Haskellã®Stateモナドを定義ã‹ã‚‰ç†è§£ã™ã‚‹ - logicoffee プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°å‹‰å¼·æ—¥è¨˜æœ¬è¨˜äº‹ã®ç›®çš„ 解説 Stateモナドã®å®šç¾© ã²ã¨ã¤ã®è£œé¡Œ コードをèªã¿è§£ã„ã¦ã„ã ã¾ãšã¯éƒ¨åˆ†çš„ã« ãã—ã¦å…¨ä½“㸠ã¾ã¨ã‚ 本記事ã®ç›®çš„ Stateモナドã®æŒ™å‹•ã‚’定義ã‹ã‚‰å°Žå‡ºã—ãŸã„. ãã‚ŒãŒæœ¬è¨˜äº‹ã®ç›®æ¨™ã§ã™. Stateモナドã«ã¤ã„ã¦èª¿ã¹ã‚‹ã¨, ã„ãã¤ã‹ã®è¨˜äº‹ãŒãƒ’ットã—ã¾ã™. ãã“ã§ã¯Stateモナドã®ä½¿ã„æ–¹ã¨ã—ã¦ä»¥ä¸‹ã®ã‚ˆã†ãªã‚µãƒ³ãƒ—ルコードãŒå¼•ãåˆã„ã«å‡ºã•ã‚Œã‚‹ã“ã¨ãŒå¤šã„ã§ã—ょã†. import Control.Monad.State pickHead :: State [Int] Int pickHead = do x:xs <- get -- 状態(æ•´æ•°ã®ãƒªã‚¹ãƒˆ)ã‚’å–å¾— put xs -- å…ˆé 以外ã®éƒ¨åˆ†ã‚’æ–°ãŸãªçŠ¶æ…‹ã¨ã—ã¦ã‚»ãƒƒãƒˆ return x -- å…ˆé を返㙠sumHeads :: State [Int] Int sumHeads = do x <- pickHead -- å…ˆé ã‚’å–å¾—
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社内Haskellãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã®ã‚¹ã‚¹ãƒ¡ | GREE Engineering
関数型言語ã¨ä¸¦è¡Œå‡¦ç† Haskellã§ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚° 2013.5.24 山本和彦
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