Implementing Functional Reactive Programming in Scala - Progress Presentation

A presentation showing the capabilities of my current FRP framework

1. Implementing Functional Reactive Programming in
2. Remember this?
3. Behaviour[T] = Time => T
4. Event[T] = Stream[(Time, T)]
5. Lets use them...
6. val beh = new Behaviour(time => Color.red)
7. beh.at(now)
8. beh.at(now) def now = System.currentTimeMillis
9. beh.map(val => val.toString)
10. val event = new Event[Boolean]
11. beh.until(event, beh1)
12. “Hi!”.toggle(event, “Bye!”)
13. “Hi!”.toggle(event, “Bye!”) ?
14. implicit def lift[T](value : T) = { new Behaviour(time => value) }
15. implicit def lift[T](value : T) = { new Behaviour(time => value) }
16. So Far:
17. So Far: - Core FRP: Behaviour/Event
18. So Far: - Core FRP: Behaviour/Event - UI Framework
19. So Far: - Core FRP: Behaviour/Event - UI Framework - I/O Framework
20. Everything: http://github.com/oetzi/echo
21. An example...
23. val playButton = Button(button => "Play".toggle(button.click, "Pause"))
24. val slider = Slider()
25. val playing = false.toggle(playButton.click, true) val song = new Song(file, playing, slider.value)
26. val anim = song.volume.map1(width) { (v, w) => math.min(v * (w / 50F), w) } val bouncer = Block(anim, height - 70, Color.green)
27. val frame = Frame(width, height, List( bouncer, slider, playButton ))
28. What if something goes wrong?
29. class Dangerous extends Breakable { dangerous { () => break_everything() } }
30. class Dangerous extends Breakable { dangerous { () => break_everything() } } val danger = new Dangerous() val err : Event[Exception] = danger.errors
31. DOING IT LIVE
32. Thank You!