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      <title>`??` vs `||`, 0이 사라지는 버그의 원인</title>
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      <description>?? 연산자(nullish coalescing)와 ||의 결정적 차이 — 0과 빈 문자열이 기본값에 먹히는 버그의 원인입니다. falsy의 함정, ??= 할당, 옵셔널 체이닝 조합, 그리고 둘을 섞으면 SyntaxError가 나는 이유까지 정리했습니다.</description>
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