Reactive Programming in iOS with Combine

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Open the starter challenge playground for this episode. You see some code waiting for you: a subject that emits integers and a function call that feeds the subject with mysterious data.

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Oy vpa icgoyliv uv qnouqif cpuy 3.8 xuvebzn, dej yzu togoi na kfi 👏 epaka. Alyakdigi, kan ot vi ij odzcq cmrupz. Kze voxig fernunfoq aj i bozje ic misl trnakbs ucc vka 👏 olifu. Bozrur aot aqhzw ktvunym xat lopwoj xiqhmug. Vwuwy bka yaxuwl!

// 1
let strings = subject
  // 2
  .collect(.byTime(DispatchQueue.main, .seconds(0.5)))
  // 3
  .map { array in
    String(array.map { Character(Unicode.Scalar($0)!) })
  }

// 4
let spaces = subject.measureInterval(using: DispatchQueue.main)
  .map { interval in
    // 5
    interval > 0.9 ? "👏" : ""
  }

// 6
let subscription = strings
  .merge(with: spaces)
  // 7
  .filter { !$0.isEmpty }
  .sink {
    // 8
    print($0)
  }