mkock

type myError struct{}

func (m *myError) Error() string {
	return "failure"
}

func doSomething() (string, error) {
	return "", nil
}

mkock

type speaker interface {
	speak() string
}

type cat struct{}

func (c *cat) speak() string { return "Miau!" }

type dog struct{}

mkock

type player struct {
	// unexported fields
}

func (p *player) status() string {
	return "Player is eating"
}

func (p *player) sleep() {
	// implementation goes here

mkock

type sword struct {}

func (s *sword) status() string {
	return "Sword is damaged"
}

mkock

type equippable interface{
	equip()
	unequip()
}

type meleeWeapon interface {
	equippable // Embeds equippable
	slash()
}

mkock

type car struct {}

func (c *car) start() { return }
func (c *car) stop() { return }

type vehicle interface {
	start()
	stop()
}

mkock

type car struct {}

func (c *car) start() { return }
func (c *car) stop() { return }
func (c *car) recycle() { fmt.Println("Recycling...") }

type vehicle interface {
	start()
	stop()
}

mkock

type car struct {}

func (c *car) start() { return }
func (c *car) stop() { return }
func (c *car) recycle() { return }
func (c *car) convertToBatMobile() { fmt.Println("I am now a BatMobile!") }

type vehicle interface {
	start()
	stop()

mkock

type movie string

func (m movie) Movie() string { return string(m) }

type movieStar string

func (m movieStar) Star() string { return string(m) }

func movieOrStar(m interface{}) string {
	switch v := m.(type) {

mkock

type persona interface {
	strength() int
	intelligence() int
	stamina() int
}

type dwarf struct {}
func (d *dwarf) strength() int { return 80 }
func (d *dwarf) intelligence() int { return 55 }
func (d *dwarf) stamina() int { return 90 }