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seanhess/ListWriter.hs

Created January 13, 2012 21:18
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ListWriter.hs
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ListWriter.hs
data ListWriter = ListWriter [String]
runListWriter :: ListWriter -> [String]
runListWriter (ListWriter xs) = xs
execListWriter :: ListWriter -> [String]
execListWriter = runListWriter
instance Monad ListWriter where
return a = ListWriter []
ListWriter xs >>= f = ListWriter xs ++ ys
where ListWriter ys = f
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