React is a JavaScript library developed by Facebook for building user interfaces using reusable components and a virtual DOM for efficient rendering.

What are React hooks?

Hooks are functions that allow you to use state and lifecycle features in functional components. Common hooks include useState, useEffect, useContext, and useReducer.

What is the virtual DOM?

The virtual DOM is an in-memory representation of the real DOM. React uses it to determine what changes need to be made and updates only those parts in the actual DOM efficiently.

React.js Interview Questions

311. How would you optimize React CI/CD pipelines for large monorepos?

312. What advanced caching strategies improve React build performance?

313. How do distributed frontend teams coordinate React deployments?

314. How would you design preview-environment strategies for React teams?

315. What rollback strategies work best for broken React releases?

316. How do stale frontend assets create operational incidents?

317. How would you globally invalidate outdated React bundles safely?

318. What observability systems are essential for React platforms?

319. How would you correlate React frontend telemetry with backend traces?

320. What runtime metrics are most useful for diagnosing React performance problems?