From: Zhenning Guan <g.zhen.ning@...>
Date: 2008-10-21T16:23:20+09:00
Subject: what's different between self.method and class << self?

we can define a instance method in lots way.
mostly, I saw people define like this:
1.
class A
  def self.class_method
  #some code here....
  end
end

2.
class A
  class << self
    def class_method
    #some code here....
    end
  end
end


==
the question confused me is what's the advantage of doing this in 2?
they'are different? which is your choose?
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