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Tyrannosaurus Rx
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James Hughes
September 03, 2014
Programming
0
120
Tyrannosaurus Rx
Basic overview of Rx (Reactive Extensions)
James Hughes
September 03, 2014
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Transcript
TYRANNOSAURUS RX
REACTIVE EXTENSIONS
None
Java JS C# Clojure Groovy Scala Kotlin Python Ruby C++
Haskell
var list = [1,2,3,4,5,6,7]; ! for(var i = 0; i
< list.length; i++) { console.log(list[i]) }
var list = [1,2,3,4,5,6,7]; ! list.forEach(function(item) { console.log(item) })
var list = [Promise(), Promise()…]; ! list.forEach(function(item) { console.log(item.get()) })
TIME RUINS EVERYTHING
None
None
None
OBSERVABLES LISTS WITH TIME REIFIED EVENT STREAM PUSH BASED
CREATING OBSERVABLES ITERABLE FUTURE/PROMISE EVENTS RULES OBSERVABLE
CREATING OBSERVABLES Observable.from(new String[] { "The Joker", "The Riddler", "Penguin",
"Catwoman"})
CREATING OBSERVABLES baddies.subscribe((baddie) -> { out.println(baddie + “ is bad.”)
})
CREATING OBSERVABLES The Joker is bad. The Riddler is bad.
Penguin is bad. Catwoman is bad.
CREATING OBSERVABLES class _ extends Subscriber<String> { void onCompleted() {}
void onError(Throwable t) {} void onNext(String s){} }
CREATING OBSERVABLES onNext("The Joker”)
CREATING OBSERVABLES onNext("The Joker”) onNext("The Riddler”)
CREATING OBSERVABLES onNext("The Joker”) onNext("The Riddler”) onNext(“Penguin")
CREATING OBSERVABLES onNext("The Joker”) onNext("The Riddler”) onNext(“Penguin") onNext(“Catwoman")
CREATING OBSERVABLES onCompleted() onNext("The Joker”) onNext("The Riddler”) onNext(“Penguin") onNext(“Catwoman")
ERROR HANDLING onNext("The Joker”)
onNext("The Joker”) onNext("The Riddler”) ERROR HANDLING
X onNext("The Joker”) onNext("The Riddler”) ERROR HANDLING
X onNext("The Joker”) onNext("The Riddler”) onError(ex) ERROR HANDLING
TRANSFORMING OBSERVABLES TURN AN OBSERVABLE OF ONE TYPE INTO ANOTHER
TRANSFORMING OBSERVABLES Observable ints = Observable .interval(1, SECONDS); ! ints.map((i)
-> i + 1) .map((i) -> i + “ seconds”) .subscribe(out::println)
TRANSFORMING OBSERVABLES map map
TRANSFORMING OBSERVABLES 1 seconds 2 seconds 3 seconds 4 seconds
...
TRANSFORMING OBSERVABLES flatMap(), groupBy(), buffer(), window()
FILTERING OBSERVABLES SELECT AND REJECT ITEMS EMITTED BY AN OBSERVABLE
FILTERING OBSERVABLES var keys = Rx.DOM.keypress(el) var ints = keys.filter(isNumeric)
! ints.subscribe(console.log)
FILTERING OBSERVABLES filter X X
FILTERING OBSERVABLES distinct(), timeout(), ignoreElements(), throttleFirst(), debounce(), sample(), first(), last(),
take(), skip()
COMBINING OBSERVABLES COMPOSING MULTIPLE OBSERVABLES INTO A SINGLE OBSERVABLE
COMBINING OBSERVABLES Observable goodies = Observable.from( new String[]{ "Batman", "Robin",
"Alfred", “Batgirl"}); ! goodies.zipWith(baddies, (g,b) -> g + " punches " + b)
COMBINING OBSERVABLES zipWith
COMBINING OBSERVABLES Batman punches The Joker Robin punches The Riddler
Alfred punches Penguin Batgirl punches Catwoman
STUFF AND OTHER THINGS retry(), delay(), timestamp(), amb(), defaultIfEmpty(), reduce(),
count()
None
TYRANNOSAURUS RX