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Posted By

chrisaiv on 06/20/08


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ruby Singleton


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Mixing in a Module immediately after an objects Singleton class

 / Published in: Ruby
 

There are two ways to insert a module above the objects singleton class but before the objects Class

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  1. #You can open the class definition body of a singleton class and add instance methods, class methods, and constants
  2. #You do this by using the 'class' keyword and a CONSTANT
  3. class C
  4.   def hello
  5.     puts "this is a hello yo."
  6.   end
  7. end
  8.  
  9. module M
  10.   def talk
  11.     puts "hello."
  12.   end
  13. end
  14.  
  15. #Example 1
  16. example1 = C.new
  17. class << example1
  18.   include M
  19. end
  20. #Call the Singleton method
  21. example1.hello
  22. #Call the Module Mix-in
  23. example1.talk
  24.  
  25. #Example 2
  26. example2 = C.new
  27. example2.extend(M)
  28. example2.talk

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