Implementation of the exercise: Stringers in “A Tour of Go”

Source: https://www.webafrica.co.za/blog/wp-content/uploads/2015/10/ip-address.jpg

When you begin to learn the trending Go lang you may have encounter with the Stringer exercise to print IP addresses in dotted format. Here is how I implemented it.

package main
import "fmt"
type IPAddr [4]byte
// if we implement this , this will get called when printing //IPAddr
func (ip IPAddr) String() string{
  return fmt.Sprintf("%v.%v.%v.%v",ip[0],ip[1],ip[2],ip[3]) 
}
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)
 }
}