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load.first() 사용하여 꺼내는 이유는
first() 함수는 Flow에서 가장 첫 번째 값을 받아옵니다. 이 함수를 호출하면 Flow가 첫 번째 값을 내보낼 때까지 기다립니다.
이후에는 더 이상 새로운 값을 받아오지 않습니다.
first()를 사용하면 Flow에서 가장 먼저 도착한 값을 얻을 수 있습니다. 이는 Flow의 비동기적인 특성을 감안하여 사용됩니다.
save = 입력값(key)에 해당하는 value값을 입력값 + ocid 라는 텍스트로 지정하여 저장
load = 입력값에 해당하는 value값을 리턴받음