From: Phil Stone <lists@...>
Date: 2012-05-27T21:33:20+09:00
Subject: Am I justified to use a global variable if it must be used in all scopes?

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?

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