In Go, interfaces are used for dynamic dispatch. No need to the the whole ".MakeNoise() calls .myNoise()" dance, just implement ".MakeNoise()" on each type directly:

    type Animal interface {
        MakeNoise()
    }

    type Dog struct{}

    func (Dog) MakeNoise() {
        fmt.Println("Woof!")
    }

    type Cat struct{}

    func (Cat) MakeNoise() {
        fmt.Println("Meow.")
    }

    func MakeNoises(as ...Animal) {
        for _, a := range as {
            a.MakeNoise()
        }
    }

    func main() {
        d := Dog{}
        c := Cat{}
        MakeNoises(d, c)
    }