ランダムで4桁の16進数を生成します

random4Letters0x.go

package main

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

const letters = "0123456789ABCDEF"

func main() {
	fmt.Println(RandString(4))
}


func RandString(length int) string {
	rand.Seed(time.Now().UnixNano())

	b := make([]byte, length)

	for i := range b {
		b[i] = letters[int(rand.Int63()%int64(len(letters)))]
	}

	return string(b)
}