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Implementing Functional Reactive Programming in
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Remember this?
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Behaviour[T] = Time => T
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Event[T] = Stream[(Time, T)]
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Lets use them...
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val beh = new Behaviour(time => Color.red)
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beh.at(now)
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beh.at(now) def now = System.currentTimeMillis
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beh.map(val => val.toString)
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val event = new Event[Boolean]
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beh.until(event, beh1)
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“Hi!”.toggle(event, “Bye!”)
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“Hi!”.toggle(event, “Bye!”) ?
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implicit def lift[T](value : T) = { new Behaviour(time => value) }
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implicit def lift[T](value : T) = { new Behaviour(time => value) }
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So Far:
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So Far: - Core FRP: Behaviour/Event
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So Far: - Core FRP: Behaviour/Event - UI Framework
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So Far: - Core FRP: Behaviour/Event - UI Framework - I/O Framework
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Everything: http://github.com/oetzi/echo
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An example...
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No content
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val playButton = Button(button => "Play".toggle(button.click, "Pause"))
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val slider = Slider()
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val playing = false.toggle(playButton.click, true) val song = new Song(file, playing, slider.value)
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val anim = song.volume.map1(width) { (v, w) => math.min(v * (w / 50F), w) } val bouncer = Block(anim, height - 70, Color.green)
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val frame = Frame(width, height, List( bouncer, slider, playButton ))
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What if something goes wrong?
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class Dangerous extends Breakable { dangerous { () => break_everything() } }
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class Dangerous extends Breakable { dangerous { () => break_everything() } } val danger = new Dangerous() val err : Event[Exception] = danger.errors
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DOING IT LIVE
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Thank You!