almost-fix alternatives and similar packages
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README
almost-fix
Combinators for predicative recursion
Usage
Simple Predicative Recursion
Say you want to perform f until some boolean test b:
almostFix b f
will run f until b returns False.
almostFix True f ~ f . f . f ...
Monadic Predicates
Say you've got a monadic step f :: a -> m a, and some boolean test in the
monad b :: m Bool - a good example of this would be in a MonadState Integer m
stateful monad, and the monadic predicate liftM (< 5) get :: m Bool. Now, we
bind until the predicate is falsified:
exclaimAgain :: MonadState Integer m => String -> m String
exclaimAgain a = do modify (+1)
return (a ++ "!")
exclaimFive :: String -> String
exclaimFive s = evalState (almostFix (liftM (<= 5) get) exclaimAgain s) 1