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Just in time convenience methods

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Using instance_eval to abstract values into meaningful methods

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  1. time_components = /(\d+):(\d+):(\d+)/.match("17:00:34")
  2. time_components.instance_eval do
  3.   def hours; self[1] end
  4.   def minutes; self[2] end
  5.   def seconds; self[3] end
  6. end
  7.  
  8. time_components.hours # => "17" 
  9. time_components.minutes # => "00" 
  10. time_components.seconds # => "34" 
  11. time_components.class # => MatchData

URL: http://toolmantim.com/article/2006/11/29/instance_eval_brings_sexy_back

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