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undefined의 진짜 의미 #70

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samslow opened this issue Aug 5, 2020 · 1 comment

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samslow commented Aug 5, 2020

var a = {};
a.b; // undefined

여기서 b는 선언도 안됐는데 왜 undefiend인가요 ?

samslow assigned jinsunee

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jinsunee commented Aug 12, 2020 •

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객체 속성에 접근할 때 나오는 undefined 는 속성이 존재하지않음을 의미한다고 합니다.
그냥 자바스크립트에서 정해놓은 것 같아요.

[reference]
https://poiemaweb.com/js-object
https://ko.javascript.info/object
https://ko.khanacademy.org/computing/computer-programming/programming/objects/a/review-objects

samslow added the Answered label

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