Functional reactive programming
- Functional reactive programming
Functional reactive programming ("FRP" for short) is a programming paradigm for reactive programming using the building blocks of functional programming [cite web|author=Henrik Nilsson|title=Functional Reactive Programming Research|url=http://www.haskell.org/frp/|accessdate=2006-10-17] .
The key points of FRP are [cite web|title=usenet discussion|url=http://groups.google.com/group/flapjax/browse_thread/thread/2de4808143a5e751/5b1a6e4d6102e4e2?q=claird&rnum=5#5b1a6e4d6102e4e2] :
* Input is viewed as a "behavior", or time-varying stream of events
* Continuous, time-varying values
* Time-ordered sequences of discrete events
According to [http://wiki.opendylan.org/wiki/view.dsp?title=Functional%20Reactive%20Programming Peter van Roy] :
Functional Reactive Programming like functional programming except that each function can accept a stream of input values. If a new input value arrives on an argument, then the function is reevaluated with all the most recent input values and a new output value is created. This is a kind of dataflow programming. It can handle nondeterminism, so it is more expressive than declarative concurrency. In fact, it can be implemented with the declarative concurrent model extended with WaitTwo. (This means that it is similar in expressiveness to concurrent logic programming!)
References
See also
* Concepts, Techniques, and Models of Computer Programming
* Flapjax, an implementation for JavaScript
* JavaFX, a Java-based language with data binding feature (using the bind keyword)
External links
* [http://www.haskell.org/haskellwiki/Functional_Reactive_Programming Haskell related FRP research]
* [http://citeseer.ist.psu.edu/cooper04frtime.html FrTime] , a PLT Scheme implementation
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