SOLID: prinsip liskov

sebelum_refactor.go

package main

import "fmt"

type A struct{}

func (a A) Test() {
	fmt.Println("Printing A")
}

type B struct {
	A
}

func ImpossibleLiskovSubstitution(a A) {
	a.Test()
}

func main() {
	a := B{}
	// PANIC : cannot use a (type B) as
	// type A in argument to
	// ImpossibleLiskovSubstitution
	ImpossibleLiskovSubstitution(a)
}

setelah_refactor.go

package main

import "fmt"

type A struct{}

func (a A) Test() {
	fmt.Println("Printing A")
}

type B struct {
	A
}

type testing interface {
	Test()
}

func PossibleLiskovSubstitution(a testing) {
	a.Test()
}
func main() {
	a := B{}
	PossibleLiskovSubstitution(a)
}