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javascript null & undefined
같은 듯 다른 null과 undefined에 대해 알아보자. null & undefined 는 원시데이터타입(Primitive data type)에 속한다.null은 개발자가 빈값이라고 지정한 상태, 비어있는, 존재하지 않는 값null을 typeof 키워드를 활용해 콘
2020년 4월 1일
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