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.List (elemIndex) |
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import Data.Maybe (isJust) |
import Data.Maybe (isJust) |
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residue 'a' "bc" s |
residue 'a' "bc" s |
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>>= residue 'b' "c" |
>>= residue 'b' "c" |
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>>= |
>>= elemIndex 'c' |
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residue :: Char -> String -> String -> Maybe String |
residue :: Char -> String -> String -> Maybe String |
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