Functional Programming Patterns: A Cookbook
By Karthik Iyengar This article targets an audience that’s graduating from functional libraries like ramda to using Algebraic Data Types. We’re using the excellent [crocks](https://evilsoft.github.io/crocks/?source=post_page---------------------------) library for our ADTs and helpers, although these concepts may apply to other ones as well. We’ll be focusing on demonstrating practical application
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Pythonã§Maybeモナドを書ã„ã¦ã¿ã‚‹ - Qiita
ã¯ã˜ã‚ã« ã“ã¡ã‚‰ã¯ãƒ¢ãƒŠãƒ‰ãƒ»åœè«–ã‚’ç†è§£ã™ã‚‹ãŸã‚ã®å‹‰å¼·ãƒ¡ãƒ¢ã€‚ モナドやåœè«–をプãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®å´ã‹ã‚‰å‹‰å¼·ã—よã†ã¨ã™ã‚‹ã¨ã€Haskellã®ã‚³ãƒ¼ãƒ‰ãŒã‚ˆãã§ã¦ãる。 ã—ã‹ã—自分ã¯ï¼ˆã„ãšã‚Œè§¦ã‚ŠãŸã„ã‘ã©ï¼‰Haskellã«æ…£ã‚Œã¦ã„ãªã„ã®ã§ã‚ˆãã‚ã‹ã‚‰ãªã„。 ãªã®ã§ãã‚Œãªã‚Šã«æ…£ã‚Œã¦ã„ã¦ã‹ã¤å‹•ä½œç¢ºèªã—ã‚„ã™ã„Pythonã§å®Ÿè£…ã—ãªãŒã‚‰æ”»ã‚ã¦ã¿ã‚‹ã€‚ 計算çµæžœãŒä¸å®šã®å€¤ã‚’扱ã†ãŸã‚ã®æŠ½è±¡æ¦‚念 確定ã—ã¦ã„る値(a)㯠Just a ã¨è¡¨ã™ 値ãŒå˜åœ¨ã—ãªã„å ´åˆã¯ Nothing ã¨è¡¨ã™ 計算éŽç¨‹ã§ä¾‹å¤–ãŒç™ºç”Ÿã—ã†ã‚‹å‡¦ç†ã‚’ã€ä¾‹å¤–処ç†ã®è€ƒæ…®ãªã—ã«å®Ÿè£…ã—ãŸã„å ´åˆã«ä½¿ãˆã‚‹ å‚考 http://labs.timedia.co.jp/2011/05/monad-in-python.html https://qiita.com/south37/items/06cfa95aa9c8f2ecb2e9 実装 モナドクラス(ä»®) class Mon
Pythonã§Haskellã®Maybeモナド（もã©ã）を実装ã—ã¦ã¿ã‚‹ - ã‚‚ã‚‚ã„ã‚テクノãƒã‚¸ãƒ¼
Haskellを勉強ã—ã¦ãã¦ã€ã‚ˆã†ã‚„ãモナドã®é›°å›²æ°—ãŒã‚ã‹ã£ã¦ããŸã®ã§ã€Maybeモナドã®ã‚ˆã†ãªè¨ˆç®—ã‚’Pythonã§ã‚„ã£ã¦ã¿ã‚‹ã€‚ #!/usr/bin/env python # -*- coding: utf-8 -*- # instance Monad Maybe where # return = Just # fail = Nothing def Maybe(x): return Just(x) if x else Nothing() class Just: def __init__(self, x): self.value = x def __repr__(self): return "Just(%r)" % self.value # (Just x) >>= f = f x def bind(self, f): return f(self.value) # '>>=' ã®ä»£ã‚ã‚Šã«
Maybeモナド 㨠Listモナド - Qiita
ã™ã”ã„Haskell ãŸã®ã—ãå¦ã¼ã†ã€€13ç« ã€Œãƒ¢ãƒŠãƒ‰ãŒã„ã£ã±ã„ã€ã®éƒ¨åˆ†ã®èªæ›¸ä¼šç”¨ã«ä½œæˆã—ãŸè³‡æ–™ã‚’公開ã—ã¾ã™ã€‚演習å•é¡Œã‚„周辺ã®è©±é¡Œã«è»½ããã‚Œã¦ã„る部分ãŒã‚ã‚Šã¾ã™ã€‚é–“é•ã„ç‰ã‚ã‚Šã¾ã—ãŸã‚‰ã”指摘ã„ãŸã ã‘ã‚‹ã¨å¹¸ã„ã§ã™ã€‚ 13. モナドãŒã„ã£ã±ã„ Functorã‚„Applicativeã‚’å°Žå…¥ã—ãŸå‹•æ©Ÿã®ã²ã¨ã¤ã¨ã—ã¦ä»¥ä¸‹ã®ã‚ˆã†ãªã‚‚ã®ãŒã‚ã‚‹ã¨æ€ã„ã¾ã™ã€‚ Functor ã‚’å°Žå…¥ã—ãŸå‹•æ©Ÿ a -> b åž‹ã®é–¢æ•°ã‚’ f a -> f b ã®é–¢æ•°ã«ã—ãŸã„ (fmapæ“作ãŒæ¬²ã—ã„) Applicative ã‚’å°Žå…¥ã—ãŸå‹•æ©Ÿ f (a -> b) åž‹ã‚’ f a -> f b åž‹ã®é–¢æ•°ã«ã—ãŸã„ (<*>æ“作ãŒæ¬²ã—ã„) Functor/Applicativeã‚’å°Žå…¥ã—ãŸå‹•æ©Ÿã«ä»¥ä¸Šã®ã‚ˆã†ãªã‚‚ã®ãŒã‚ã£ãŸã®ã¨åŒã˜ãMonadã‚’å°Žå…¥ã™ã‚‹å‹•æ©Ÿã¨ã—ã¦æ¬¡ã®ã‚ˆã†ãªã‚‚ã®ãŒã‚ã‚Šã¾ã™ 「普通ã®å€¤ a ã‚’å–ã£ã¦æ–‡è„ˆä»˜ãã®å€¤ã‚’è¿”ã™é–¢æ•° (a -> m
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A Pythonic implementation of the Maybe monad
GitHub - dry-python/returns: Make your functions return something meaningful, typed, and safe!
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