From: Robert Klemme <shortcutter@...>
Date: 2008-06-15T22:14:12+09:00
Subject: Re: How !isset in Ruby

On 15.06.2008 14:37, Martin Boese wrote:
> you can use defined?, however it will also hit on constants (classes), methods 
> and probably more ..:

For global variables testing for nil is probably better because they are 
always and implicitly defined:

robert@fussel ~
$ ruby -e 'p $foo'
nil

robert@fussel ~
$ ruby -e 'p foo'
-e:1: undefined local variable or method `foo' for main:Object (NameError)

robert@fussel ~
$ ruby -e 'p @foo'
nil

Cheers

	robert