go tour exercise (methods/18)

exercise-stringers.go

package main

import (
	"fmt"
	"strconv"
	"strings"
)

type IPAddr [4]byte

func (ip IPAddr) String() string {
	var s []string
    for _, i := range ip {
        s = append(s, strconv.Itoa(int(i)))
    }
    return strings.Join(s, ".")
} 

func main() {
	hosts := map[string]IPAddr{
		"loopback":  {127, 0, 0, 1},
		"googleDNS": {8, 8, 8, 8},
	}
	for name, ip := range hosts {
		fmt.Printf("%v: %v\n", name, ip)
	}
}