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JavaScriptã§é…延評価(?) - Hatena’s Kitchen
id:amachangã•ã‚“ãŒé…延評価ã¨ã‹ã§ã„ã‚ã„ã‚ã‚„ã£ã¦ã„ã‚‹ã®ã‚’見ã¦ï¼Œã¤ã„ã‹ã£ã¨ãªã£ã¦ã‚„ã£ã¦ã—ã¾ã£ãŸã€‚ å°‘ã—é•·ã„ã‘ã©ï¼Œã‚ˆã†ã™ã‚‹ã«ãƒ•ã‚£ãƒœãƒŠãƒƒãƒæ•°åˆ—ã‚’Haskell風㫠cons(0, cons(1, zipWith(add, fib, cdr(fib))))ã¨æ›¸ããŸã‹ã£ãŸã€‚ 以下ãŒå®Ÿè£…。 function Cons (car, cdr) { if (car == null || cdr == null) { throw "illegal object."; } this.car = car; this.cdr = cdr; } function Action (act) { if (act == null) { throw "illegal object."; } this.action = act; } function Thunk (any) { if (any instanceof T
Haskell ã®ãƒªã‚¹ãƒˆã¨é…延評価ãŒå°‘ã—分ã‹ã£ãŸ - IT戦記
ã„ã‚ã„ã‚試行錯誤をã—ã¦ã„㦠JavaScript ã®é–¢æ•°ã‚’作ã£ã¦å‘¼ã³å‡ºã™ã®ã¨ Haskell ã®ãã‚Œã¨ã®æ±ºå®šçš„ãªé•ã„を見ã¤ã‘ãŸã€‚ ãã‚Œã¯ã€ãŸã¶ã‚“ã‚‚ã®ã™ã£ã”ã„å˜ç´”ã§å½“ãŸã‚Šå‰ãªã“ã¨ã ã‘ã©ã€ã“ã‚ŒãŒåˆ†ã‹ã£ãŸã¨ãŸã‚“ã«åƒ•ã®å‘¨ã‚Šã®ãƒ”ースãŒä¸€æ°—ã«ç¹‹ãŒã£ãŸã®ã§ã€æ¥ã‚’ã—ã®ã‚“ã§æ›¸ã。 僕ã¯ä»¥ä¸‹ã®ã‚ˆã†ã«è„³å†…変æ›ã—ã¦ã„㦠Haskell a = 1 iszero i = if (i == 0) then True else False Javascript a = function() { return 1 } iszero = function(i) { return i()/*評価ã¯é–¢æ•°å‘¼å‡ºã—*/ == 0 ? True : False } // True False ã¯ã“ㆠTrue = function() { return true } False = function() { return false
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