mzp https://blog.hatena.ne.jp/mzp/ みずぴー日記 https://mzp.hatenadiary.org/ Haskell Arrow Arrow.hsを読もう〜その1〜 - みずぴー日記の続き。Arrow.hsを読もう、30分で読める範囲だけ。 ArrowApply instance ArrowApply (->) where app (f,x) = f x 単なる適用。(->)以外だと嬉しいんだろう、たぶん。 leftApp -- | Any instance of 'ArrowApply' can be made into an instance of -- 'ArrowChoice' by defining 'left' = 'leftApp'. leftApp :: ArrowApply a => a b c -> … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmzp.hatenadiary.org%2Fentry%2F20090207%2Farrow" title="Arrow.hsを読もう〜その2〜 - みずぴー日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-02-07 00:00:01 rich https://mzp.hatenadiary.org/entry/20090207/arrow 1.0 100%