On Wed, 20 Apr 2005, Keith Worthington wrote:
> Having written the following code I am now troubled by v_feet_str or
> v_inch_str being undefined. If there is no match can I return a
> default value? In my case if there is no dimension then I want to
> move ahead using a zero in that position.
The usual idom for this is something like
$foo = defined $foo ? $foo : 0;
Or maybe
$foo ||= 0;
Or maybe simply
$foo += 0;
I think I like the last one best. It's short, clear, and should do the
right thing for you.
(Skipping ahead a bit, Perl6 , if I remember right, is going to have the
'//' operator that tries to solve this sort of problem, allowing you to
set a value for a variable if & only if it wasn't already defined. But
it'll be a little while before this is available, though you can start
playing around with things like this using the Perl6::* CPAN modules.)
--
Chris Devers
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