ES6 Class Inheritance

es6-class.js

class Animal {
    constructor(name, weight) {
        this.name = name;
        this.weight = weight;
    }
    
    eat() {
        return `${this.name} is eating`;
    }
    
    sleep() {
        return `${this.name} is going to sleep`;
    }
}

class Dog extends Animal{
    constructor(name, weight, sex) {
        super(name, weight);
        this.sex = sex;
    }
    
    run() {
        return `${this.name} is running`;
    }
    
    eatBone() {
        return `${super.eat()} bone`;
    }
}

const dog = new Dog("Kem", "2kg");
console.log(dog.sleep());
console.log(dog.run());
console.log(dog.eatBone());