React Tutorial
React is a JavaScript Library known for front-end development (or user interface). It is popular due to its component-based architecture, Single Page Applications (SPAs) and Virtual DOM for building web applications that are fast, efficient, and scalable.
- Applications are built using reusable components that enable the reload of only the changed part of the UI. Hence we get a better user experience with React.
- Allows you to describe how the UI should look based on the state of your application.
- Uses a virtual DOM to optimize updates, making applications faster and more efficient.
- Enforces a one-way data flow, making the application predictable and easier to debug.
- It uses JSX which combines HTML-like syntax with JavaScript's functionality, making it easy to shift to React from JavaScript.
To Start with React you need to install it in your project. Follow these articles to install depending on your system
Let us now take a look at our first code example.
import React from 'react';
function App() {
return (
<div>
<h1>Welcome To React Tutorial</h1>
</div>
);
}
export default App;
It will print 'Welcome To React Tutorial' in the Browser.
- JSX looks like HTML but is JavaScript. <div> and <h1> are React elements created under the hood.
- Every tag in JSX (like <h1> or <div>) must be properly closed, including self-closing ones like <img />.
- All returned elements must be inside one parent (e.g., the <div> here).
- App is a function that returns the UI. It’s exported so it can be used elsewhere.
- import React from 'react'; is required to use JSX, as JSX is transformed into JavaScript using React.
Why Learn React JS?
React, the popular JavaScript library, offers several exciting reasons for developers to learn it.
- Flexibility: React allows you to build high-quality user interfaces across different platforms, thanks to its flexible library approach.
- Great Developer Experience: React makes it easier to write and understand code, offering a smooth development process.
- Strong Support from Facebook: Regular updates, bug fixes, and resources from Facebook ensure React stays up-to-date and reliable.
- Vast Community Support: React benefits from a large community, providing enough resources, tutorials, and troubleshooting help.
- Excellent Performance: React’s efficient Virtual DOM ensures fast rendering and high performance for web applications.
- Easy Testing: React’s structure and tools make testing simpler, improving code reliability and maintainability.
One of the most effective ways to solidify your understanding is through practical application. That's where structured learning comes into play. For those looking to deepen their React skills and progress from beginner to advanced levels, consider enrolling in the course on React JS: Beginner to Advanced offered by GeeksforGeeks. This comprehensive course provides hands-on projects and real-world applications, making it an excellent resource for anyone serious about mastering React.
React Tutorial Prerequisites: HTML, CSS and JavaScript
React Basic Concepts
Introduction to the Fundamentals of React form importing, exporting modules, creating components, to managing data flow and rendering UI across the application.
- Introduction
- Import and Export
- JSX Introduction
- Components
- Conditional Rendering
- PropTypes
- Prop Drilling
- React Lists
- Context API
- React Redux
React Hooks
Different hooks to access and mange state and lifecycle in functional components.
React DOM Events
Handle DOM events in react like mouse, keyboard and form events.
- React Events Introduction
- onclickcapture Event
- onMouseDown Event
- onDoubleClick Event
- onSubmit Event
- onScroll Event
- onBlur Event
Lifecycle of Components
The lifecycle of react components from creation, mounting and unmounting to manage the different phases.
- Introduction to lifecycle of components
- constructor
- render
- componentDidMount
- componentWillUnmount
- componentDidCatch
- componentDidUpdate
- shouldComponentUpdate
Routing in React
Manage navigation and routing within the single page application.
- React JS Router
- What is react-router-dom?
- React JS Types of Routers
- React-Router Hooks
- Learn Navigation and Routing in React Apps
- Link and NavLink components in React-Router-Dom
Important React Packages
Additional libraries for styling and state management to enhance your react projects.
React Interview Questions
React Interview questions categorised for different levels including most asked questions.
- Beginner Level Interview Questions (2024)
- Intermediate Level Interview Questions (2024)
- Advanced Level Interview Questions (2024)
- 7 Most Asked ReactJS Interview Questions
React Online Quizs
Test and Improve your knowledge with the well organised React Quizs
React Online Practice Exercise
Embark on your React learning journey with our online practice portal. Start by selecting quizzes tailored to your skill level. Engage in hands-on coding exercises, receive real-time feedback, and monitor your progress. With our user-friendly platform, mastering React becomes an enjoyable and personalized experience.
Elevate your coding expertise by going through our carefully curated Free Online React Exercises.
React Complete References
Refer to the following articles to have a quick glance at all the important key concepts which are helpful while developing web applications using React
- Basic Concepts Reference
- Components Complete Reference
- Props Reference
- Events Reference
- Hooks Reference
- Advanced Guide Reference
If you want to have a simple, quick reference to commonly used React methods you can refer to ReactJS Cheat Sheet article
Advantages of React
- Composable: React allows building reusable components, improving code organization and maintainability.
- Declarative: React’s declarative approach makes it easy to design interactive UIs by changing component states, with React handling the DOM updates.
- SEO-Friendly: React’s Single Page Application (SPA) setup can be optimized for SEO by rendering and indexing content properly.
- Large Community: React has a strong community and is widely used by major companies like Meta, Netflix, making it easier to find resources and support.
- Easy to Learn: React uses JSX, which resembles HTML, making it simple for developers with basic knowledge of HTML, CSS, and JavaScript.
- Easy Debugging: React’s unidirectional data flow simplifies debugging by ensuring that data moves in a clear, predictable direction within components.
If you want to learn more refer to this article React JS Advantages
React Tutorial - FAQ's
What is React used for?
The primary goal of React is to create a User Interface, Single-Page Application, Progressive Web Application and more.
Which language is used in React?
React used JavaScript programming language.
Is React a front-end language?
React globally used for Front-end JS library and it is popular with both software and project speoncer.
Which is in demand ReactJS or AngulerJS in 2024?
React is far more popular than AngulerJS because ReactJS comes with more libraries, resources and bigger community support.
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 ReatJS is better.
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.
