[A Tour of Go] Exercise: Stringers

exercise-stringer.go

package main

import "fmt"
import "strings"

type IPAddr [4]byte

func (a IPAddr) String() string {
	tmp := make([]string, 4, 4)
	for i, v := range a {
		tmp[i] = int(v).String()
	}
	return strings.Join(tmp, ".")
}

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)
	}
}