Go tour练习：Stringer

本篇是”Go 语言之旅”中的Stringer练习的学习记录。

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通过让 IPAddr 类型实现 fmt.Stringer 来打印点号分隔的地址。

例如，IPAddr{1, 2, 3, 4} 应当打印为 "1.2.3.4"。

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package main

import "fmt"

type IPAddr [4]byte

func (ip IPAddr) String() string{
	return fmt.Sprintf("%d.%d.%d.%d", 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)
	}
}