Arrlindii

let keyboardWillOpen = NotificationCenter.default
    .publisher(for: UIResponder.keyboardWillShowNotification)
    .map {$0.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! CGRect}
    .map {$0.height}


let keyboardWillHide =  NotificationCenter.default
    .publisher(for: UIResponder.keyboardWillHideNotification)
    .map { _ in CGFloat(0)}

Arrlindii

let germanCities = PassthroughSubject<String, Never>()
let italianCities = PassthroughSubject<String, Never>()
let europianCities = Publishers.Merge(germanCities, italianCities)

_ = europianCities.sink(receiveValue: { city in
    print("\(city) is a city in europe")
})

germanCities.send("Munich")
germanCities.send("Berlin")

Arrlindii

_ = Publishers.Sequence(sequence: [1,2,2,3,3,4,7])
    .map { $0 * 2 }
    .flatMap { Publishers.Just($0) }
    .filter { $0.isMultiple(of: 2) }
    .dropFirst(3)
    .removeDuplicates()
    .sink(receiveValue: { value in
        print(value)
    })

Arrlindii

_ = Publishers.Sequence(sequence: [1,2,4])
    .map { $0 * 10 }
    .flatMap { Publishers.Just($0) }
    .sink(receiveValue: {
        print($0)
    })

Arrlindii

let subject = PassthroughSubject<String, Never>()
let publisher = subject.eraseToAnyPublisher()


let subscriber1 = publisher.sink(receiveValue: { value in
    print(value)
})

//subscriber1 will recive the events but not the subscriber2
subject.send("Event1")

Arrlindii

let subject = PassthroughSubject<String, Never>()
let publisher = subject.eraseToAnyPublisher()

let subscriber = publisher.sink(receiveValue: { value in
    print(value)
})

subject.send("Combine") //The Subscriber will print "Combine"
subject.send("Swift")   //The Subscriber will print "Swift"

Arrlindii

let subscriber = publisher.sink(receiveCompletion: { _ in
    print("finished")
}) { value in
    print(value)
}

Arrlindii

let publisher = Publishers.Just("Combine Swift")
let subscribtion = publisher.sink { value in
  print(value)
}

Arrlindii

let publisher = Publishers.Just("Combine Swift")
let sequencePublisher = let publisher = Publishers.Sequence(sequence: [1,2,3,5,6])

Arrlindii

protocol DisountStrategy {
    func presentDiscountMessage()
}

struct NoDiscountStrategy: DisountStrategy {
    //Provides handling for non discount case
}

struct DefaultDiscountStrategy: DisountStrategy {
    //Provides handling for discount case