Created
June 22, 2013 07:14
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head/tailをMaybeにしてみた
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| safeHead :: [a] -> Maybe a | |
| safeHead [] = Nothing | |
| safeHead (x:_) = Just x | |
| safeTail :: [a] -> Maybe [a] | |
| safeTail [] = Nothing | |
| safeTail (_:xs) = Just xs |
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