netswitch! | ãŸã¶ã‚“Rubyã§ã¯ 〜 Maybeモナドã«æ†§ã‚Œã¦ 〜Posted by nanki Wed, 28 Oct 2009 05:25:00 GMT Haskellã«ã¯Maybeモナドã¨ã„ã†ã®ãŒã‚ã£ã¦ã€ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’ã‹ãªã‚Šé©å½“ãªæ„Ÿã˜ã«æ›¸ã‘ã¦ã¨ã¦ã‚‚便利ãã†ã€‚ 一方ã€å¤šãã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã§ã¯ã€ request.mobile && request.mobile.docomo? File.open('example.txt').read rescue nil # ã“ã‚Œã¯ã™ã“ã—æ¨ªç€ class Never instance_methods.each do |v| undef_method(v) unless %w(__id__ __send__).include?(v) end def method_missing(*args) self end def end nil end end class Maybe < Never def initialize
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