モナドã«ã¤ã„ã¦è€ƒãˆãŸè¨˜éŒ² - ç´ äººãŒãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’勉強ã—ã¦ã„ãŸãƒ–ãƒã‚°Promiseã£ã¦ãªã‚“ã¨ãªãモナドã£ã½ã„ãªã¨æ€ã£ã¦ã€ã‚¸ã‚§ãƒãƒ¬ãƒ¼ã‚¿ä½¿ã£ã¦Haskellã®doã‚’å†ç¾ã§ããªã„ã‹ãªã‚ã¨ã„ã†ã®ãŒã¯ã˜ã¾ã‚Šã€‚çµè«–ã‹ã‚‰ã„ã†ã¨ã€ã§ããªã„。 ãã‚‚ãã‚‚PromiseãŒãƒ¢ãƒŠãƒ‰ã§ã‚ã‚‹ã‹ã‚’考ãˆã‚‹ã€‚ return :: Monad m => a -> m a 値をå—ã‘å–ã£ã¦fulfilledã•ã‚ŒãŸPromiseã‚’è¿”ã™ã‚‚ã®ã Promise.fulfill / Promise.resolveãŒã“ã‚Œã«ã‚ãŸã‚‹ã€‚ Promise.mreturn = Promise.fulfill || Promise.resolve; >>= :: Monad m => m a -> (a -> m b) -> m b bindã¨ã‚‚呼ã°ã‚ŒãŸã‚Šã™ã‚‹ã€‚ã“ã®é–¢æ•°ã«ã€å€¤ã‚’å—ã‘å–ã£ã¦ãƒ¢ãƒŠãƒ‰ã‚’è¿”ã™é–¢æ•°ã‚’渡ã™ã¨ã€ãã®å€¤ãŒçµæžœã«ãªã‚‹ã€‚ Promise.prototype.mbind = Promise.prototype
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