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innig.net/software/ruby/closures-in-ruby.rb

http://ola-bini.blogspot.com/2006/09/ruby-metaprogramming-techniques.html

MetaProg Techniques

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 conclusion that I would like to see more examples and explanations of these techniques.
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