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Two ways of extending a class by class methods

/ Published in: Ruby
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An example which illustrates the ways of extending a class by class methods.

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  1. # encoding: utf-8
  2.  
  3. # Two ways of extending a class by class methods.
  4. module M
  5.   module ClassMethods
  6.     def one
  7.       'ok!'
  8.     end
  9.  
  10.     def two
  11.       'ok two!'
  12.     end
  13.   end
  14. end
  15.  
  16. # I
  17. class TestOne
  18.   class << self
  19.     include M::ClassMethods
  20.   end
  21. end
  22.  
  23. # II
  24. class TestTwo
  25.   extend M::ClassMethods
  26. end
  27.  
  28. puts [
  29.   TestOne.one, #=> ok!
  30.   TestOne.two  #=> ok two!
  31. ]
  32.  
  33. puts [
  34.   TestTwo.one, #=> ok!
  35.   TestTwo.two  #=> ok two!
  36. ]

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