Ruby Blocks as Dynamic Callbacks
Callbacks are a great technique for achieving simplicity and flexibility. Simply put, a callback is a block of code passed as an argument to a method. In Ruby, code blocks are everywhere and Ruby makes it trivial to pass a block of code to methods. For example: def foo(bar, &block) callback = block callback.call(bar) end foo(5) {|x| x * x} # => 25 But what do we do when a method needs two blocks o
Ruby Metaprogramming techniques
Ruby, Java, Lisp, Io, JRuby. Programming language archeology, creation and discovery. Updated: Scott Labounty wondered how the trace example could work and since a typical metaprogramming technique is writing before- and after-methods, I have added a small version of this. Updated: Fixed two typos, found by Stephen Viles I have been thinking much about Metaprogramming lately. I have come to the co
An Exercise in Metaprogramming with Ruby 日本語訳
authored by Hal Fulton February 18, 2006 translated to Japanese by Yoichiro Hasebe April 26, 2006 Ruby ã¯å‹•çš„ãªè¨€èªžã§ã‚る。ãれを知ã£ã¦ãŠã‚Šã€ã¾ãŸé«˜ã評価ã—ã¦ã„る者ã«ã¨ã£ã¦ã“ã‚Œã¯ç¹°ã‚Šè¿”ã—ã¦è¿°ã¹ã‚‹ã¾ã§ã‚‚ãªã„ã“ã¨ã 。ãŠãらããã®ã‚ˆã†ãªäººã€…ã¯å‹•çš„ãªè¨€èªžãŒé™çš„ãªè¨€èªžã‚ˆã‚Šä½•ã‚‰ã‹ã®æ„味ã«ãŠã„ã¦å„ªã‚Œã¦ã„ã‚‹ã¨ä¿¡ã˜ã¦ã„る。 実際ã®ã¨ã“ã‚ãã‚Œã¯ä½•ã‚’æ„味ã—ã¦ã„ã‚‹ã®ã ã‚ã†ã‹ï¼Ÿ ã©ã†ã„ã†ç†ç”±ã§ã€é–‹ç™ºæ™‚ã§ãªã実行時ã«äº‹ã‚’ãªã•ãã°ãªã‚‰ãªã„ã®ã‹ï¼Ÿ ã„ã‚„ãã‚‚ãã‚‚ãã‚“ãªã“ã¨ã‚’æ°—ã«ã™ã‚‹å¿…è¦ãŒã©ã“ã«ã‚ã‚‹ã®ã‹ï¼Ÿ 1990å¹´ã«åˆã‚ã¦å‹•çš„言語ã¨ã„ã†æ¦‚念ã«å‡ºä¼šã£ãŸã¨ãã€ç§ã«ã‚‚ピンã¨ã“ãªã‹ã£ãŸã€‚ã‚ã‚‹å‹äººãŒ Smalltalk ã¨ã„ã†è¨€èªžã«ã¤ã„ã¦èˆˆå¥®ã—ãŸå£ã¶ã‚Šã§ã€ã€Œã‚¯ãƒ©ã‚¹ã‚„メソッドを実行時ã«è¿½åŠ ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ã®ã‚ˆã€ãªã©ã¨æ•™ãˆã¦ãã‚Œ
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Ruby: Defining Class Methods
http://yohasebe.com/pages/trans-idiomatic-dynamic-ruby/
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