? Class Inheritance in JavaScript

Inheritance allows one class (child) to inherit properties and methods from another class (parent), promoting code reuse and organization.

? Basic Syntax: ES6 Classes and Inheritance

// Parent classclass Animal {  constructor(name) {    this.name = name;  }  speak() {    console.log(`${this.name} makes a sound.`);  }}// Child class extends Animalclass Dog extends Animal {  constructor(name, breed) {    super(name);           // Call parent constructor    this.breed = breed;  }  speak() {    console.log(`${this.name} barks.`);  }}const dog = new Dog("Buddy", "Golden Retriever");dog.speak(); // Output: Buddy barks.

? Explanation

• class Dog extends Animal — Dog inherits from Animal

• super(name) — calls the constructor of the parent class

• Child class can override parent methods (speak in example)

• Child class can add new properties or methods

? More Features

1. Calling Parent Methods From Child

class Cat extends Animal {  speak() {    super.speak(); // Calls Animal's speak()    console.log(`${this.name} meows.`);  }}const cat = new Cat("Whiskers");cat.speak();// Output:// Whiskers makes a sound.// Whiskers meows.

2. Inheriting Without Adding Anything

class Bird extends Animal {}const bird = new Bird("Tweety");bird.speak();  // Tweety makes a sound.

? Why Use Class Inheritance?

• Code reuse

• Logical grouping of similar objects

• Easier maintenance

• Polymorphism (overriding methods)

?? Notes

• JavaScript uses prototype-based inheritance under the hood.

• ES6 class syntax is mostly syntactic sugar over prototypes.

• You can also create inheritance using constructor functions and prototypes (older style).

If you want, I can also show you prototype-based inheritance or examples with multiple levels of inheritance. Just ask!