畳ã¿è¾¼ã¿é–¢æ•°ã®æ¯”較 (fold / accumulate / inject / reduce) - blanket logã¤ãƒ¼ã‹ã€fold ã®å¼±ç‚¹ã¨ã—ã¦ã€è¨€èªžã«ã‚ˆã£ã¦å¼•æ•°ã®é †ç•ªãŒã¾ã¡ã¾ã¡ã§ã€ æ£ç›´æ†¶ãˆãã‚Œãªã„ã£ã¦ã®ãŒã‚ã‚‹ã‚“ã よãªã€‚誰ã‹å¯¾å¿œè¡¨ã¨ã‹ä½œã£ã¦ãれんもんã‹ã€‚ jijixi's diary - fold, map, for-each ã“ã®ä¸ã‹ã‚‰ä¸€ã¤é¸ã¶ã¨ã—ãŸã‚‰ã©ã‚Œï¼Ÿ 確ã‹ã«ã„ã‚ã„ã‚ã¨ã‚„ã‚„ã“ã—ã„ã®ã§ã¾ã¨ã‚ã¦ã¿ã¾ã—ãŸã€‚ ã„ãã¤ã‹ã®è¨€èªžã«ã¤ã„ã¦å¤§é›‘把ã«è¡¨ã«ã™ã‚‹ã¨æ¬¡ã®ã‚ˆã†ãªæ„Ÿã˜ã€‚ 言語 関数 Haskell, OCaml, Scheme, Erlang foldl* f init items C++ accumulate(begin, end, init, f) Ruby*, JavaScript items.inject(init, f) Python, Perl* reduce(f, items [, init]) 言語 畳ã¿è¾¼ã‚€äºŒé …演算 Scheme(SRFI)*, Erlang f(item, acc)
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