From: "Mauricio Fernández" <batsman.geo@...>
Date: 2002-12-02T05:05:41+09:00
Subject: Re: class << self  (was Re: [FAQ] What do some of Ruby's symbols mean?)

On Mon, Dec 02, 2002 at 02:19:46AM +0900, ts wrote:
> >>>>> "H" == Hal E Fulton <hal9000@hypermetrics.com> writes:
> 
> H> But then, I find that "def self.meth" seems to
> H> work fine...
> 
>  it work fine, but sometimes it exist a difference
> 
> pigeon% cat b.rb
> #!/usr/bin/ruby
> class A
>    B = 12
>    def self.a
>       puts "class method A::a : #{B}"
>    end
> 
>    class << self
>       B = 24
>       def b
>          puts "class method A::b : #{B}"
>       end
>    end
> end
> 
> A::a
> A::b
> pigeon% 
> 
> pigeon% b.rb
> class method A::a : 12
> class method A::b : 24
> pigeon% 

I knew there was a difference, but I really expected something "bigger".
When I saw it, I thought "it introduces another scope, so what?". Is
there something obvious I'm not seeing there? Or is the new scope all
there's to see?

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