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Callback 함수 문제를 해결 - Promise

데이터 송수신 장애, 물리적 제약 등 여러 요인에 의해 delay가 발생하는 경우에는, 비동기 함수를 사용하여 delay 시간 동안에도 다른 코드 실행을 하도록 해야하는데, 여러 함수의 return값이 chain 형태로 엮여 있는 경우, 일반 call back func

2020년 12월 4일
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