From: Trans <transfire@...>
Date: 2008-03-15T04:49:15+09:00
Subject: Re: need for singleton_methods



On Mar 14, 3:26 pm, Chinna Karuppan <chinnakarup...@gmail.com> wrote:
> I have trying to learn about this class<<self;self;end and the
> class<<self followed by defining the method.I absolutely don't see
> anything which will help this case.I can very well do it directly on the
> class ...
> class Foo
>  def Foo.bar
>  end
> end
>
> what is the advantage I get by using the class << self notation...
>
> class Foo
>  class<<self
>   def bar
>   end
> end
> end

If you want to use a helper method, like #attr_accessor, for instance,
this form becomes more convenient:

  class Foo
    class<<self
      attr_accessor :bar
    end
  end

> This is all confusing .Can any body suggest a simple example with
> tangible result to show the advantage.I am pretty sure more
> people(nubies) will have this....
>
> I have been doing my home work for the pass 2 days. I found that it is
> helpful in inheritance as per the whytheluckystiff.com guy (why's
> poignant guide)....I don't understand what is the need for even in that
> case.If I define the method directly like this
>
> class Foo
>  def Foo.bar
>  end
> end

Better:

  class Foo
    def self.bar
    end
  end

If you ever change then name of the module, you won't have to change
it all over the place.

T.