Object-Oriented Programming in JavaScript

JavaScript is a versatile programming language that supports object-oriented programming (OOP) concepts. OOP is a programming paradigm that focuses on creating objects that contain both data and behavior.

In JavaScript, objects can be created using classes. A class is a blueprint for creating objects with a specific structure and behavior. Let's look at an example of creating a class and using it to create objects:

1import React from 'react';
2
3// Define a class
4class Rectangle {
5  constructor(width, height) {
6    this.width = width;
7    this.height = height;
8  }
9
10  // Define an accessor property
11  get area() {
12    return this.width * this.height;
13  }
14
15  // Define a setter property
16  set area(value) {
17    this.width = Math.sqrt(value);
18    this.height = Math.sqrt(value);
19  }
20}
21
22// Create an object using the class
23const rect = new Rectangle(5, 10);
24console.log(rect.area); // Output: 50
25
26rect.area = 64;
27console.log(rect.width); // Output: 8
28console.log(rect.height); // Output: 8

In this example, we define a Rectangle class that has a constructor method to initialize the width and height properties.

We also have an accessor property area, which calculates the area of the rectangle based on the width and height properties. The get accessor allows us to retrieve the value of the property, while the set accessor allows us to modify the value of the property.

We create an instance of the Rectangle class using the new keyword and pass the initial values for the width and height properties. We can then access the area property to calculate the area of the rectangle. We can also modify the area property, which in turn updates the width and height properties.

Object-oriented programming provides a way to structure code, organize data, and encapsulate functionality. It allows for the creation of reusable and modular code, making it easier to maintain and extend applications.

By leveraging object-oriented programming concepts in JavaScript, you can build complex applications with ease and take advantage of JavaScript's versatility in various domains.

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import React from 'react';

​

class Rectangle {

  constructor(width, height) {

    this.width = width;

    this.height = height;

  }

​

  get area() {

    return this.width * this.height;

  }

​

  set area(value) {

    this.width = Math.sqrt(value);

    this.height = Math.sqrt(value);

  }

}

​

const rect = new Rectangle(5, 10);

console.log(rect.area); // Output: 50

rect.area = 64;

console.log(rect.width); // Output: 8

console.log(rect.height); // Output: 8