Inheritance in JavaScript

JsClassInerhitance.js

class Animal {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  eats() {
    console.log(this.name + ' eats');
  }
}

class Dog extends Animal {
  constructor(name, age, breed) {
    super(name, age);
    this.breed = breed;
  }

  logBreed() {
    console.log(this.name + ' breed is ' + this.breed);
  }
}

console.dir(Animal);
console.dir(Dog);

let cow = new Animal('Passomba', 1);
let dober = new Dog('Dober', 2, 'Doberman');
cow.eats();
dober.logBreed();
dober.eats();
console.dir(cow);
console.dir(dober);

JsPrototypicalInheritance.js

//PROTOTYPICAL INHERITANCE
function Animal(name, age) {
  this.name = name;
  this.age = age;
}
Animal.prototype.eats = function () {
  console.log(this.name + ' eats');
};

function Dog(name, age, breed) {
  Animal.call(this, name, age);
  this.breed = breed;
}
//Both syntaxes are valid
Dog.prototype = Object.create(Animal.prototype);
// Dog.prototype = new Animal();
Dog.prototype.logBreed = function () {
  console.log(this.name + ' breed is ' + this.breed);
};
console.dir(Animal);
console.dir(Dog);

let cow = new Animal('Pasoomba', 1);
let dober = new Dog('Dottie', 2, 'Doberman');
console.dir(cow);
console.dir(dober);
console.log(dober.eats());
console.log(dober.logBreed());