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class Animal {
    constructor(name, voice = "says") {
        this._name = name;
        this._voice = voice;
    }

    speak(phrase) {
        return `${this._name} ${this._voice} ${phrase}.`;
    }
}

class Human extends Animal {
    constructor(name) {
        super(name);
    }

    speak() {
        console.log(super.speak("nothing"));
    }
}

class Cat extends Animal {
    constructor(name) {
        super(name, 'meows');
    }

    speak() {
        console.log(super.speak("hello"));
    }
}

class Dog extends Animal {
    constructor(name) {
        super(name, 'woofs');
    }

    speak() {
        console.log(super.speak("goodbye"));
    }
}

const fred = new Human('Fred');
const fluffy = new Cat('Fluffy');
const fido = new Dog('Fido');

[fred, fluffy, fido].forEach(animal => animal.speak());