REACT Tutorial

What is React?

React is an open-source JavaScript library developed by Facebook to help developers build fast, interactive, and reusable user interfaces (UIs) for web applications.

It focuses on building UI components — small, independent, and reusable pieces of the user interface — that you can combine to create complex apps.

• ✔ Declarative — you describe what the UI should look like, and React takes care of updating it when data changes.
• ✔ Component-Based — build encapsulated components that manage their own state.
• ✔ Efficient — React uses a virtual DOM to minimize real DOM manipulations and speed up rendering.

Why Use React?

• ✔ Write less code by reusing components.
• ✔ Create interactive UIs with dynamic data.
• ✔ Large community and ecosystem with plenty of libraries and tools.
• ✔ Easy to learn if you already know JavaScript and HTML.

How React Works

Instead of directly manipulating the browser’s Document Object Model (DOM), React creates a lightweight copy called the virtual DOM. When your app’s state changes, React efficiently figures out what changed by comparing the virtual DOM with the real DOM and updates only the necessary parts.

React Component Example

import React from 'react';

function Welcome() {
  return (
    <h1>Hello, React!</h1>
  );
}

export default Welcome;

  

This simple component returns an HTML heading. You can use this Welcome component anywhere in your React app to display "Hello, React!".

Want to try React?

Use the official Create React App tool to quickly set up your project:

npx create-react-app my-react-app
cd my-react-app
npm start