From: Dave Burt <dave@...>
Date: 2005-05-29T11:25:21+09:00
Subject: Re: Difference between 'def self..' and module_function .

Nikolai wrote:
> I'd prefer to not be sic'd, thanks.  In email quotations it's obvious
> that I made the error, not you.  But as long as we're at it, "sic" is
> written "sic".  It's not an abbreviation, so there's no dot.  "Sic" is a
> latin word meaning "thus".

Sorry for siccing you, I don't know what I was thinking. Thank you for the 
correction and etymology.

>> The second difference is that the latter case leaves a private instance
>> method behind.
>
> OK, thanks.  I guess I don't really see the application of this, but I
> guess I will once I'll actually need to :-),
>        nikolai

I think the main purpose is simply style.

There is another way to do this, as well, good for when you have many 
functions:

module A
  class << self
    def a
    end
  end
end

I never prefer module_function.

Cheers,
Dave