Thursday, December 03, 2015

Golang Exercise: Stringers

package main

import "fmt"

type IPAddr [4]byte

// TODO: Add a "String() string" method to IPAddr.
func (ip IPAddr) String() string {
 var ls_ip string
 for i, value := range ip {
  //ls_ip = ls_ip + string(i) + ":" + string(int(value)) + "."
  switch {
  case i == 0:
   ls_ip = fmt.Sprintf("%v", value)
  default:
   ls_ip = fmt.Sprintf("%v.%v", ls_ip, value)
  }
 }
 return ls_ip
}


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



Output:

loopback: 127.0.0.1
googleDNS: 8.8.8.8

Program exited.

Reference:

http://tour.golang.org/methods/7
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