Class Inheritance in JavaScript | ECMAScript 2015 (ES6) #49 @Everyday-Be-Coding

In ES6 (ECMAScript 2015) and later versions of JavaScript, the class syntax was introduced, which provides a more familiar and convenient way to work with inheritance compared to the prototype-based inheritance model. The class syntax simplifies the creation of constructor functions and managing prototypes, making it easier to implement inheritance in JavaScript.

Here's an overview of how inheritance works using the class syntax in ES6:

Class Declarations: In ES6, you can use the class keyword to declare a new class. A class declaration consists of a class name and a class body, which contains methods and properties.
javascript
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class Animal {
constructor(name) {
}

speak() {
}
}
Constructor Method: The constructor method is a special method that is called when an instance of the class is created. It is used to initialize object properties.

Class Inheritance: You can use the extends keyword to create a subclass (child class) that inherits from another class (parent class). The subclass inherits all properties and methods from the parent class.
javascript
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class Dog extends Animal {
constructor(name, breed) {
super(name); // Call the parent constructor
}

speak() {
}
}
Super Keyword: Within the constructor of a subclass, you can use the super keyword to call the constructor of the parent class. This is necessary to initialize properties defined in the parent class.

Method Overriding: Subclasses can override methods defined in the parent class by redefining them in the subclass. When a method is called on an instance of the subclass, JavaScript first checks if the method exists in the subclass. If not, it looks for the method in the parent class.

Here's a complete example demonstrating inheritance using ES6 classes:

javascript
Copy code
class Animal {
constructor(name) {
}

speak() {
}
}

class Dog extends Animal {
constructor(name, breed) {
super(name); // Call the parent constructor
}

speak() {
}
}

const myDog = new Dog('Max', 'Labrador');
In this example, Dog is a subclass of Animal, and Dog instances inherit the speak() method from the Animal class. The super keyword is used to call the constructor of the Animal class within the Dog constructor.

JavaScript
Programming
Web Development
Class-based Inheritance
Object-Oriented Programming
JavaScript Classes
ES6 Classes
JavaScript Inheritance
JavaScript Objects
JavaScript Basics
JavaScript Concepts
Coding
Software Development
JavaScript Tutorial
JavaScript Language
JavaScript Development
JavaScript Learning
JavaScript Explained
JavaScript for Beginners
JavaScript Advanced

Chapter :
00:00 Introduction to class Inheritance
00:32 How Inheritance work using class Syntax
02:07 Example Demonstrating Inheritance
02:25 Summery

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