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sshine/gist:10656899

Created April 14, 2014 15:11
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gistfile1.hs
replaceEs :: String -> String
-- One way
replaceEs ('e':cs) = 'a' : replaceEs cs
replaceEs (c:cs) = c : replaceEs cs
replaceEs [] = []
-- Or another
replaceEs [] = []
replaceEs (c:cs) =
case c of
'e' -> 'a' : replaceEs cs
_ -> c : replaceEs cs
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