Slides from the speech "Discovering RxJS".

1. angelo.scotto@computer.org

2. • Free contest
• innovative
• €20,000
•
• June 30, 2016
• «End of September» 2016:
• Make us proud 
http://bit.ly/efsa_hackathon

3. MSDN Rx introduction

4. MSDN Rx introduction

5. •
•
•

7. Aggregate<T>
Iterator<T> CreateIterator()
Iterator<T>
void First()
void Next()
bool IsDone()
T CurrentItem()
IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
void Reset()
bool MoveNext()
T Current()

8. Single Multiple
Sync/Pull T
IEnumerable<T>
Iterable of T
Async/Push
Task<T>
Promise<T>
Future<T>
?

9. Benjamin Franklin

10. •
•
•
• dual
•

11. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
???
IDualEnumerator<T>
???

12. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???
IDualEnumerator<T>
???

13. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
???

14. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void ???

15. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void ???(
T
)

16. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void ???(
bool,
…,
T
)

17. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void ???(
bool,
Exception,
T
)

18. IEnumerable<T>
IEnumerator<T> GetEnumerator()
IEnumerator<T>
bool MoveNext()
T Current()
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

20. Subject
void Attach(Observer)
void Detach(Observer)
Notify()
Observer
void Update()

21. Subject
void Attach(Observer)
void Detach(Observer)
Notify()
Observer
void Update()

22. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Notify(T)
Observer<T>
void Update(T)

23. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Observer<T>
void Update(T)
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

24. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Observer<T>
void Update(T)
IDualEnumerable<T>
void ???(IDualEnumerator<T>)
IDualEnumerator<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

25. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Observer<T>
void Update(T)
IObservable<T>
void Subscribe(IObserver<T>)
IObserver<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

26. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Observer<T>
void Update(T)
IObservable<T>
void Subscribe(IObserver<T>)
void Unsubscribe(IObserver<T>)
IObserver<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

27. Subject<T>
void Attach(Observer<T>)
void Detach(Observer<T>)
Observer<T>
void Update(T)
IObservable<T>
IDisposable Subscribe(IObserver<T>)
IObserver<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()

28. IObservable<T>
IDisposable Subscribe(IObserver<T>)
IObserver<T>
void OnNext(T)
void OnError(Exception)
void OnComplete()
•
•
•

29. Single Multiple
Sync/Pull T
IEnumerable<T>
Iterable of T
Async/Push
Task<T>
Promise<T>
Future<T>
IObservable<T>

30. Single Multiple
Sync/Pull T
IEnumerable<T>
Iterable of T
Async/Push
Task<T>
Promise<T>
Future<T>
IObservable<T>
•

31. Single Multiple
Sync/Pull T
IEnumerable<T>
Iterable of T
Async/Push
Task<T>
Promise<T>
Future<T>
IObservable<T>
•
•

32. Antoine de Saint-Exupéry

33. http://bit.ly/discoveringrxjs

34. 1.
2. Composition operators & grammar.
3.

35. Emit only those items from an Observable that
pass a predicate test
0 431 2
0 4

36. Transform the items emitted by an Observable by
applying a function to each item
0 1 2
0 1
43
2 3 4

37. Discard any items emitted by an Observable after a
second Observable emits an item or terminates
0 1 2 43
0 1 2

38. http://bit.ly/discoveringrxjs

39. Transform the items emitted by an Observable into
Observables, then flatten the emissions from those
into a single Observable

40. Transform the items emitted by an Observable into
Observables, then flatten the emissions from those
into a single Observable

41. Transform the items emitted by an Observable into
Observables, then flatten the emissions from those
into a single Observable

43. Events as Observables
Iterable as Observable
Promise as Observable

44. http://bit.ly/discoveringrxjs

45. 1.
2.
3. Schedulers and Time.

46. • Subscribe
subscribeOn
• Observe
observeOn
mainly generators

47. Scheduler Description
immediate Gets a scheduler that schedules work
immediately on the current thread.
currentThread Gets a scheduler that schedules work
as soon as possible on the current
thread.
default Gets a scheduler that schedules work
via a timed callback based upon
platform.
TestScheduler Virtual time scheduler used for
testing applications and libraries built
using Reactive Extensions.
HistoricalScheduler Provides a virtual time scheduler that
uses a Date for absolute time and
time spans for relative time.

49. • callback hell
• promises
•
unsubscription/cancellation

50. • ReactiveX
• LearnRX
• RxJSKoans
• Rx Workshop
• IntroToRx

51. angelo.scotto@computer.org