From: Patrick Doyle <wpdster@...>
Date: 2008-10-21T21:20:16+09:00
Subject: Re: what's different between self.method and class << self?

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On Tue, Oct 21, 2008 at 3:23 AM, Zhenning Guan <g.zhen.ning@gmail.com>wrote:

> 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?
>
I asked this same question just a couple of weeks ago.  The answers I was
given were:

Method 2:
1) Saves some typing
2) Has a slightly different mechanism for looking up class constants, which
99.99% of the time won't be noticed.

Other than that there are no differences between methods 1 & 2.

--wpd

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