go-learning/tour_of_go/l5/exercise-stringer.go

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2025-08-31 16:38:50 +00:00
package main
import "fmt"
type IPAddr [4]byte
func (i IPAddr) String() string {
return fmt.Sprintf("%d.%d.%d.%d", i[0], i[1], i[2], i[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)
}
}