deck
		shuffled = append(shuffled, newcard)
		// Remove from the original
		deck = append(deck[:index], deck[index+1:]...)
	}
	return shuffled
}

func main() {
	// Build a deck
	for i := 0; i < 52; i++ {
		deck = append(deck, i)
	}
	fmt.Printf("Unshuffled deck: %v\n", deck)
	shuffled = Shuffle(deck)
	fmt.Printf("%d slots shuffled: %v\n", len(shuffled), shuffled)

}