React Introduction

🚀 React Introduction

React (also called React.js or ReactJS) is a popular JavaScript library used to build user interfaces (UI), especially for single-page applications. It was developed by Facebook (Meta) and is now maintained by Meta and an open-source community.

🔥 Why Use React?

React is widely used because it makes building complex UI easy with reusable components. It is:

✔️ Fast
✔️ Scalable
✔️ Component-Based
✔️ Developer-Friendly

🧠 Key Features of React

Feature Description
Component-Based UI is built using small reusable components.
Virtual DOM Faster rendering compared to traditional DOM updates.
JSX A syntax that allows writing HTML-like code inside JavaScript.
Declarative UI You describe the UI, and React builds and updates it efficiently.
One-Way Data Flow Data flows in one direction, making apps predictable and easy to debug.

🧱 What is JSX?

JSX (JavaScript XML) allows you to write HTML in JavaScript.

Example:

⚙️ React Basic Example


 

🧰 How to Install React?

Using Create React App:

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

Or using Vite (recommended for speed):

npm create vite@latest my-app --template react
cd my-app
npm install
npm run dev

📦 React Component Types

1️⃣ Functional Component (Modern & Recommended)

2️⃣ Class Component (Older Style)

🎯 What Can You Build with React?

  • Web applications

  • Dashboards

  • E-commerce sites

  • Social media platforms

  • Interactive UI systems

  • And even mobile apps using React Native

🌍 Companies Using React

  • Meta (Facebook, Instagram)

  • Netflix

  • Airbnb

  • Uber

  • Amazon

  • Dropbox

✔️ Summary

React simplifies UI development using reusable components and fast rendering (Virtual DOM). It’s one of the most powerful tools in modern web development.

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