[EMAIL PROTECTED] wrote:
> Hi,
>
> What's the preferred waying of doing things...
>
> if ($var eq '')
>
> or
>
> if (defined $var)
>
> I assume they both mean pretty much the same thing?
>
No, defined is used to tell if the value is undef or not.
undef is a special scalar value, it is treated as '' when used
as a string and 0 when used as a number. If warnings are
turned on you will get a warning when it used in the RHS
of an expression.
perldoc perlsyn (read the section on 'Declarations')
e.g.
$var;
print "Is undef" if (!defined($var)); #prints Is Undef
$var = '';
print "value exists" if (defined($var)); #prints value exists
$var eq '' should be used for checking empty strings.
>
> Tristan
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