import Combine

// Published property
@Published var username: String = ""

// CurrentValueSubject
let subject = CurrentValueSubject<String, Never>("initial")

// PassthroughSubject
let passthrough = PassthroughSubject<Int, Never>()

// Just publisher
let just = Just("value")

// Future publisher
let future = Future<String, Error> { promise in
    promise(.success("result"))
}

// Sink
let cancellable = publisher.sink(
    receiveCompletion: { completion in
        switch completion {
        case .finished:
            print("Completed")
        case .failure(let error):
            print("Error: \(error)")
        }
    },
    receiveValue: { value in
        print("Value: \(value)")
    }
)

// Assign
let cancellable = publisher
    .assign(to: \.text, on: label)

private var cancellables = Set<AnyCancellable>()

publisher
    .sink { value in
        print(value)
    }
    .store(in: &cancellables)

publisher
    .filter { $0 > 0 }
    .map { $0 * 2 }
    .debounce(for: .seconds(0.5), scheduler: RunLoop.main)
    .removeDuplicates()
    .sink { value in
        print(value)
    }