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** [ Developer Blog]
** [ Developer Blog]
* <span id="feedback">Feedback</span> and Contact
* <span id="feedback">Feedback</span> and Contact
** Maintainer: [ Heinrich Apfelmus] <apfelmus at quantentunnel de>
** Maintainer: [ Heinrich Apfelmus]
** Bugs and feature requests? [ Issue Tracker!]
** Bugs and feature requests? [ Issue Tracker!]
** Questions? [ Ask on StackOverflow!]
** Questions? [ Ask on StackOverflow!]
** More questions? [mailto:apfelmus%20at%20quantentunnel%20de Email] or [ live help]!
* Source code on github
* Source code on github
** [ reactive-banana] development branch
** [ reactive-banana] development branch

Revision as of 18:38, 29 October 2014


1 What is it?

Reactive banana displaying trigger-happy Behavior.

Reactive-banana is a library for Functional Reactive Programming (FRP).

FRP offers an elegant and concise way to express interactive programs such as graphical user interfaces, animations, computer music or robot controllers. It promises to avoid the spaghetti code that is all too common in traditional approaches to GUI programming.

The goal of the library is to provide a solid foundation.

  • Writing graphical user interfaces with FRP is made easy. The library can be hooked into any existing event-based framework like wxHaskell or Gtk2Hs. A plethora of example code helps with getting started. You can mix FRP and imperative style. If you don't know how to express functionality in terms of FRP, just temporarily switch back to the imperative style.
  • Programmers interested in the implementation of FRP will have a reference for a simple semantics with a working implementation. The library stays close to the semantics pioneered by Conal Elliott.
  • The library features an efficient implementation. No more spooky time leaks, predicting space & time usage should be straightforward.

Feedback is welcome, I want to hear from you!

2 Status

Current development focuses on performance. Applications to GUI programming are explored in the sister project threepenny-gui.

  • 29 January 2014: reactive-banana released.
  • 21 November 2013: reactive-threepenny-gui deprecated again, because threepenny-gui now has its own FRP subsystem built-in.
  • 02 August 2013: Initial release of reactive-banana-threepenny. Binds to the threepenny-gui GUI library.
  • 26 August 2012: reactive-banana released. Features dynamic event switching.
  • 15 May 2012: reactive-banana released.
  • 25 March 2012: reactive-banana released.
  • 24 October 2011: reactive-banana released.
  • 26 September 2011: Added some more examples, reactive-banana released.
  • 14 July 2011: Implemented many examples, reactive-banana released.
  • 22 June 2011: reactive-banana released
  • 28 April 2011: reactive-banana released

3 Fake Testimonials

"In the programming-language world, one rule of survival is simple: dance or die. This library makes dancing easy." – Simon Banana Jones

"About the use of language: it is impossible to sharpen a pencil with a blunt axe. You should try reactive-banana instead." — Event Dijkstra

"When I need a bullet event, I can just trigger it." — Billy the Reactive Banana

"This should be in a museum!" — Banana Jones

"Hey Mister! Why not use reactive-banana as a smartphone app to brush your teeth?" — Tommy "Banana" Johnson

4 Releases and Resources

5 External Links