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miguel-vila/mutability-in-haskell.hs

Created April 19, 2015 20:55
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mutability-in-haskell.hs
import Data.IORef
readAndPrint :: IORef Int -> IO ()
readAndPrint ioRef = do
n <- readIORef ioRef
print $ "ioRef = " ++ show n
main = do
ioRef <- newIORef 3
readAndPrint ioRef -- "ioRef 3"
modifyIORef ioRef (+2)
readAndPrint ioRef -- "ioRef 5"
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