[Swift, RxSwift] 매번 헷갈리는 map, flatmap.

 

Single.just(1).map { (input) -> String in

        return "Value = \(input)"

    }.flatMap { (input) -> PrimitiveSequence<SingleTrait, String> in

        Single.just(input + " Desu.")

    }.subscribe(onSuccess: { (result) in

        print(result)

    }).disposed(by: disposeBag)