Introduction to React — Free App Development Tutorial

TL;DR: Learn Introduction to React in App Development with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Introduction to React in App Development

React is a JavaScript library for building user interfaces using a component-based architecture.

React uses a virtual DOM to efficiently update only the parts of the real DOM that have changed.

JSX (JavaScript XML) is React's syntax extension that allows you to write HTML-like code inside JavaScript.

React apps are built by composing small, reusable components that manage their own state and props.

Create React App and Vite are the most common tools for bootstrapping a new React project.

// JSX — looks like HTML but is JavaScript
function Greeting({ name }) {
  return <h1>Hello, {name}!</h1>;
}

// Render to the DOM
import ReactDOM from 'react-dom/client';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Greeting name="World" />);

Learn Introduction to React step by step with Syllab's free interactive App Development tutorial — runnable code examples, practice exercises and instant AI feedback, all free with no signup. Explore the full App Development course →