From: Jonan Scheffler <jonanscheffler@...>
Date: 2012-05-27T21:39:49+09:00
Subject: Re: Am I justified to use a global variable if it must be used in all scopes?

--0016e6d644e892d24604c103e595
Content-Type: text/plain; charset=ISO-8859-1

Perhaps a singleton class? It seems to me that you're probably in need of
some more abstraction if you feel you need a global variable.
On May 27, 2012 8:34 AM, "Phil Stone" <lists@ruby-forum.com> wrote:

> Hello,
> Ever since I started learning Ruby, I've been strongly discouraged
> from using global variables
> (http://www.caliban.org/ruby/rubyguide.shtml#style)
> (http://www.ruby-forum.com/topic/187685#819233).
>
> In a program I'm making, I have a variable (which stores an instance of
> a class) that is declared outside of any functions or classes. However,
> I need to be able to call its methods from various class and function
> scopes, and nothing but a global variable would let me do that. This
> variable is simply what the program is centered around, and must be
> accessed and edited by various classes. I'm not sure why a global
> variable would be such a bad habit in this case, especially since it is
> only one.
>
> Can I justify using it?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

--0016e6d644e892d24604c103e595
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<p>Perhaps a singleton class? It seems to me that you&#39;re probably in ne=
ed of some more abstraction if you feel you need a global variable.</p>
<div class=3D"gmail_quote">On May 27, 2012 8:34 AM, &quot;Phil Stone&quot; =
&lt;<a href=3D"mailto:lists@ruby-forum.com">lists@ruby-forum.com</a>&gt; wr=
ote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello,<br>
Ever since I started learning Ruby, I&#39;ve been strongly discouraged<br>
from using global variables<br>
(<a href=3D"http://www.caliban.org/ruby/rubyguide.shtml#style" target=3D"_b=
lank">http://www.caliban.org/ruby/rubyguide.shtml#style</a>)<br>
(<a href=3D"http://www.ruby-forum.com/topic/187685#819233" target=3D"_blank=
">http://www.ruby-forum.com/topic/187685#819233</a>).<br>
<br>
In a program I&#39;m making, I have a variable (which stores an instance of=
<br>
a class) that is declared outside of any functions or classes. However,<br>
I need to be able to call its methods from various class and function<br>
scopes, and nothing but a global variable would let me do that. This<br>
variable is simply what the program is centered around, and must be<br>
accessed and edited by various classes. I&#39;m not sure why a global<br>
variable would be such a bad habit in this case, especially since it is<br>
only one.<br>
<br>
Can I justify using it?<br>
<br>
--<br>
Posted via <a href=3D"http://www.ruby-forum.com/" target=3D"_blank">http://=
www.ruby-forum.com/</a>.<br>
<br>
</blockquote></div>

--0016e6d644e892d24604c103e595--