go tour --Exercise: Stringers

package main

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


type IPAddr [4]byte

func (ip IPAddr) String() string{
	array := make([]string, len(ip))
	for i, b := range ip {
		array[i] = strconv.Itoa(int(b))
	}
	return strings.Join(array, ".")
}

// TODO: Add a "String() string" method to IPAddr.

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)
	}
}

// ================================================
loopback: 127.0.0.1
googleDNS: 8.8.8.8