Haskell ã§ãƒ‡ãƒ¼ã‚¿ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’ç½®ãæ›ãˆã‚‹é«˜éšŽé–¢æ•° - reduce ã«ã¤ã„ã¦èª¤è§£ã—ã¦ã„ãŸã“ã¨0. 目次： 1. 型を処ç†ã™ã‚‹é«˜éšŽé–¢æ•°ã‚’考ãˆã‚‹è¦–点 2. リストã®ãƒ‡ãƒ¼ã‚¿ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’ç½®ãæ›ãˆã‚‹é–¢æ•° a. reduceList 関数ã®å®šç¾© b. reduceList ã§è¦ç´ を足ã—上ã’ã‚‹ c. reduceList ã§åŒã˜å€¤ã‚’返㙠d. reduceList ã‹ã‚‰ map 関数を導ã e. reduceList ã‹ã‚‰ filter 関数 f. 述語を満ãŸã™è¦ç´ ã«ã€ç‰¹å®šã®é–¢æ•°ã‚’é©ç”¨ã™ã‚‹ g. reduceList ã‹ã‚‰ãƒªã‚¹ãƒˆã‚’çµåˆã™ã‚‹é–¢æ•° h. reduceList ã§ãƒªã‚¹ãƒˆã‚’é€†é †ã«ã™ã‚‹é–¢æ•° i. Haskell ã®æ¨™æº–ライブラリã«ã‚ã‚‹ foldr 3-1. 二分木ã§ãƒ‡ãƒ¼ã‚¿ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’ç½®ãæ›ãˆã‚‹é–¢æ•° (1) – å·¦å³ã®åãŒå¿…ãšã‚ã‚‹å ´åˆ a. reduceBinaryTree 関数ã®å®šç¾© b. reduceBinaryTree 関数ã‹ã‚‰ã€map, filter 関数を導ã 3-2.
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