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

341. How do dynamic rendering patterns affect screen-reader reliability?

342. How would you implement continuous accessibility validation in React CI/CD pipelines?

343. What focus-management anti-patterns commonly appear in React SPAs?

344. How would you design resilient keyboard-navigation systems in React applications?

345. How do React rendering strategies affect SEO reliability?

346. What advanced SSR caching strategies apply to React systems?

347. How would you architect edge-rendered React deployments?

348. What CDN consistency challenges occur in streaming SSR systems?

349. How would you optimize React streaming SSR for global traffic patterns?

350. What operational challenges arise during selective hydration rollouts?