Hackforge Academy

Explanation

OOPS (Object-Oriented Programming System) in JavaScript is a programming paradigm based on objects and classes. The four main principles are Encapsulation, Inheritance, Polymorphism, and Abstraction.

Code:

class Car {
  constructor(brand) {
    this.brand = brand;
  }

  display() {
    console.log(`Brand: ${this.brand}`);
  }
}

const car = new Car('Toyota');
car.display();

Explanation

Encapsulation is the process of bundling data and methods within a class and controlling access to internal data.

Code:

class Employee {
  #name;

  setName(name) {
    this.#name = name;
  }

  getName() {
    return this.#name;
  }
}

const emp = new Employee();
emp.setName('John');
console.log(emp.getName());

Explanation

Inheritance allows a class to inherit properties and methods from another class, promoting code reuse.

Code:

class Animal {
  sound() {
    console.log('Animal makes a sound');
  }
}

class Dog extends Animal {
  bark() {
    console.log('Dog barks');
  }
}

const dog = new Dog();
dog.sound();
dog.bark();

Explanation

Polymorphism allows the same method to behave differently depending on the object that invokes it.

Code:

class Animal {
  sound() {
    console.log('Animal sound');
  }
}

class Dog extends Animal {
  sound() {
    console.log('Dog barks');
  }
}

const animal = new Dog();
animal.sound();

Explanation

Abstraction hides implementation details and exposes only the necessary functionality to the user.

Code:

class Shape {
  draw() {
    throw new Error('draw() method must 
be implemented');
  }
}

class Circle extends Shape {
  draw() {
    console.log('Drawing Circle');
  }
}

const shape = new Circle();
shape.draw();