Haskell:
complement :: Char -> Either String Char complement 'A' = Right 'T' complement 'T' = Right 'A' complement 'C' = Right 'G' complement 'G' = Right 'C' complement c = Left $ "invalid nucleic acid " ++ [c] dnaStrand :: String -> Either String String dnaStrand = sequence . map complement
Returns a Left value if there is a character other than AGTC
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Haskell:
Returns a Left value if there is a character other than AGTC