react-useeffect

SKILL.md

Effects are an escape hatch from React. They let you synchronize with external systems. If there is no external system involved, you shouldn't need an Effect.

| Derived state from props/state | useState + useEffect | Calculate during render | | Expensive calculations | useEffect to cache | useMemo | | Reset state on prop change | useEffect with setState | key prop | | User event responses | useEffect watching state | Event handler directly |

| Notify parent of changes | useEffect calling onChange | Call in event handler | | Fetch data | useEffect without cleanup | useEffect with cleanup OR framework |

Best Practices für React UseEffect. Wird zum Schreiben von Effekten, abgeleiteten Werten oder zum Abrufen von Daten verwendet. Lehrt, wann Effekte und bessere Alternativen wie useMemo oder Key Props NICHT verwendet werden sollen. Quelle: nweii/agent-stuff.

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