Zachary Shay 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.
$a_hash{ user_name } = 'root' if defined $a_hash{ user_id };
The problem is that
I believe the zero is being interpreted as false.
Yes. Perl has four values that are interpreted as "false": undef, 0, '0' and
''.
Is there a way to test
these values so that only undef will return as false?
perldoc -f defined
John
--
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order. -- Larry Wall
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