Publisher extension - asResult

publisher+asresult.swift

// Source: https://www.swiftbysundell.com/articles/the-power-of-extensions-in-swift/

extension Publisher {
    func asResult() -> AnyPublisher<Result<Output, Failure>, Never> {
        self.map(Result.success)
            .catch { error in
                Just(.failure(error))
            }
            .eraseToAnyPublisher()
    }
}

Usage

class AsyncValue<Value: Decodable>: ObservableObject {
    @Published private(set) var result: Result<Value, Error>?
    private var cancellable: AnyCancellable?

    func load(from url: URL,
              using session: URLSession = .shared,
              decoder: JSONDecoder = .init()) {
        cancellable = session.dataTaskPublisher(for: url)
            .map(\.data)
            .decode(type: Value.self, decoder: decoder)
            .asResult()
            .sink { [weak self] result in
                self?.result = result
            }
    }
}