RxSwiftSubscribeonNextonErroronCompletedHot and ColdHot - Observable 생성되자마자 Cold - Observable 구동할때DisposeBag addvar disposebag = DisposeBag() 1번 disposebag.insert(dispose) 2번 .disposed(by: disposebag)orEmpty비어있을 때 null을 안보냄.inputTextField에 좋은듯???just 그대로 [1,2,3,4]from 순차적으로 1234map,filter,reduce 등onNext보다 먼저 실행.Operator생성변환필터링결합오류처리조건과 불린 연산자참고http://reactivex.io/http://rxmarbles.com/https:/..