# PWA Interview Questions — Progressive Web Apps

Source: https://www.geekswithgeeks.com/hi/pwa/pwa-interview-questions

> Common PWA interview questions और discussion topics को master करें।

## Core PWA Concepts

Common interview topics: PWA को क्या define करता है? Service worker lifecycle? Caching strategies? Offline-first और network-first के बीच difference? Service worker updates को कैसे handle करते हैं? App shell model क्या है?

## Sample Q&A

Common PWA questions के लिए interview answer examples।

```markdown
**Q: What's the difference between network-first and cache-first?**
A: Network-first fetches from the network first, falling back to cache if offline—ideal for pages that change often. Cache-first serves from cache immediately, checking the network for updates—ideal for static assets.

**Q: How do you handle service worker updates?**
A: Listen to the 'controllerchange' event and the 'message' event in the service worker. Use skipWaiting() to activate immediately or notify users to refresh.

**Q: What's the app shell model?**
A: The app shell is the minimal static shell (HTML, CSS, JS) cached aggressively. Dynamic content loads separately. This pattern enables instant loads and offline-first architecture.
```

Output:

```
Common interview questions and comprehensive answers prepared.
```

## Interview Tips

Demo PWA build करके, caching strategies में trade-offs को explain करके, real-world PWA implementations (Twitter Lite, Spotify) को discuss करके और browser compatibility को समझकर prepare करें।

त्वरित जाँच

**Quiz:** PWA में service worker का मुख्य उद्देश्य क्या है?

- [x] Network requests को intercept करना, offline functionality को enable करना और caching को handle करना
- [ ] User interface को render करना
- [ ] User authentication tokens को store करना

*Answer:* Network requests को intercept करना, offline functionality को enable करना और caching को handle करना. Service workers background scripts हैं जो requests को intercept करते हैं, caches को manage करते हैं और offline support को enable करते हैं।