Скачать или смотреть 18 React questions for FAANG interviews Questions with Answers (2025 Edition) | 2025-08-27 03:16 PM

📘 Neulax - React Interview Prep
This video contains 18 React interview questions with answers.

📝 Questions & Answers:

Q1: How does Design systems in React relate to other React concepts?
A1: Pairs with related React features to manage data, rendering, and effects coherently. Example: shared tokens for color, spacing, and typography.

Q2: How does Caching and invalidation scale in large apps?
A2: Scales well when boundaries are clear and shared pieces are standardized. Example: refreshing product cache after an update.

Q3: Why use Redux overview?
A3: Used to solve a clear UI or state problem and reduce duplication. Example: time-travel debugging during development.

Q4: How does Context vs Redux improve user experience?
A4: Improves perceived speed and clarity by reducing clutter and surfacing timely feedback. Example: small app uses context; large app with many updates uses Redux.

Q5: What is Monorepos for frontends?
A5: Monorepos for frontends refers to a concept or tool in React that helps structure, manage, or render UI efficiently. Example: centralizing packages for shared tooling and versioning.

Q6: How do you decide whether to use Loading states?
A6: Choose it if it simplifies data flow and improves maintainability over time. Example: showing a skeleton for product cards while data arrives.

Q7: What trade‑offs come with Lazy loading?
A7: Adds concepts and setup overhead in exchange for structure, reuse, or speed. Example: deferring rarely used settings pages.

Q8: How do you test or verify ARIA roles and attributes works as intended?
A8: Verify behavior through observable outcomes and edge cases rather than internal implementation. Example: helping assistive tech understand non-standard controls.

Q9: How does Lazy loading scale in large apps?
A9: Scales well when boundaries are clear and shared pieces are standardized. Example: waiting to load image galleries below the fold.

Q10: What performance considerations apply to Resilience patterns in UI?
A10: Watch for heavy computations, needless renders, and large assets; optimize where measurement points. Example: fallbacks when data is slow or missing.

Q11: How do you test or verify CDN strategies for React apps works as intended?
A11: Verify behavior through observable outcomes and edge cases rather than internal implementation. Example: using cache headers to control freshness.

Q12: What are common pitfalls with Local vs global state?
A12: Typical issues include overuse, missing cleanup, and unnecessary re-renders. Example: keeping a checkbox local but user session data global.

Q13: How does Class components (legacy) relate to other React concepts?
A13: Pairs with related React features to manage data, rendering, and effects coherently. Example: maintaining legacy pages while gradually migrating.

Q14: What are common pitfalls with Accessibility (a11y) fundamentals?
A14: Typical issues include overuse, missing cleanup, and unnecessary re-renders. Example: operable UI with keyboard and assistive tech.

Q15: How would you communicate Reducing prop drilling to stakeholders?
A15: Summarize the user impact, maintenance benefits, and risks in plain language. Example: using context or a store to share data across deep trees.

Q16: When would you use Next.js routing (concept)?
A16: Applied when the interface needs that capability or when simpler patterns start to strain. Example: file-based routes that map clearly to pages.

Q17: How would you communicate Controlled forms to stakeholders?
A17: Summarize the user impact, maintenance benefits, and risks in plain language. Example: validating an email as the user types.

Q18: How does JSX relate to other React concepts?
A18: Pairs with related React features to manage data, rendering, and effects coherently. Example: laying out a header, content, and footer clearly in one place.

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