Guarding Effects & Cleanup
Avoid memory leaks and stale updates by returning cleanups from effects, cancelling async work, and removing listeners/timeouts.
Why cleanup matters
Goal: Prevent leaks and stale updates.
- Always return a cleanup
- Cancel async with AbortController
- Remove listeners and clear timers
Cleanup rules
- Cleanup runs before component unmount and before the next effect
- Clean what you created in the effect
- Avoid setState after unmount
All lessons in this course
- Error Boundary Components (Class-Based Wrapper)
- Recovering UI & Reporting Strategies
- Guarding Effects & Cleanup