Reactive Programming in iOS with Combine

Feb 4 2021 · Swift 5.3, macOS 11.0, Xcode 12.2

Part 3: Combining Operators

16. Append

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Previous episode: 15. Prepend Next episode: 17. Challenge: Append and Prepend

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When you were learning about prepending operators in the last episode, were you thinking “there’s got to be appending operators too, right?” Well you are correct! Let’s look at the family of appending operators - we’ll go over each type, and then demo them in a playground.

example(of: "append(Output...)") {
  // 1
  let publisher = [1].publisher

  // 2
  publisher
    .append(2, 3)
    .append(4)
    .sink(receiveValue: { print($0) })
    .store(in: &subscriptions)
}

example(of: "append(Output...) #2") {
  // 1
  let publisher = PassthroughSubject<Int, Never>()

  publisher
    .append(3, 4)
    .append(5)
    .sink(receiveValue: { print($0) })
    .store(in: &subscriptions)

  // 2
  publisher.send(1)
  publisher.send(2)
  //publisher.send(completion: .finished)
}

example(of: "append(Sequence)") {
  // 1
  let publisher = [1, 2, 3].publisher

  publisher
    .append([4, 5]) // 2
    .append(Set([6, 7])) // 3
    .append(stride(from: 8, to: 11, by: 2)) // 4
    .sink(receiveValue: { print($0) })
    .store(in: &subscriptions)
}

example(of: "append(Publisher)") {
  // 1
  let publisher1 = [1, 2].publisher
  let publisher2 = [3, 4].publisher

  // 2
  publisher1
    .append(publisher2)
    .sink(receiveValue: { print($0) })
    .store(in: &subscriptions)
}