From: Tor Erik Linnerud <tel@...>
Date: 2008-06-15T21:32:48+09:00
Subject: Re: How !isset in Ruby


> How !isset in Ruby?

Judging by http://uk2.php.net/isset, !(var.nil? rescue true) will 
achieve something similar to !isset().

var.nil? rescue true
=> true

var = 123
var.nil? rescue true
=> false

var = nil
var.nil? rescue true
=> true

But I am not sure that it makes any sense when used with the Ruby CGI 
library. An exception will be raised if a variable which doesn't exist 
is accessed. All variables are generally evaluated to true, except for 
those set to false or nil. If you want more help you have to tell us 
what your problem is more exactly.

Tor Erik
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