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This documents my foray into Haskell programming. My functional programming language of choice is, for the moment, Racket (specifically Typed Racket), and while Iâve always been interested in Haskell, Iâve never taken the time to learn it properly. This is heavily inspired by Learning Racket, a fun series which is, in pretty much all respects, the direct reversal of this. Iâm not sure how long Iâl
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Haskellã§ã®åæå¯è½ãªãªãã¸ã§ã¯ãã®æ§æã¨ãã®å¿ç¨ æ¨ä¸éç« , å±±æ¬å彦, 2015 Haskellã§ç¶æ ã管çããéã¯ã ä¸è¬çã«ä»£æ°ãã¼ã¿åãåã¯ã©ã¹ãç¨ãããããã ãã¼ã¿ãæ¡å¼µã§ããªãããåçãªæ§è³ªãæããªãã ãã®ããHaskellã¯ã è¤éãªç¶æ ãæ±ãåé¡é åã«ã¯é©ãã¦ããªãã¨èãããã¦ããã ä¸æ¹ã§ãä¸è¬çãªãªãã¸ã§ã¯ãæåè¨èªã§ã¯ã ãªãã¸ã§ã¯ããæä¾ãããã¨ã§ãã®åé¡é åã§æåãåãã¦ããã æ¬è«æã§ã¯ãHaskellã®è¨èªä»æ§ãå¤æ´ãããã¨ãªãã«ã ãªãã¸ã§ã¯ãæåè¨èªããçæ³ãå¾ããªãã¸ã§ã¯ããå®ç¾ããã æ¬è«æã§ææ¡ãããªãã¸ã§ã¯ãã¯åãæ§æããåæãç¨ãã¦ç¶æ¿ã表ç¾ã§ããã ã¾ããçµäºããéå½ã«ãããªãã¸ã§ã¯ããã¹ããªã¼ãã³ã°ãªã©ã«å¿ç¨ã§ãã è¤éãªç¶æ ãæ±ãã²ã¼ã ã®å®è£ ã«ã使ããã¦ããã è«æããã¦ã³ãã¼ã(PDF) PPL 2015 çºè¡¨ã¹ã©ã¤ã ããã«
åå¼·ä¼ã«è¡ã£ãããããã°ãæ¬ãèªãã ããããããããã©ãã¢ããã£ã¦ãªããªããããã(´ã»Ïã»`) ç¶æ ã ã£ãåã§ãããå解ãã¦ãå³è§£ãã¦ã¿ããå°ãããã£ãæ°ãããã®ã§ãã¨ã³ããªã¼ãã¦ã¿ãã ãããã°ã©ãã³ã°Haskellãã®P106ã«ããã¨ãIOã¢ããã¨ã¯ã以ä¸ã®å½¢ããã¦ããããã*1ã type IO a = World -> (a, World) ããã¦ã次ã®ãã¼ã¸ã«ãã¤ã³ã(>>=)ã®å®è£ ã以ä¸ã®ããã«æ¸ããã¦ããã (>>=) :: IO a -> (a -> IO b) -> IO b f >>= g = \ world -> case f world of (v, world') -> g v world' ã¯ããä¸æ°ã«ã®ã¢ãä¸ããã¾ãããã(´ã»Ïã»`) å ¨ç¶åãããªãã(´ã»Ïã»`) ã¨ãããã¨ã§ããããå解ãã¦å³è§£ããã®ããã®ã¨ã³ããªã¼ã®è¶£æ¨ã§ãã IO a ã«ã¤ã㦠ã¾
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