From: dblack@...
Date: 2007-01-08T21:48:07+09:00
Subject: Re: OO way of local variable passing

Hi --

On Mon, 8 Jan 2007, Krekna Mektek wrote:

> Hi,
>
> What is the OO way to do this?
>
>
> I've got a front-end script:
>
> front.rb which calls site.rb
>
> in site.rb there is a method1 and method2.
>
> method1 creates a directory (the name is based on some other info) and
> this directoryname is needed in method2.
>
>
> in front.rb I do this:
>
> I create the site object and then call:
> site.method1  (new dir is created)
> site.method2 (do some things in this directory)
>
>
> So, the first method is like:
>
> def method1
>
> ...
> new_dir = [...magic code..]
> ...
> end
>
>
> def method2
> ...
> get_files = @basedir + new_dir
> ...
> end
>
> But, this new_dir variable is not known in method2.
>
> * Do I need to return this new_dir variable from method1, and call the
> other method with new_dir as argument like site.method2(new_dir) ?
>
> * Do I have to make from new_dir a class variable? (the way I have it now)
>
> * Is there another way to do this?

If I'm understanding the situation correctly it looks like you could
use an instance variable:

   def method1
     ...
     @new_dir = (whatever)
     ...
   end

   def method2
     ...
     get_files = @basedir + @new_dir
     ...
   end

That's the normal way of maintaining state for a particular object.


David

-- 
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