Introduction to JavaScript Libraries and Frameworks in 2023

In the previous chapter, we covered topics of JavaScript such as closures, prototypes, and the Document Object Model (DOM). In this tutorial, we would explore popular JavaScript libraries and frameworks such as jQuery, React, and Angular. We would also cover how to use these tools to build complex web applications.

Introduction to JavaScript Libraries and Frameworks

JavaScript libraries and frameworks are pre-written code that helps developers quickly and easily build complex web applications. They provide a set of functionalities and features that make it easier to handle complex tasks in a more efficient and organized manner. The use of libraries and frameworks has become increasingly popular in recent years and has changed the way web applications are developed.

ALSO READ: Complete JavaScript course by Mohit Chaprana

jQuery

jQuery is one of the most popular JavaScript libraries and has been around for over a decade. It was created to make it easier for developers to manipulate HTML documents and handle events in a cross-browser compatible manner. jQuery provides a simple and clean API that makes it easy to handle a wide range of tasks, including animation, AJAX, and event handling.

Here is an example of using jQuery to handle an event in a web page:

$(document).ready(function() {
  $('button').click(function() {
    alert('Button clicked');
  });
});

In this example, the $ symbol is used to call the jQuery function and select elements in the HTML document. The click method is used to handle the click event on the button.

jQuery has a huge community of developers and has a vast library of plugins and extensions that can be used to add additional functionality to your web application.

React

React is a JavaScript library for building user interfaces. It was developed and is maintained by Facebook and has become one of the most popular frameworks for building web applications. React uses a virtual DOM (Document Object Model) to update the view without the need for a full page refresh. This makes React apps fast, scalable, and responsive.

Here is an example of a React component:

import React, { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>
        Increment
      </button>
    </div>
  );
}

export default Counter;

In this example, the Counter component displays the current count and a button that increments the count. The useState hook is used to manage the state of the component and update the view whenever the state changes.

Angular

Angular is a full-featured framework for building web applications. It provides a set of tools for building complex and dynamic web applications, including two-way data binding, templates, and a modular architecture. Angular uses TypeScript, a statically typed language that is a superset of JavaScript, which makes it easier to write and maintain large-scale applications.

ALSO READ: Complete JavaScript course by Mohit Chaprana

Here is an example of an Angular component:

import { Component } from '@angular/core'; @Component({   selector: 'app-counter',   template: `     <p>Count: {{count}}</p>     <button (click)="increment()">Increment</button>   ` }) export class 
  CounterComponent {   count = 0;   increment() {     this.count++;   } } 

In this example, the CounterComponent displays the current count and a button that increments the count. The @Component decorator is used to define the component and its template. The count property

is used to store the current count and the increment() method is used to update the count whenever the button is clicked.

ALSO READ: Complete JavaScript course by Mohit Chaprana

Choosing the Right Library or Framework

The choice of library or framework will depend on the specific requirements of your project. If you are building a simple website, jQuery may be sufficient. If you are building a complex and dynamic web application, a framework like Angular or React may be more appropriate.

Ultimately, the choice of library or framework will come down to personal preference and experience. It is important to try out different options and find what works best for you and your project.

Conclusion

In this tutorial, we have explored the popular JavaScript libraries and frameworks of jQuery, React, and Angular. These tools have changed the way web applications are developed and make it easier to build complex and dynamic web applications. Understanding the basics of these libraries and frameworks is an important step in becoming a skilled JavaScript developer.

ALSO READ: Complete JavaScript course by Mohit Chaprana