From: Sebastian Hungerecker <sepp2k@...>
Date: 2008-09-01T23:45:18+09:00
Subject: Re: Checking for 'nil' Class (not instance) variables?

John Pritchard-williams wrote:
> See below, what's the proper way of checking for initialized
> class-variables ?
> [...]
> irb(main):031:0> @nosuchvar.nil?
> => true

That doesn't check whether @nosuchvar was initialized. Look:
>> defined?(@var)
=> nil
>> @var.nil?
=> true
>> @var = nil # @var is now initialized
=> nil
>> @var.nil?
=> true
>> defined?(@var)
=> "instance-variable"

HTH,
Sebastian
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