Lecture 207:- Inheritance Using Classes

Inheritance is a key concept in object-oriented programming that allows us to create new objects with properties of an existing object. In JavaScript, inheritance can be achieved using classes. A class is essentially a blueprint for creating objects. We can define properties and methods in a class, and then use that class to create new objects.

To create a subclass that inherits properties and methods from a superclass, we can use the extends keyword. Here's an example:

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class Animal {  constructor(name) {    this.name = name;  }    speak() {    console.log(`${this.name} makes a noise.`);  } } class Dog extends Animal {  constructor(name) {    super(name); // call the superclass constructor  }  speak() {    console.log(`${this.name} barks.`);  } } let d = new Dog('Mitzie'); d.speak(); // output: "Mitzie barks."

In this example, we define a superclass Animal and a subclass Dog that extends Animal. The Dog class inherits the name property and the speak method from Animal. We also define a speak method in Dog that overrides the speak method in Animal. We create a new Dog object and call the speak method, which outputs "Mitzie barks.".

By using inheritance, we can avoid code duplication and make our code more modular and maintainable.