Haskell ã®ãƒ‡ãƒ¼ã‚¿æ§‹ç¯‰å - ã‚ã©ã‘ãªã„話Haskell ã®ä»£æ•°ãƒ‡ãƒ¼ã‚¿åž‹ã§ä½¿ã‚れるデータ構築åã¯ã€å®Ÿã¯é–¢æ•°ã¨åŒæ§˜ã«æ‰±ãˆã¾ã™ã€‚ãŸã¨ãˆã°ã€å››å‰‡æ¼”ç®—ã®å¼ã‚’表ã™ä»£æ•°ãƒ‡ãƒ¼ã‚¿åž‹ã‚’以下ã®ã‚ˆã†ã«å®šç¾©ã—ãŸã¨ã—ã¾ã™ã€‚ data Expr = C Int | Add Expr Expr | Sub Expr Expr | Mul Expr Expr | Div Expr Expr deriving Show "1 + 2" 㯠"Add (C 1) (C 2)" ã¨è¡¨ç¾ã§ãã¾ã™ã€‚ã“ã®å¼ã‚’評価ã—ã¦ã¿ã¾ã—ょã†ã€‚ Add (C 1) (C 2) → Add (C 1) (C 2) 当ãŸã‚Šå‰ã§ã™ãŒã€ãã®ã‚‚ã®ãŒè¿”ã£ã¦ãã¾ã™ã€‚ 話ã¯å¤‰ã‚ã‚Šã¾ã™ãŒã€add ã¨ã„ã†é–¢æ•°ã‚’ç´ ç›´ã«å®šç¾©ã™ã‚‹ã¨ã€ã“ã†ãªã‚‹ã§ã—ょã†ã€‚ add x y = x + y å¼ "add 1 2" を評価ã™ã‚‹ã¨ã“ã†ãªã‚Šã¾ã™ã€‚ add 1 2 → 3 ã™ãªã‚ã¡ã€é–¢æ•°ã§ã‚ã‚Œã°ç°¡ç•¥åŒ–ã•ã‚Œã¾ã™ãŒã€ãƒ‡ãƒ¼ã‚¿æ§‹ç¯‰åã§ã‚
Monadius - a scientist's toy box
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