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Haskell初心者が、リハビリがてらに「ふつける」と「入門Haskell」片手に、試行錯誤するサイト。

2009-01-01

Arrowが分からない。  Arrowが分からない。 - 他人のHaskell日記 を含むブックマーク

If your application works fine with monads, you might as well stick with them.But if you're using a structure that's very like a monad,but isn't one,maybe it's an arrow.


(Monadを使ってアプリケーションがちゃんと動いているのなら、それを使い続けた方がよい。しかし、もし極めてモナドに似ていて、Monadでないようなものに出会ったとしたら、それは恐らくArrowだ。)

http://www.haskell.org/arrows/

<モナデッィクなパーサーの最適化をしていたらモナドのインターフェイスと互換性が無くなってしまった例をあげ、それは特別な例ではないと言う>


While arrows are a little less convininet to use than monads.they have significantly wider applicability.They can therefore be used to bring the benefits of monad like programming to a much wider class of application.


(Arrowの便利さは少しMonadに劣るが、使用可能範囲は広い。だからモナド的プログラミングの利点を、より広い種類のアプリケーションに持ち込める)

http://www.cs.chalmers.se/~rjmh/Papers/arrows.pdf

必要になるまでは、使わなくてもいいってことかな。

しかし気になる

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