Rules for useEffect usage in React including when to avoid it and when to extract it into custom hooks. Use when writing or reviewing React components that contain or might need useEffect.
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useEffectは外部システム(ブラウザAPI、ネットワーク、サードパーティライブラリ)との同期にのみ使います。
それ以外の用途では、より適切な代替手段がないか検討してください。
参考: You Might Not Need an Effect
// Bad: useEffectでstateを更新
const [fullName, setFullName] = useState("");
useEffect(() => {
setFullName(firstName + " " + lastName);
}, [firstName, lastName]);
// Good: レンダリング中に計算
const fullName = firstName + " " + lastName;
[Description truncada. Veja o README completo no GitHub.]
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