1. Introduction to
Functional Reactive
Programming
EliaszSawicki.com ( @EliSawic )

2. Functional Reactive
Programming
EliaszSawicki.com ( @EliSawic )

3. Streams
EliaszSawicki.com ( @EliSawic )

4. Stream
EliaszSawicki.com ( @EliSawic )

5. Arrays
let values = [1, 2, 3, 4]
let doubledValues = values.map { $0 * 2 }
let higherThanTwo = values.filter { $0 > 2 }
let sum = values.reduce(0, +)
EliaszSawicki.com ( @EliSawic )

6. Filter
EliaszSawicki.com ( @EliSawic )

7. Combine Latest
EliaszSawicki.com ( @EliSawic )

8. Chaining manipulations
let names = nameField.reactive.text
EliaszSawicki.com ( @EliSawic )

9. Chaining manipulations
names.filter { $0.characters.count >= 3}
EliaszSawicki.com ( @EliSawic )

10. Chaining manipulations
names.filter { $0.characters.count >= 3}
.map { return "Dear" + $0 }
EliaszSawicki.com ( @EliSawic )

11. Chaining manipulations
let prefixedNames = names.filter { $0.characters.count >= 3}
.map { return "Dear" + $0 }
let combined = combineLatest(prefixedNames, surnames)
combined.observeValues { prefixedNames, surname in
print("Form input is (prefixedNames) (surname)")
}
EliaszSawicki.com ( @EliSawic )

12. www.rxmarbles.com
EliaszSawicki.com ( @EliSawic )

13. ReactiveSwift
EliaszSawicki.com ( @EliSawic )

14. Events flow
EliaszSawicki.com ( @EliSawic )

15. Non-Terminating
• Next
EliaszSawicki.com ( @EliSawic )

16. Terminating
• Completed
• Failed
• Interrupted (Reactive Cocoa)
EliaszSawicki.com ( @EliSawic )

17. This screen is a signal
EliaszSawicki.com ( @EliSawic )

18. Represents events
over time
EliaszSawicki.com ( @EliSawic )

19. Observe
EliaszSawicki.com ( @EliSawic )

20. EliaszSawicki.com ( @EliSawic )

21. If you don't observe,
it's gone
EliaszSawicki.com ( @EliSawic )

22. Observing
presentation.observeValues { idea in
remember(idea: idea)
}
presentation.observeCompleted {
print("Time for a break")
}
EliaszSawicki.com ( @EliSawic )

23. Signal producer
EliaszSawicki.com ( @EliSawic )

24. Represents a tasks
EliaszSawicki.com ( @EliSawic )

25. Does not start it's
work if not asked
EliaszSawicki.com ( @EliSawic )

26. Producing
presenter.startWithSignal { (signal, _) in
signal.observeValues { idea in
print(idea)
}
signal.observeCompleted {
print("Time for a break")
}
}
EliaszSawicki.com ( @EliSawic )

27. Hot vs Cold
EliaszSawicki.com ( @EliSawic )

28. Signal SignalProducer
presentation.observeValues presentation.startWithValues
EliaszSawicki.com ( @EliSawic )

29. Signal SignalProducer
presentation.observeValues presentation.startWithValues
emits values all the time waits for your request
EliaszSawicki.com ( @EliSawic )

30. Properties
EliaszSawicki.com ( @EliSawic )

31. Bindings
EliaszSawicki.com ( @EliSawic )

32. Binding example
let (slides, _) = Signal<Slide, NoError>.pipe()
label.reactive.text <~ slides.map { return "Slide: ($0.number)" }
EliaszSawicki.com ( @EliSawic )

33. Memory Management
EliaszSawicki.com ( @EliSawic )

34. Disposables
EliaszSawicki.com ( @EliSawic )

35. Free your memory
let disposable = signal.observeValues { value in
...
}
deinit {
disposable.dispose()
}
EliaszSawicki.com ( @EliSawic )

36. FUNctional reactive
programming
EliaszSawicki.com ( @EliSawic )