`class is the blurprint used for object creation.

* class B inherits properties and methods from parent class A.

* And Class B overwrites fun() method.`

class A {

constructor (name, age) {

this.name = name;

this.age = age;

}

fun() {

console.log(`Saying hello to ${this.name}`);

}

}

class B extends A {

constructor (name, age, gender) {

super(name, age);

this.gender = gender;

// this.fun();

}

fun() {

console.log(`Saying hello to ${this.name} from B`);

}

fun2() {

console.log(`Saying hello to ${this.name} from B fun 2`);

}

}

class C extends B {

constructor (name, age, gender, section) {

super(name, age, gender);

// this.name = "fixed";

this.section = section;

}

fun() {

console.log(`Saying hello to ${this.name} from C`);

}

}

let instance = new A("demo", 20);

let instance1 = new B("demo", 20, "male");

let instance2 = new C("Cclass", 11, "abc", "c");

console.log(instance1.name);

console.log(instance1.gender);

instance1.fun();

console.log(instance2.name);

console.log(instance2.gender);

instance2.fun();

instance2.fun2();

console.log(A.prototype);