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

331. What rendering bottlenecks occur in trading-style React interfaces?

332. How do browser scheduling priorities interact with React concurrent rendering?

333. How would you minimize interaction latency in highly dynamic React systems?

334. How do browser paint and layout phases influence React UX?

335. How would you optimize React applications for battery efficiency on mobile devices?

336. What mobile rendering constraints impact React hydration?

337. How do low-memory environments affect React runtime behavior?

338. How would you adapt React rendering strategies dynamically based on device capabilities?

339. What advanced accessibility governance practices apply to React ecosystems?

340. How would you ensure accessibility compliance across React component libraries?