他人のHaskell日記 RSSフィード

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。

2009-01-09

Haskellで自分の足を撃つ方法(抜粋/意訳) Haskellで自分の足を撃つ方法(抜粋/意訳) - 他人のHaskell日記 を含むブックマーク

(http://www.haskell.org/haskellwiki/Shooting_your_self_in_the_foot)

  • あなたは銃を発射した。しかし銃弾はIOモナドにからめとられた。
  • プログラムをコンパイルしようとしたら、コンパイラが型エラーを発生させ、それはカーネルバッファをオーバーフローするほど長かったために、トリガーコントロールレジスタを上書きし、足を撃つことになった。
  • 型エラーという暗号を解読しようとして、あなたの頭は爆発した。
  • 足を撃ったが、何も起きなかった。Haskellの世界では副作用は起きないのだ。
  • 足を撃とうとしたが、Gunというdatatypeが無かったため、変わりにArrowを使った。
  • 足を撃ったが完全に元気だ。足を評価するまでは。
  • 足を撃った。しかしSTM(Software Transactional Memory)モナドのなかにいるので、やりたいことがみつかるまでいつだってやりなおせる。

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