Observer pattern - golang

interface.go

type TestCallBack struct {
  
}

func (c *TestCallBack) Exec(o *Observable) {
  log.Println(o.Name)
}

type Callback interface {
	Exec(h *Observable)
}

main.go

package main
 
import (
  "log"
)

 
type Observable struct {
	Name string
}
 
type TestCallBack struct {
  
}
 
func (c *TestCallBack) Exec(o *Observable) {
  log.Println(o.Name)
}
 
type Callback interface {
	Exec(h *Observable)
}
 
type Observer struct {
	callbacks []Callback
}
 
func (o *Observer) Add(c Callback) {
	o.callbacks = append(o.callbacks, c)
}
 
func (o *Observer) Process(oe *Observable) {
	for _, c := range o.callbacks {
		c.Exec(oe)
	}
}
 
func main() {
  oe := Observable{Name: "Hello World"}
  o := Observer{}
  o.Add(&TestCallBack{})
  o.Process(&oe)
}

observer.go

type Observer struct {
	callbacks []Callback
}
 
func (o *Observer) Add(c Callback) {
	o.callbacks = append(o.callbacks, c)
}
 
func (o *Observer) Process(oe *Observable) {
	for _, c := range o.callbacks {
		c.Exec(oe)
	}
}