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<< 2009/12/24
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2009/12/26 >>
2009/12/25 19:53:06 UTC
nwn
#
最初に Just を返す IO を探す :: [IO (Maybe a)] -> IO (Maybe a)
http://gist.github.com/263730
2009/12/25 20:16:44 UTC
nwn
#
そういえば、Maybe a を 2 つとって Just の方をとる/両方 Nothing なら Nothing になるっていう関数を自前で定義しているのを結構見たことある気がする
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