RxJS vs RxJava: Intro

Jan 17, 2016Download as pptx, pdf

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Introductory presentation for the Clash of Technologies: RxJS vs RxJava event organized by SoftServe @ betahouse (17.01.2015). Comparison document with questions & answers available here: https://docs.google.com/document/d/1VhuXJUcILsMSP4_6pCCXBP0X5lEVTsmLivKHcUkFvFY/edit#.

Agenda
• Reactive Programming
• Functional Reactive Programming
• RxJS
• RxJava

Reactive Programming
• In imperative programming languages
expressions are evaluated “in place”:
a = 10;
b = 20;
c = a + b; // c = 30
a = 40; // c = 30

Reactive Programming
• In reactive programming languages changes in
the data flow may trigger changes to multiple
variables:
a = 10;
b = 20;
c = a + b; // c = 30
a = 40; // c = 60

Reactive Programming
• Reactive programming may also refer to the
interaction between different systems or
components in a system
• In that regard the libraries we will be
discussing do not serve as a replacement of
message brokers (such as RabbitMQ, Kafka,
MSMQ and a number of others)

Reactive Programming
• In this clash we would refer to the
“programming language” - inferred meaning
behind reactive programming

Reactive Programming
• The Reactive Manifesto:

Functional Reactive Programming
• A more common subset is functional reactive
programming (FRP) that makes use of streams
and stream operations for anything (input,
changes in variables and many more) in order
to achieve reactiveness
• Connal Elliot – ground-breaking paper
@Conference on Functional Programming,
1997

Functional Reactive Programming
• Reactive Programming = Programming with
Asynchronous Data Streams
• Functional Reactive Programming (FRP) =
programming paradigm for reactive programming
that uses the building blocks of functional
programming (e.g. map, reduce, filter). FRP has been
used for programming graphical user interfaces
(GUIs), robotics, and music, aiming to simplify these
problems by explicitly modeling time. [Wikipedia]

Functional Reactive Programming
• FRP has been used in:
– responsive graphical user interfaces (GUIs)
– robotics
– the music industry

Functional Reactive Programming
• RxJava and RxJS implement the functional
reactive programming paradigm in terms of
libraries for the Java and JavaScript
programming languages correspondingly …
• Derived on the basis of Microsoft’s Reactive
Extensions (Rx) library for .NET

Functional Reactive Programming
Microsoft® open source polyglot project ReactiveX
(Reactive Extensions) [http://reactivex.io]:
Rx = Observables + LINQ + Schedulers :)
• Supported Languages – Java: RxJava, JavaScript: RxJS, C#:
Rx.NET, C#(Unity): UniRx, Scala: RxScala, Clojure:
RxClojure, C++: RxCpp, Ruby: Rx.rb, Python: RxPY, Groovy:
RxGroovy, JRuby: RxJRuby, Kotlin: RxKotlin, Swift: RxSwift
• ReactiveX for platforms and frameworks: RxNetty,
RxAndroid, RxCocoa

Functional Reactive Programming
• Rx has an implicit contract that must be
followed:
event source
OnNext(item) OnNext(item) OnNext(item)
OnCompleted()
OnError(Exception)

RxJava
• Lambdas and streams introduced in Java 8
make the FRP style of programming in Java
easier to accomplish
• There is a proposal for introducing a reactive
streaming API as part of the core libraries in
JDK 9

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RxJS vs RxJava: Intro

1. RxJS vs RxJava Intro

2. Agenda • Reactive Programming • Functional Reactive Programming • RxJS • RxJava

3. Reactive Programming

4. Reactive Programming • In imperative programming languages expressions are evaluated “in place”: a = 10; b = 20; c = a + b; // c = 30 a = 40; // c = 30

5. Reactive Programming • In reactive programming languages changes in the data flow may trigger changes to multiple variables: a = 10; b = 20; c = a + b; // c = 30 a = 40; // c = 60

6. Reactive Programming • Reactive programming may also refer to the interaction between different systems or components in a system • In that regard the libraries we will be discussing do not serve as a replacement of message brokers (such as RabbitMQ, Kafka, MSMQ and a number of others)

7. Reactive Programming • In this clash we would refer to the “programming language” - inferred meaning behind reactive programming

8. Reactive Programming • The Reactive Manifesto:

9. Functional Reactive Programming

10. Functional Reactive Programming • A more common subset is functional reactive programming (FRP) that makes use of streams and stream operations for anything (input, changes in variables and many more) in order to achieve reactiveness • Connal Elliot – ground-breaking paper @Conference on Functional Programming, 1997

11. Functional Reactive Programming • Reactive Programming = Programming with Asynchronous Data Streams • Functional Reactive Programming (FRP) = programming paradigm for reactive programming that uses the building blocks of functional programming (e.g. map, reduce, filter). FRP has been used for programming graphical user interfaces (GUIs), robotics, and music, aiming to simplify these problems by explicitly modeling time. [Wikipedia]

12. Functional Reactive Programming • Reactive Programming = Programming with Asynchronous Data Streams • Functional Reactive Programming (FRP) = programming paradigm for reactive programming that uses the building blocks of functional programming (e.g. map, reduce and filter)

13. Functional Reactive Programming • FRP has been used in: – responsive graphical user interfaces (GUIs) – robotics – the music industry

14. Functional Reactive Programming • RxJava and RxJS implement the functional reactive programming paradigm in terms of libraries for the Java and JavaScript programming languages correspondingly … • Derived on the basis of Microsoft’s Reactive Extensions (Rx) library for .NET

15. Functional Reactive Programming Microsoft® open source polyglot project ReactiveX (Reactive Extensions) [http://reactivex.io]: Rx = Observables + LINQ + Schedulers :) • Supported Languages – Java: RxJava, JavaScript: RxJS, C#: Rx.NET, C#(Unity): UniRx, Scala: RxScala, Clojure: RxClojure, C++: RxCpp, Ruby: Rx.rb, Python: RxPY, Groovy: RxGroovy, JRuby: RxJRuby, Kotlin: RxKotlin, Swift: RxSwift • ReactiveX for platforms and frameworks: RxNetty, RxAndroid, RxCocoa

16. Functional Reactive Programming • Rx has an implicit contract that must be followed: event source OnNext(item) OnNext(item) OnNext(item) OnCompleted() OnError(Exception)

17. RxJS

18. RxJs Rx.Observable.from(["Reactive", "Extensions", "Java“]) .take(2) .map(function(s) { s + " : on " + new Date()}) .subscribe(function(s) {console.log(s)}); Result: Reactive : on Wed Jun 17 21:54:02 GMT+02:00 2015 Extensions : on Wed Jun 17 21:54:02 GMT+02:00 2015

19. RxJava

20. RxJava Observable.from(new String[] {"Reactive", "Extensions", "Java"}) .take(2) .map(s -> s + " : on " + new Date()) .subscribe(s -> System.out.println(s)); Result: Reactive : on Wed Jun 17 21:54:02 GMT+02:00 2015 Extensions : on Wed Jun 17 21:54:02 GMT+02:00 2015

21. RxJava • Lambdas and streams introduced in Java 8 make the FRP style of programming in Java easier to accomplish • There is a proposal for introducing a reactive streaming API as part of the core libraries in JDK 9

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