Prototype Design pattern

 // Prototype interface

class Animal {

constructor(name, species) {

this.name = name;

this.species = species;

}

clone() {

return null;

}

}

// Concrete prototypes

class Dog extends Animal {

constructor(name) {

super(name, "Dog");

}

clone() {

return new Dog(this.name);

}

}

class Cat extends Animal {

constructor(name) {

super(name, "Cat");

}

clone() {

return new Cat(this.name);

}

}

// Client

const originalDog = new Dog("Buddy");

const clonedDog = originalDog.clone();

console.log(originalDog); // Dog { name: 'Buddy', species: 'Dog' }

console.log(clonedDog); // Dog { name: 'Buddy', species: 'Dog' }