rerender-functional-setstate

SKILL.md

When updating state based on the current state value, use the functional update form of setState instead of directly referencing the state variable. This prevents stale closures, eliminates unnecessary dependencies, and creates stable callback references.

The first callback is recreated every time items changes, which can cause child components to re-render unnecessarily. The second callback has a stale closure bug—it will always reference the initial items value.

Note: If your project has React Compiler enabled, the compiler can automatically optimize some cases, but functional updates are still recommended for correctness and to prevent stale closure bugs.

오래된 클로저와 불필요한 콜백 재생성을 방지하려면 기능적 setState 업데이트를 사용하세요. React 컴포넌트의 현재 상태 값을 기준으로 상태를 업데이트할 때 적용합니다. 출처: theorcdev/8bitcn-ui.

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