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

371. How do React applications support globally distributed deployments?

372. How would you optimize React applications for low-bandwidth emerging markets?

373. What internationalization bottlenecks occur in large React systems?

374. How would you manage multilingual React deployments at scale?

375. What runtime localization performance issues emerge in React applications?

376. How would you design highly extensible React plugin ecosystems?

377. What runtime isolation mechanisms support safe React plugin execution?

378. How would you version React plugin contracts safely?

379. What governance challenges emerge in React plugin platforms?

380. How do React build systems evolve with modern frontend tooling?