purescript-behaviors

An implementation of FRP which separates discrete values ("events") from continuous values ("behaviors").

• Example
• API Documentation

pulp build
npm run example

This library defines two type constructors:

• Event, which models discrete events like mouse clicks and key presses, and
• Behavior, which models continuous functions of time, like the current time or the mouse position.

The FRP.Event.* and FRP.Behavior.* modules provide several ways to construct events and behaviors, and these can be further combined by using the type class instances and functions which are provided.

Ultimately, we are interested in sampling events, which can be done using the subscribe function. However, behaviors can provide a more useful model for certain problems, since they are defined at every time, and support different operations such as integration and differentiation. A behavior must be sampled on some event in order to be useful, but the choice of sampling interval is delayed until as late as possible, which allows us to treat behaviors like actual functions of time.