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Reactive-banana is a library for Functional Reactive Programming (FRP), written in Haskell.

Support the project with a small donation:

See the project homepage for documentation, examples and so on.

To build and install the core library from the source repository, simply type

cd reactive-banana && cabal install && cd ..

However, to try out the GUI examples, you have to install one of the of the additional packages.

Prerequisites: the wxHaskell package

cabal install wx

Note that you need to have a development version of the wxWidgets libraries installed before building wx. If you run into ExitFailure 1 exceptions, please follow the wxHaskell Quick Start instructions and try again.

To build the wx examples, type

cd reactive-banana-wx
cabal configure -fbuildExamples && cabal build
cd ..

The project contains several directories:

• reactive-banana — the core library
• reactive-banana-wx — bindings to the wxHaskell GUI library, includes many examples

The reactive-banana library actually contains two FRP implementations:

1. Reactive.Banana.Model - A model implementation for testing and understanding the semantics. You are encouraged to look at the source code.
2. Reactive.Banana.Prim - The efficient push-driven implementation used for production code. Contains hard to understand trade secrets. ;-)

Send me your examples, bindings, problems, suggestions, etc!

With contributions from

• Abu Alam
• Alexander Berntsen
• Kevin Cantu
• Gregory Crosswhite
• Elliott Hird
• John Lato
• Gideon Sireling
• Henning Thielemann
• Daniel Werner