ABC words: Difference between revisions
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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<lang haskell>import Data. |
<lang haskell>import Data.Bool (bool) |
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import Data.Maybe (isJust) |
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------------------------ ABC WORDS ----------------------- |
------------------------ ABC WORDS ----------------------- |
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isABC s = |
isABC s = |
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isJust $ |
isJust $ |
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residue 'a' "bc" s |
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>>= |
>>= residue 'b' "c" |
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>>= |
>>= (bool Nothing . Just) <*> ('c' `elem`) |
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residue :: Char -> String -> String -> Maybe String |
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residue c except = go |
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where |
where |
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go [] = Nothing |
go [] = Nothing |
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