John Ky said: > Does that mean there is no place to store state while running the > interpreter [...]?
If all you are doing is experimenting at the GHCi prompt, then maybe this is what you are missing: ...> moo <- newTVarIO 1 ...> :t moo moo :: TVar Integer ...> atomically (readTVar moo) 1 ...> You can also perform "let"-bindings: ...> let incr v = readTVar v >>= writeTVar v . (+1) ...> :t incr incr :: (Num a) => TVar a -> STM () ...> atomically (incr moo) ...> atomically (readTVar moo) 2 ...> For the details, see the GHC reference. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
