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1つの Applicative フィールド値を複数の場所で使いまわす

Haskell
yesod

Posted at 2013-02-04

例：1つのテキストフィールドの値を1,2,3文字目からなるタプルに変換

sampleForm :: Form (Char, Char, Char)
sampleForm = renderDivs $ ((,,)
    <$> (!! 0) . unpack
    <*> (!! 1) . unpack
    <*> (!! 2) . unpack
    ) <$> areq textField "text" Nothing

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