The Psychological effects of UseEffects
summary
Explains concrete gotchas and fixes for useEffect: empty dependency array means “never-changing” values not magic; returning a cleanup runs when that effect re-runs or unmounts (not on mount); never return null or you hit the error "destroy is not a function"; calling setState inside a cleanup can trigger endless re-renders; use a mutable isMounted ref pattern set after mount to avoid first-run behavior; migrating CodeSandbox hooks to hooks takes months because subtle order and dependency mistakes break behavior.
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chapters (4)
- 0:00HACKTOBERFEST BACKSTORY
- 1:31THE PSYCHOLOGICAL EFFECTS OF USEEFFECT
- 2:37WHEN THE COMPONENT
- 3:56WE HAVE THREE THINGS TO PLAY WITH
