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⚡ Bolt: 배열 최댓값 계산 시 reduce 및 useMemo 적용하여 성능 최적화 - #793
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| ## 2025-02-19 - 배열 최댓값 계산 시 Math.max와 스프레드 연산자 사용으로 인한 성능 및 콜 스택 이슈 해결 | ||
| **Learning:** React 컴포넌트(`DelegationInsight`, `MembersPage`, `TopUsersList` 등)에서 리스트 렌더링 시 배열의 최댓값을 구하기 위해 `Math.max(...array)`를 사용하면 배열 크기가 클 때 'Maximum call stack size exceeded' 에러가 발생할 수 있습니다. 또한 매 렌더링 주기마다 무거운 동기적 계산을 반복하여 성능 저하를 초래합니다. | ||
| **Action:** 항상 `Math.max(...array)` 대신 `.reduce((max, item) => Math.max(max, item), 0)`를 사용하여 모든 크기의 데이터셋을 안전하게 처리해야 합니다. React 컴포넌트에서 이러한 파생 값을 계산할 때는 `useMemo`로 감싸 데이터가 변경될 때만 재계산되도록 하여 불필요한 렌더링을 방지해야 합니다. |
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🔍 Earlier optimization guidance disappears
The new lesson replaces the existing Date.parse guidance rather than adding to it. Reviewers lose the prior optimization rationale.
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| const maxCount = useMemo( | ||
| () => insight.topAgents.reduce((max, a) => Math.max(max, a.callCount), 1), | ||
| [insight.topAgents], | ||
| ); |
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🔍 Bounded lists weaken the performance case
The weekly agent list holds at most ten entries; overview users holds five. Neither spread-based maximum reaches argument limits, and memoization adds bookkeeping for these small reductions.
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💡 What
React 컴포넌트(
DelegationInsight,MembersPage,TopUsersList) 내 배열 최댓값 계산 로직에서Math.max(...array)를.reduce()방식으로 변경하고,useMemo를 적용하여 렌더링 최적화를 수행했습니다.🎯 Why
배열 크기가 클 경우
Math.max(...array)방식은 콜 스택 초과(Maximum call stack size exceeded) 에러를 발생시킬 위험이 있습니다. 또한, 매 렌더링마다 배열 전체를 순회하며 최댓값을 구하는 계산은 컴포넌트의 성능 저하를 초래할 수 있으므로 메모이제이션이 필요합니다.📊 Impact
useMemo를 통해 배열이 변경될 때만 최댓값을 다시 계산하므로 불필요한 연산을 줄이고 렌더링 성능이 향상됩니다.🔬 Measurement
pnpm test -- --coverage명령어를 통해 테스트 코드를 실행하여 정상 작동 여부와 커버리지를 확인합니다. 기능의 변경 없이 성능 이점이 적용되었는지 확인할 수 있습니다.PR created automatically by Jules for task 11611458650646585268 started by @seonghobae