RxSwift Traits

Single

A Single is a variation of Observable that, instead of emitting a series of elements, is always guaranteed to emit either a single element or an error.

• Emits exactly one element, or an error.
• Doesn't share side effects.

UseCase

• HTTP Request에서 response 또는 error를 받아올 때 사용 가능

How To

• Single<Type>.create { } 로 생성
• .subscribe 로 observe
  • onSuccess, onError 이벤트만 처리
  • 받아온 result 를 .success 또는 .failure 로 switch-case 처리

Completable

A Completable is a variation of Observable that can only *complete* or emit an error. It is guaranteed to not emit any elements.

• Emits zero elements.