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Singleton classes

/ Published in: Ruby
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  1. # How to define and use a singleton class
  2. # - modifies the class's class
  3. # - instance methods in the singleton class are class methods externally
  4.  
  5. class TheClass
  6.   class << self
  7.     def hello
  8.       puts "hi"
  9.     end
  10.   end
  11. end
  12.  
  13. # invoke a class method
  14. TheClass.hello            # hi

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