Swift Combine 的类型看着真心累啊

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

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› Perfect Web Framework

› Kitura Web Framework

This topic created in 1392 days ago, the information mentioned may be changed or developed.

func stories() -> AnyPublisher<[Story], Error> {
    URLSession.shared
      .dataTaskPublisher(for: EndPoint.stories.url)
      .map(\.data)
      .decode(type: [Int].self, decoder: decoder)
      .mapError { error -> API.Error in
        switch error {
        case is URLError:
          return Error.addressUnreachable(EndPoint.stories.url)
        default:
          return Error.invalidResponse
        }
      }
      .filter({ !$0.isEmpty })
      .flatMap { storyIDs in
        mergedStories(ids: storyIDs)
      }
      .scan([]) { stories, story -> [Story] in
        stories + [story]
      }
      .map{ $0.sorted() }
      .eraseToAnyPublisher()
}

光标放在 eraseToAnyPublisher 后面，按 esc ，能看到最后的类型