[Haskell-cafe] ANN: Elerea, another FRP library

Peter Verswyvelen bugfact at gmail.com
Sat Apr 11 08:47:01 EDT 2009

Any idea how Elerea compares to Grapefruit? It's great to see a lot of
competition in the FRP arena, but I hope in the end this results in a really
usable and scalable FRP system for Haskell :-)

2009/4/11 Patai Gergely <patai_gergely at fastmail.fm>

> > An other interesting approach to FRP is frtime (in Scheme):
> > http://www.cs.brown.edu/~sk/Publications/Papers/Published/ck-frtime/
> > There should be a second paper than this one, I have just forget its
> > reference.
> Elerea is a bit similar, since it also maintains the connections between
> signals explicitly. However, its evaluation is a backward chaining
> process starting from the top-level signal, only affecting the nodes it
> depends on transitively. Only stateful signals need to be mutated and
> reevaluated whenever the top level is sampled (to avoid time and space
> leaks). Constants, pure functions and function application nodes always
> stay the same, and they are lazily evaluated. Peripheral bound external
> signals are also static from the point of view of the evaluator, and it
> is the responsibility of the environment to update them.
> Gergely
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