new js program

Javascript/program-15/program.js

@@ -0,0 +1,57 @@
+`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);