Read e-book online Functional Reactive Programming PDF

By Stephen Blackheath, Anthony Jones

Summary

Functional Reactive Programming teaches the recommendations and purposes of FRP. It bargains a cautious walk-through of center FRP operations and introduces the thoughts and methods you will need to take advantage of FRP in any language.

Purchase of the print booklet incorporates a unfastened publication in PDF, Kindle, and ePub codecs from Manning Publications.

About the Technology

Today's software program is transferring to extra asynchronous, event-based suggestions. for many years, the Observer development has been the go-to occasion infrastructure, however it is understood to be bug-prone. practical reactive programming (FRP) replaces Observer, considerably bettering the standard of event-based code.

About the Book

Functional Reactive Programming teaches you the way FRP works and the way to take advantage of it. you will commence via gaining an realizing of what FRP is and why it is so strong. Then, you are going to paintings via greenfield and legacy code as you discover ways to observe FRP to useful use situations. you will find examples during this ebook from many program domain names utilizing either Java and JavaScript. if you end up complete, one can use the FRP method within the structures you construct and spend much less time solving difficulties.

What's Inside

  • Think in a different way approximately facts and events
  • FRP suggestions for Java and JavaScript
  • Eliminate Observer one listener at a time
  • Explore Sodium, RxJS, and Kefir.js FRP systems

About the Reader

Readers desire intermediate Java or JavaScript talents. No event with sensible programming or FRP required.

About the Authors

Stephen Blackheath and Anthony Jones are skilled software program builders and the creators of the Sodium FRP library for a number of languages. Foreword by means of Heinrich Apfelmus. Illustrated via Duncan Hill.

Table of Contents

  1. Stop listening!
  2. Core FRP
  3. Some daily widget stuff
  4. Writing a true software
  5. New thoughts
  6. FRP on the net
  7. Switch
  8. Operational primitives
  9. Continuous time
  10. Battle of the paradigms
  11. Programming within the genuine global
  12. Helpers and styles
  13. Refactoring
  14. Adding FRP to current tasks
  15. Future directions

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Additional info for Functional Reactive Programming

Sample text

The class name Rule says what it is. The contained function’s name doesn’t need to add to this. The following listing is the logic of the main program. It implements the two business rules described using the new Rule class. DAY_OF_MONTH); return day == 4 || day == 14 || day == 24; } ... date); SButton ok = new SButton("OK", valid); Return can’t precede departure. Can’t travel on unlucky dates To run this example, check out the code with git if you haven’t done so already, and then run it. com/SodiumFRP/sodium cd sodium/book/swidgets/java mvn test -Pairline2 or ant airline2 Summary 25 This is a small example of an approach that becomes powerful as the problem gets more complex.

Without these ideas, FRP is just a way of taking something that should be straightforward and doing it in an eccentric, limiting way. The claimed benefits will be remote. We’re talking about standard functional programming ideas. If you’ve done functional programming, it will be easier to learn FRP. If not, that’s no problem. You don’t need to know everything about functional programming to use FRP, and we’ll teach you what you need to know. NOTE FRP made it easier for one of the authors to learn functional programming.

The code shouldn’t see or change the outside world, and therefore it should always give the same result for a given input. This may seem unnecessarily restrictive at first, but we need this restriction to guarantee compositionality, which is at the core of the benefits of FRP. Cheating—Using functions that aren’t referentially transparent in functional code (such as FRP). DEFINITION Can you cheat just a little? No, you can’t. It may be difficult to grasp this now, but we promise you’ll get a lot in return.

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