FRP - Release of reactive-banana version 0.4
I have released version 0.4.0.0 of my reactive-banana library on hackage.
Once again, I’ve improved the interaction with existing event-based frameworks. Namely, I’ve added a function
fromPoll :: IO a -> NetworkDescription (Behavior a)that creates a behavior from mutable data by polling. For instance, you can now obtain the text contents of an edit widget as a behavior. I’m actually embarrassed that I forgot to include this function right from the start. :-)
While the core FRP model and semantics remain unchanged, I have also
added a new data type Discrete, which denotes
discrete time-varying values. It’s very similar to
Behavior, except that it also provides an event
changes that records when the value changes. This can be
very useful when you want explicit control over updates, but the
drawback is, of course, that you have to deal with yet another data
type. See the documentation
for more on the rationale.
Many thanks to the user Masse for highlighting these issues by asking
questions
on stackoverflow
and to Conal Elliott for discussing the new Discrete data
type with me.
Other changes include:
- Name change:
runis now calledactuate - The new function
interpretAsHandleris a quick & easy way to write single event handlers in FRP style.