golang

interfaces.go

package main

import (
  "fmt"
  "time"
)

type guestConnection struct {
  ip       string
  userName string
  isAdmin  bool
}

type visitorConnection struct {
  ip       string
  connHour int
}

type notifier interface{
  notify()
}

// one implementation for guestConnection
func (g guestConnection) notify() {
  fmt.Println("Guest connection from user name:", g.userName)
}

// and a different implementation for visitorConnection
func ( v visitorConnection ) notify() {
  fmt.Println("Visitor connected at:", v.connHour)
}

func main() {
  notifiers := getAllConnections()
  for _, c := range notifiers {
    c.notify()
  }

}

func getAllConnections() []notifier {
  gConn := &guestConnection{ip: "192.168.0.10", userName: "Darth Vader"}
  vConn := &visitorConnection{ip: "192.168.0.11", connHour: time.Now().Hour()}

  return []notifier{gConn, vConn}
}

simpleConnection.go

package main

import "fmt"

type guestConnection struct {
  ip string
  userName string
  isAdmin bool
}

func (g guestConnection) notify() {
  fmt.Println("Guest connection from user name:", g.userName)
}

func main() {
  guestConns := getAllConnections()
  for _, c := range guestConns {
    c.notify()
  }
}

func getAllConnections() []*guestConnection {
  gConn1 := &guestConnection{ip: "192.168.0.10", userName: "Darth Vader"}
  gConn2 := &guestConnection{ip: "192.168.0.11", userName: "Obi-Wan"}
  
  return []*guestConnection{gConn1, gConn2}
}