From: Hadmut Danisch <x4@...>
Date: 2004-12-17T02:42:23+09:00
Subject: Testing global variables for existence?

Hi,

I need to set a global variable (e.g. $configfile ) to a default value
if it has not been set before to anything else. In order to
not overwrite it I have to check whether it has been set previously.

$configfile.nil?  would do the job, but  ruby -w  spits out a warning
that the variable has not yet been initialized.

How do I test whether the variable has been set without causing
ruby -w to print a warning in case it has not been set?

regards
Hadmut