use of undef

Tom Phoenix rootbeer at
Wed Jun 13 10:27:13 CDT 2001

On Wed, 13 Jun 2001, Erik Hollensbe wrote:

> austin already replied about defined(), but you may find that something
> along these lines would solve your problem much cleaner than a GOTO:

GOTO? Who is using GOTO?

> @array(0..2, ,undef);

I think you omitted an equals sign here.

> $count = 0; # not needed unless use strict

No, if you have 'use strict' enabled, you would need to declare these
variables; that line wouldn't accomplish that. If you have warnings
enabled, you would need to initialize $count before using it as an array
index, though; that's probably what you were thinking of.

> while(1) { defined($array[$count]) ? $count++ : last };

Real Perl programmers don't use subscripts. :-) It's almost certainly more
efficient to use a foreach loop on the array. Also, I prefer not to use
the ?: operator as a control structure, since it is harder to understand
(and potentially less efficient) than a simple if/else would be.

Hope this helps!

Tom Phoenix       Perl Training and Hacking       Esperanto
Randal Schwartz Case:

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