Frontend & React Interview Questions
Frontend interview questions on React Hooks, Virtual DOM, closures, web performance, and JavaScript fundamentals.
Frontend interviews blend JavaScript fundamentals, React concepts, and performance optimization. Companies test your understanding of how frameworks work under the hood—Virtual DOM, reconciliation, hooks lifecycle—as well as your ability to write clean, maintainable code and optimize for Core Web Vitals. A strong candidate can explain closures, prototype chains, and React Fiber with the same ease as implementing a custom hook.
This hub covers React Hooks (useState, useEffect, custom hooks), Virtual DOM and diffing, JavaScript closures and execution context, and web performance (lazy loading, code splitting, caching). Each topic includes common interview questions with concise answers and practical examples. Whether you are interviewing at a product company or a startup, these guides help you demonstrate both breadth and depth in frontend development.
Trending Sub-topics
- React Hooks— React Hooks interview questions — useState, useEffect, useContext, custom hooks patterns.
- Virtual DOM— Virtual DOM interview questions — reconciliation, diffing algorithm, React Fiber.
- Closures— JavaScript closures interview questions — lexical scope, execution context, practical use cases.
- Web Performance— Web performance interview questions — Core Web Vitals, lazy loading, code splitting, caching.
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