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TypeError : sectionData.map is not a function

오늘의 에러는?유저메세지 목록을 데이터로 받아 map()을 활용 화면에 뿌리는 작업을 하던중 타입에러 발생했다. API통신으로 데이터 저장까지 문제없이 진행했는데 에러라느 왜??라고 한참 생각하다. 번뜩 떠오른 것은 바로 자료형!내가 쓰려던 sectionData의 모습

2020년 3월 19일
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