Haskell ã§ã®ãƒ‡ãƒãƒƒã‚° - ã‚ã©ã‘ãªã„話「純粋関数型言語ã¯ãƒ‡ãƒãƒƒã‚°ã—ã«ãã„。ã ã£ã¦ç´”粋ãªé–¢æ•°ã§ printf デãƒãƒƒã‚°ã§ããªã„ã‹ã‚‰ã€ã¨ã¤ã¶ã‚„ã„ã¦ã„る人をよã見ã‹ã‘ã¾ã™ã€‚ã“ã‚Œã¾ã§æ”¾ç½®ã—ã¦ãã¾ã—ãŸãŒã€ãƒªãƒ„イートãŒ50を超ãˆãŸã®ã§ã€Haskellã§ã®ãƒ‡ãƒãƒƒã‚°ã«ã¤ã„ã¦æ›¸ãã¾ã™ã€‚ 例外処ç†ã¨åŒã˜ã‚ˆã†ã«ã€Haskell ã§ã®ãƒ‡ãƒãƒƒã‚°ã§ã¯ã€ç´”粋ãªé–¢æ•°ã¨ IO を分ã‘ã¦è€ƒãˆã‚‹å¿…è¦ã‚ã‚Šã¾ã™ã€‚ IO ã§ã® printf デãƒãƒƒã‚° IO ã§ã¯ã€putStrLn ã‚„ print ãŒä½¿ãˆã‚‹ã‹ã‚‰å•é¡Œãªã„ã§ã™ã‚ˆã？ foo :: Int -> IO Bool foo i = do x <- ã‚ã‚Œã—㦠i putStrLn $ "x = " ++ show x ã“ã‚Œã—㦠putStrLn "ã“ã“も通éŽ" -- ãれもã™ã‚‹ y <- ãれもã™ã‚‹ print y return y ã¡ãªã¿ã«ã€forkIO èµ·å‹•ã—ãŸè»½é‡ã‚¹ãƒ¬ãƒƒãƒ‰ã‹ã‚‰ putStrLn ã™ã‚‹å ´åˆã€è»½é‡ã‚¹
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