On 9/24/07, Zachary Shay <[EMAIL PROTECTED]> wrote:
> Is there a way to test for values where zero is valid?
>
> For instance:
>
> %a_Hash;
> $a_hash{"user_id"} = 0;
> $a_hash{"user_name"} = "root" if ($a_hash{"user_id"});
>
> print $a_hash{"user_id"} if ($a_hash{"user_id"});
> print $a_hash{"user_name"} if ($a_hash{"user_name"});
>
> Sometimes the user_id can be undef. As a result, if there is no user_id...I
> don't concern myself with trying to assign a user_name. The problem is that
> I believe the zero is being interpreted as false. Is there a way to test
> these values so that only undef will return as false?
snip
I believe you are looking for the defined function.
perldoc -f defined
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