Learned about Inheritance, super() method and prototypal inheritance

03 - Chai aur Javascript/12 - Object Oriented Programming/04_inheritance.js

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+// Parent Class
+class Vehicle{
+
+    // constructor
+    constructor(brand, model){
+        this.brand = brand
+        this.model = model
+
+    }
+
+    // Method in parent class
+    startEngine(){
+        console.log("Engine Started");
+    }
+}
+
+// Child class
+class Car extends Vehicle{
+
+    constructor(brand, model, doors){
+        super(brand, model) // call parent class constructor
+        this.doors = doors
+    }
+
+    // Method in child class
+    honkHorn(){
+        console.log("Beep! Beep!");
+    }
+}
+
+// Creating an instance of the child class
+const myCar = new Car("Toyota", "Fortuner", 4);
+
+myCar.startEngine() // Output: Engine Started
+myCar.honkHorn() // Output: Beep! Beep!
+
+// data dekhte hai
+console.log(`Car Brand Name is ${myCar.brand} and Model Name is ${myCar.model}, Plus it has ${myCar.doors} doors.`)
+
+
+// --------------------------------------------------
+
+// Method Overriding
+
+class Animal{
+    speak(){
+        console.log("Animal Speaks.");
+    }
+}
+
+class Dog extends Animal{
+    // Overriding the speak method
+    speak(){
+        console.log("Bow! Bow!");
+    }
+}
+
+const dog = new Dog();
+
+dog.speak(); // Output: Bow! Bow!
+
+
+// ----------------------------------------------------
+// Prototypal Inheritance
+
+// Parent object
+const vehicle = {
+    startEngine: function(){
+        console.log("Engine Started");
+    }
+}
+
+// Child object
+const car = Object.create(vehicle)
+
+car.honkHorn = function(){
+    console.log("Beep! Beep!");
+}
+
+car.startEngine() // Output: Engine started
+car.honkHorn() // Output: Beep! Beep!