Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Dealing with streams using RxJs
Search
Hugo Cordier
June 05, 2015
Programming
8
2.6k
Dealing with streams using RxJs
Hugo Cordier
June 05, 2015
Tweet
Share
More Decks by Hugo Cordier
See All by Hugo Cordier
Reactive Programming with RxJava
hugocrd
1
280
Reactive Programming with RxJS
hugocrd
4
750
Recherche Géospatiale dans MongoDB
hugocrd
0
83
Other Decks in Programming
See All in Programming
WebGLで始める コンピュータグラフィックス入門
heller77
0
370
[RubyKaigi 2024] Ruby Mixology 101: adding shots of PHP, Elixir, and more
palkan
0
120
Runtime Objects in Rust
mitsuhiko
0
220
Three ways to use AI on Android: The Good, the Bad and the Ugly
marxallski
0
120
Criando a Woovi em uma semana
daniloab
0
120
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
1
120
『Railsオワコン』と言われる時代に、なぜブルーモ証券はRailsを選ぶのか
free_world21
2
480
Fragment Composition of GraphQL
quramy
14
1.7k
Prepare for Jakarta EE 11 - Performance and Developer Productivity
ivargrimstad
0
250
Direct Style Effect Systems The Print[A] ExampleA Comprehension Aid
philipschwarz
PRO
0
410
Good first issues of TypeProf
mame
3
550
otelcol receiver 自作RTA / Pepabo Tech Conference #22 春のSREまつり
arthur1
0
880
Featured
See All Featured
What the flash - Photography Introduction
edds
64
11k
Pencils Down: Stop Designing & Start Developing
hursman
117
11k
How to train your dragon (web standard)
notwaldorf
75
5.2k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
660
120k
Fantastic passwords and where to find them - at NoRuKo
philnash
39
2.5k
Clear Off the Table
cherdarchuk
86
310k
The Brand Is Dead. Long Live the Brand.
mthomps
49
30k
Web development in the modern age
philhawksworth
203
10k
Robots, Beer and Maslow
schacon
PRO
155
8k
Designing for Performance
lara
601
67k
The MySQL Ecosystem @ GitHub 2015
samlambert
244
12k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
34
6.1k
Transcript
Dealing with Streams using RxJS
Hello! I am Hugo Cordier Developer and CTO at Melusyn
Melusyn helps film makers to manage and organize their productions. You can find me at : @HugoCrd We are hiring! Drop me a line at
[email protected]
♥
1. What’s an event? Javascript is about events
What’s an event? DOM events clicks, moves, focuses, drags events
What’s an event? Async response Ajax, Websocket events
What’s an event? Timeout, interval Time related events
What’s an event? Solution Callbacks & Promises
2. What’s a stream? Give me use-cases!
What’s a stream? A stream is a group of events
What’s a stream? Double clicks How fast can you click?
What’s a stream? Keyboard Konami code is a must have
feature
What’s a stream? Synchronizing async responses Requesting several services
What’s a stream? Solution Reactive Extensions
3. What to do with it?
What to do with it? Transforming events in the Stream
What to do with it? Merging, mixing Several streams
What to do with it? Dealing with time Delaying events,
creating interval, ...
4. The Rx Model Observables and Operators
The Rx Model A stream is an Observable An Observable
push down events through Operators
The Rx Model Operators transform a stream They can be
used to transform, filter and mix events from an Observable
The Rx Model
The Rx Model
The Rx Model myObservable .map(value => value+1) .filter(value => value
> 2) Finally some code!
The Rx Model
The Rx Model myObservable .merge(anotherObservable) .map(value => value+1) .filter(value =>
value > 2)
The Rx Model
The Rx Model myObservable .flatMap(anotherObservable) .map(value => value+1)//Values from anotherObservable
.filter(value => value > 2)
There’s a whole bunch of Operators The Rx Model http://reactivex.io/documentation/operators.html
5. The Rx Model Subscribing and dealing with errors
An Observable needs to be subscribed The Rx Model The
stream will flow once it has been subscribed
The Rx Model myObservable .subscribe( value => console.log(“Event”+value), e =>
console.error(e) )
6. The Rx Model Creating Observables
How to create an Observable? The Rx Model
The Rx Model Rx.Observable .just(1) .from([1,5,0,12,4]) .fromEvent(domElement, event) .fromNodeCallback(nodeFct) .fromPromise(promise)
.interval(2000)
The Rx Model Rx.Observable.create(s => { for (value in values)
{ s.onNext(value) } s.onCompleted() })
7. In real life
In real life Live search Using Google Geocoder and RxJS
http://codepen.io/HugoCrd/pen/vOxQvM
In real life Composing streams Aggregate data from several requests
http://codepen.io/HugoCrd/pen/azGxdW
In real life Realtime statistics Ping a server each x
seconds and diplay results http://codepen.io/HugoCrd/pen/dPeaLY
8. In real life RxJS is just a library. Use
it with whatever you want
In real life with... Node.js Node uses Callbacks. They can
easily be used as a stream var rename = Rx.Observable.fromNodeCallback(fs.rename); rename('file1.txt', 'file2.txt') .map(...) .subscribe(...)
In real life with... Angular.js Angular $watch is a stream
of model changes Angular also has an eventbus system : events on a handler are a stream Rx.Observable.$watch(scope, 'name') .map(...) .subscribe(...)
In real life with... Backbone.js Binding to an object is
listening to it’s changes. This could be used as a stream. Rx.Observable.fromEvent(object, ‘click’) .map(...) .subscribe(...)
In real life with... JS Wokers A worker could post
messages to into stream Rx.DOM.fromWebWorker('worker.js') .map(...) .subscribe(...)
Thanks! Any questions? We are hiring! Drop me a line
at
[email protected]
or @HugoCrd ♥
This template is from SlidesCarnival