Golang : Implementing class(object-oriented programming style)

If you are used to ways of doing things in Java or C++, such as declaring class and assigning different methods to the class. Golang has a unique way of implementing class with the type interface. This code example below demonstrate how to declare classes and assign methods to the classes.

 package main

 import (
  "fmt"
 )

 type SayHelloIntFace interface {
  SayHello()
 }

 type Person struct{}

 // this method is tied to Person class
 func (person Person) SayHello() {
  fmt.Printf("Hello!")
 }

 type Dog struct{}

 // this method is tied to Dog class
 func (dog Dog) SayHello() {
  fmt.Printf("woof! woof!")
 }

 func greeting(i SayHelloIntFace) {
  i.SayHello()
 }

 func main() {
  // instantiate objects
  person := Person{}
  dog := Dog{}

  var i SayHelloIntFace

  fmt.Println("\nPerson : ")
  i = person
  greeting(i)

  fmt.Println("\n\nDog : ")
  i = dog
  greeting(i)

 }

Output :

Person :

Hello!

Dog :

woof! woof!

Hope you may find this tutorial useful. Good luck in learning and using Golang for developing your website or application!