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
2.8k
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
310
Reactive Programming with RxJS
hugocrd
4
770
Recherche Géospatiale dans MongoDB
hugocrd
0
97
Other Decks in Programming
See All in Programming
つよそうにふるまい、つよい成果を出すのなら、つよいのかもしれない
irof
1
300
「ElixirでIoT!!」のこれまでとこれから
takasehideki
0
370
無関心の谷
kanayannet
0
180
レガシーシステムの機能調査・開発におけるAI利活用
takuya_ohtonari
0
610
Julia という言語について (FP in Julia « SIDE: F ») for 関数型まつり2025
antimon2
3
970
赤裸々に公開。 TSKaigiのオフシーズン
takezoux2
0
140
Java on Azure で LangGraph!
kohei3110
0
160
Webの外へ飛び出せ NativePHPが切り拓くPHPの未来
takuyakatsusa
1
170
来たるべき 8.0 に備えて React 19 新機能と React Router 固有機能の取捨選択とすり合わせを考える
oukayuka
2
820
Create a website using Spatial Web
akkeylab
0
290
Effect の双対、Coeffect
yukikurage
5
1.4k
Haskell でアルゴリズムを抽象化する / 関数型言語で競技プログラミング
naoya
17
4.8k
Featured
See All Featured
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
31
1.2k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.7k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
331
22k
For a Future-Friendly Web
brad_frost
179
9.8k
The Pragmatic Product Professional
lauravandoore
35
6.7k
Building a Modern Day E-commerce SEO Strategy
aleyda
41
7.3k
4 Signs Your Business is Dying
shpigford
184
22k
Into the Great Unknown - MozCon
thekraken
39
1.9k
Become a Pro
speakerdeck
PRO
28
5.4k
Rails Girls Zürich Keynote
gr2m
94
14k
Product Roadmaps are Hard
iamctodd
PRO
53
11k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
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