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

Patai Gergely patai_gergely at fastmail.fm
Sat Apr 11 06:10:01 EDT 2009

> 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.


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