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go tour interface exercise stringers
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| package main | |
| import ( | |
| "fmt" | |
| "strconv" | |
| "strings" | |
| ) | |
| type IPAddr [4]byte | |
| // TODO: Add a "String() string" method to IPAddr. | |
| func (ip IPAddr) String() string { | |
| var r []string | |
| for _, v := range [4]byte(ip) { | |
| p := strconv.Itoa(int(v)) | |
| r = append(r, p) | |
| } | |
| return strings.Join(r, ".") | |
| } | |
| 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) | |
| } | |
| } |
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