StrictMode Quiz
Test your knowledge of React StrictMode, including development checks, double rendering, Effect cleanup checks, ref callback checks, and caveats.
20 questions · free · answers explained
All questions in this quiz
- What is the main purpose of React StrictMode?
- Do StrictMode checks run in production builds?
- How do you enable StrictMode for an app tree?
- Which behavior can StrictMode trigger in development to find impure rendering?
- Why does StrictMode re-run Effects in development?
- What kind of bug can StrictMode find in callback refs?
- Can you opt out of StrictMode inside a subtree that is already wrapped by StrictMode?
- Where can StrictMode be enabled?
- What does StrictMode accept as props?
- What kind of code is most likely to be exposed by double rendering?
- Does StrictMode render visible duplicate UI in production?
- Which deprecated usage can StrictMode help surface?
- Why might a developer see an Effect run twice during development?
- What should you do when StrictMode exposes missing Effect cleanup?
- What does StrictMode assume about component render functions?
- Which code should not be placed in render just to satisfy StrictMode?
- What is a good reason to keep StrictMode enabled in a new app?
- If a third-party component fails under StrictMode, what is the likely issue?
- Does StrictMode provide an error boundary fallback?
- What is the best summary of StrictMode?
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