React.js Kya Hai?
React.js ek JavaScript library hai jo user interfaces (UI) banane ke लिए use hoti है—specifically Single Page Applications (SPA) ke लिए. React ko Facebook ne 2013 me launch kiya tha aur aaj ke time me yeh duniya ki sabse popular frontend libraries me se ek hai.
React ka main goal hai: fast, responsive, reusable UI components banakar web apps ko scalable banana.
React.js Ka Use Kaha Hota Hai?
React ka use dynamic websites ya web applications banane me hota hai. Agar aapko ek aisa website banana hai jisme user interaction ho jaise login, forms, search, filtering, etc., to React perfect choice hai.
Examples:
- Instagram (React-based hai)
- Netflix (Frontend kaafi hissa React me hai)
React.js Kaise Kaam Karta Hai?
React ka main concept hai Components.
Component:
Ek component ek chhota hissa hota hai UI ka, jaise:
- Button
- Navbar
- Form
- Product Card
Aap har chhoti UI cheez ko component bana ke use kar sakte ho, baar-baar reuse kar sakte ho.
React.js ke Key Features
| Feature | Description |
|---|---|
| JSX | HTML + JavaScript ka mixture (looks like HTML in JS) |
| Virtual DOM | Fast rendering using virtual DOM (real DOM se zyada fast) |
| Component-Based | Har UI part ko chhote-chhote components me todna |
| Unidirectional Data Flow | Data ek direction me flow karta hai (easy to debug) |
| Hooks (React 16.8+) | Functional components me state aur logic ka use |
React.js Install Kaise Kare?
Step 1: Node.js install karein
Step 2: React App banayein (using Create React App)
bashCopyEditnpx create-react-app my-app
cd my-app
npm start
Ab http://localhost:3000 par aapka React app chal raha hoga.
React.js ka Code Example
jsxCopyEditimport React from 'react';
function Welcome() {
return <h1>Namaste, React!</h1>;
}
export default Welcome;
Yeh ek basic React functional component hai jo “Namaste, React!” render karta hai.
React.js Sikhne ke Liye Kya Aana Chahiye?
Agar aap React seekhna chahte hain, to yeh cheezein aapko aani chahiye:
-> Basic HTML & CSS
-> JavaScript Fundamentals (functions, arrays, objects)
-> ES6 concepts (let/const, arrow functions, spread/rest, etc.)
React.js Kahan Se Seekhein? (Free Resources)
- React Official Docs
- FreeCodeCamp YouTube Tutorials
- CodeWithHarry (Hindi me React course)
- Udemy Paid Courses (React Projects ke liye best)
React.js Me Career Scope
Aaj ke time me React developers ki massive demand hai. Freelancing sites, startups, MNCs—sabko React devs chahiye. Aap React seekhkar:
- Freelancer ban sakte hain (Fiverr, Upwork)
- Remote job le sakte hain
- Apna product/app bana sakte hain
Conclusion
React.js ek powerful tool hai jo modern frontend development ka future hai. Agar aap frontend developer banna chahte hain, to React sikhna must hai. Yeh fast, reusable aur scalable web apps banane me madad karta hai.
Aapka Feedback?
Aapko React.js ke baare me kya lagta hai? Kya aapne pehle React try kiya hai?
Comment karke zarur batayein!
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