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PeterisP
on Oct 6, 2013
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Your server as a function [pdf]
It looks very similar to how yesod (
http://www.yesodweb.com/
,
http://www.yesodweb.com/book/basics
) routes/handlers are implemented - is that what you mean?
pka
on Oct 6, 2013
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Not quite - iirc Yesod still runs in some kind of IO monad, i.e. it is stateful. In contrast signal functions are declarative (pure).
colanderman
on Oct 7, 2013
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The IO monad is also declarative. But, just like FRP signal functions, functions in it can be used to describe stateful systems.
PeterisP
on Oct 6, 2013
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Interacting with a DB or reading a html file from disk is in essence non-pure.
pka
on Oct 7, 2013
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[1] is a good simple explanation of what FRP is about. A DB interaction for example can be viewed as a pure function from a signal of Requests to a signal of Records. Same with files (Signal Path -> Signal FileContents), etc.
[1]
http://elm-lang.org/learn/What-is-FRP.elm
tel
on Oct 7, 2013
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Despite not having gotten too deep into Yesod, I'd be surprised if they're similar. FRP is solving a very different problem than route handling.
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