Hi, I've found Sasha's example

import FRP.Reactive import FRP.Reactive.LegacyAdapters import Control.Concurrent type BellMachine = Event () -> Event () doorBell :: BellMachine doorBell = id runMachine :: BellMachine -> IO () runMachine machine = do -- get button press clock <- makeClock (buttonPressed, buttonPressedSink) <- makeEvent clock forkIO $ buttonPresses buttonPressedSink adaptE (fmap bell $ machine buttonPressed) -- run the machine where bell = const $ print "beep!" buttonPresses sink = sequence_ $ repeat $ (getChar >> sink ()) main = runMachine doorBell

and it fits my purposes, but notice that the values collected from the makeEvent function must be in reverse order, at least with reactive-0.11.

(buttonPressedSink, buttonPressed) <- makeEvent clock

Regards, Alvaro. ---------- Mensaje reenviado ---------- De: Álvaro García Pérez Fecha: 8 de junio de 2009 11:57 Asunto: First steps in FRP Para: reactive@haskell.org Hello, I'm new to FRP and I'm trying to write a simple program adapting the events to IO. I've read the tutorial "Introducing Reactive: Events" but it's not very clear how to do it. Can someone send me an example? I would like to capture events from IO (let's say, keyboard strokes) and print text in the console. I'm using the last version of the reactive package. Thanks, Alvaro.