class Animal {

constructor(name) {

this.speed = 0;

this.name = name;

}

run(speed) {

this.speed += speed;

console.log(`${this.name} runs with speed ${this.speed}.`);

}

stop() {

this.speed = 0;

console.log(`${this.name} stands still.`);

}

}

class Rabbit extends Animal {

hide() {

console.log(`${this.name} hides!`);

}

stop() {

super.stop(); // call parent stop

this.hide(); // and then hide

}

}

let rabbit = new Rabbit("White Rabbit");

rabbit.run(5); // White Rabbit runs with speed 5.

rabbit.stop(); // White Rabbit stands still. White rabbit hides!

// Another Example

class Person {

constructor(first, last, age, gender, interests) {

this.name = {

first,

last

};

this.age = age;

this.gender = gender;

this.interests = interests;

}

greeting() {

console.log(`Hi! I'm ${this.name.first}`);

};

farewell() {

console.log(`${this.name.first} has left the building. Bye for now!`);

};

}

class Teacher extends Person {

constructor(first, last, age, gender, interests, subject, grade) {

super(first, last, age, gender, interests);

// subject and grade are specific to Teacher

this._subject = subject;

this.grade = grade;

}

get subject() {

return this._subject;

}

set subject(newSubject) {

this._subject = newSubject;

}

}

let teacher = new Teacher('Lakshman', 'Gope', 21, 'Male', 'Programming', 'Software Engineering', 'A');

console.log(teacher);