React is a robust JavaScript library for creating dynamic and interactive user interfaces (UIs). Developed by Facebook, React is renowned for its component-based architecture, which enables the creation of reusable UI elements, simplifying the management and maintenance of complex web applications. It is commonly used to develop single-page applications.

In this React tutorial, you’ll learn all the basic to advanced concepts of React such as React components, React props, React state, Functional components in React, React hooks, etc.

‍ What is React ?

This is a JavaScript library for building user interfaces (UIs) on the web. React is a declarative, component based library that allows developers to build reusable UI components and It follows the Virtual DOM (Document Object Model) approach, which optimizes rendering performance by minimizing DOM updates. React is fast and works well with other tools and libraries.

Tutorial Prerequisites:

• HTML
• CSS
• JavaScript

Table of Content

• Getting Started with React: Installation and Environment Setup
• Why Learn React JS?
• Features of React
• Core React Concepts
• React Advantages

Getting Started with React: Installation and Environment Setup

Before embarking on your React journey, ensure you have a suitable development environment set up. Here’s a roadmap to get you started:

1. Node.js and npm: Download and install Node.js (https://nodejs.org/en/download/package-manager/current) as it provides the runtime environment for JavaScript code execution. npm (Node Package Manager) is bundled with Node.js and is used to manage project dependencies.
2. Create React App (CRA): Using Create React App (CRA) to establish a new React project with minimal configuration. Run npx create-react-app my-react-app in your terminal, replacing my-react-app with your desired project name.

Basic Example of React:

ReactJS

import React from ‘react’;

import ReactDOM from ‘react-dom/client’;

function Hello(props) {

  return <h1>Hello GeeksforGeeks</h1>;

}

const container = document.getElementById(“root”);

const root = ReactDOM.createRoot(container);

root.render(<Hello />);

This code defines a functional component named App that returns JSX code displaying the text “Hello GeeksforGeeks”. Save the file and run your development server using npm start. Navigate to http://localhost:3000/ in your browser to view your webpage.

Why Learn React JS?

React, the popular JavaScript library, offers several exciting reasons for developers to learn it.

First, React is flexible – once you learn its concepts, you can use it across various platforms to build quality user interfaces. Unlike a framework, React’s library approach allows it to evolve into a remarkable tool.

Second, React has a great developer experience, making it easier to understand and write code. Third, it benefits from Facebook’s support and resources, ensuring regular bug fixes, enhancements, and documentation updates. Additionally, React’s broader community support, excellent performance, and ease of testing make it an ideal choice for web development.

Features of React

1. JSX (JavaScript Syntax Extension):

• JSX combines HTML and JavaScript, allowing you to embed JavaScript objects within HTML elements.
• It enhances code readability and simplifies UI development.

Example:

const name = “GeeksforGeeks”;

const ele = <h1>Welcome to {name}</h1>;

2. Virtual DOM (Document Object Model):

• React uses a virtual DOM, which is an exact copy of the real DOM.
• When there are modifications in the web application, React updates the virtual DOM first and then computes the differences between the real DOM and the virtual DOM.
• This approach minimizes unnecessary re-rendering and improves performance.

3. One-way Data Binding:

• React follows one-way data binding, where data flows from parent components to child components.
• Child components cannot directly return data to their parent components, but they can communicate with parents to modify states based on provided inputs.

4. Performance:

• React’s virtual DOM and component-based architecture contribute to better performance.
• Separate components allow efficient rendering and faster execution.

5. Extension:

• React has a rich ecosystem and supports various extensions.
• Explore tools like Flux, Redux, and React Native for mobile app development and server-side rendering.

6. Conditional Statements in JSX:

• JSX allows writing conditional statements directly.
• Display data in the browser based on provided conditions.

Example:

const age = 12;

if (age >= 10) {

 return <p>Greater than {age}</p>;

} else {

 return <p>{age}</p>;

}

7. Components:

• React divides web pages into reusable and immutable components.
• Component-based development simplifies code organization and maintenance.

Core React Concepts

here are some essential concepts to learn:

• Props: Components can receive data from parent components through props, enabling you to pass information and customize component behavior.
• State: Components can manage their internal state using the useState hook. This state dictates the component’s appearance and behavior, and updates trigger re-renders.
• Lifecycle Methods: React provides lifecycle methods like componentDidMount and componentDidUpdate that allow you to perform actions at specific stages of a component’s lifecycle.
• Conditional Rendering: Control what gets displayed on the screen based on certain conditions using conditional statements within JSX.

React Advantages

• Composable: We can divide these codes and put them in custom components. Then we can utilize those components and integrate them into one place.
• Declarative: In ReactJS, the DOM is declarative. We can make interactive UIs by changing the state of the component and ReactJS takes care of updating the DOM according to it.
• SEO Friendly: ReactJS affects the SEO by giving you a SPA (Single Page Application) which requires Javascript to show the content on the page which can be rendered and indexed.
• Community: ReactJS has a huge community because of its demand. Each company wants to work with ReactJS. Companies like Meta, Netflix, etc built on ReactJS.
• Easy to learn: HTML-like syntax of JSX makes you comfortable with the codes of React, it only requires a basic knowledge of HTML, CSS, and JS fundamentals to start working with it.
• If you want to learn more refer to this article React JS Advantages
• Debugging is Easy: The debugging of ReactJS is unidirectional which means while designing any app using ReactJS the child components are nested within parent components. So, the data flow is in a single direction so it gets easier to debug errors.

Frequently Asked Questions on React

1. What is React used for?

The primary goal of React is to create a User Interface, Single-Page Application, Progressive Web Application and more.

2. Which language is used in React?

React uses Javascript programming language.

3. Is React a front-end language?

React is globally used for Front-end JS framework and it is popular with both software and project sponsors.

4. Which is in demand: ReactJS or AngularJS in 2024?

React is far more popular than AngularJS because ReactJS comes with more libraries.

5. Which is better NodeJS or ReactJS or AngularJS

Choosing the framework always depends very much on your requirements. All of these three frameworks are quite popular, and users choose them based on what they want to do. But if we do so more specifically, then ReactJS is better.

6. Is this ReactJS tutorial for beginners or for advanced

As we said at the beginning of this article, this course is for beginners as well as for advanced. 

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