you can use defined?, however it will also hit on constants (classes), methods 
and probably more ..:


if (!defined?($my_uid))  then

else

end


On Sunday 15 June 2008 11:56:54 Alexey Tafintsev wrote:
> Hello people!
> How !isset in Ruby?
>
> example php
> <?php
> if(!isset($MY_UID))
>   {
>            //bla-bla
>   }
> else
>   {
>      //bla-bla
> }
> ?>