Home > Archive > PERL Miscellaneous > July 2005 > Can you explain it?
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| Author |
Can you explain it?
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| Oliver Block 2005-07-26, 5:02 pm |
| Hi,
do you have any idea, why the following construct increases the number
of element of my array of arrays @myArray with one?
if ( @#{ $myArray[$myElements] } < 0) { ...
bye,
Oliver
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| xhoster@gmail.com 2005-07-26, 5:02 pm |
| "Oliver Block" <oliver.block@epost.de> wrote:
> Hi,
>
> do you have any idea, why the following construct increases the number
> of element of my array of arrays @myArray with one?
>
> if ( @#{ $myArray[$myElements] } < 0) { ...
I don't know that it does do that (I couldn't replicate it), but I wonder
why you messing with a slice of the semi-special hash '%#'?
Did you perhaps mean $# rather than @#?
Are you using warnings?
Xho
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| Tad McClellan 2005-07-26, 10:03 pm |
| Oliver Block <oliver.block@epost.de> wrote:
> Subject: Can you explain it?
Please put the subject of your article in the Subject of your article.
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
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| Anno Siegel 2005-07-27, 4:02 am |
| Oliver Block <oliver.block@epost.de> wrote in comp.lang.perl.misc:
> Hi,
>
> do you have any idea, why the following construct increases the number
> of element of my array of arrays @myArray with one?
>
> if ( @#{ $myArray[$myElements] } < 0) { ...
What a mess. Your subject tells us nothing about your question, your
code is messed up, and your question makes an unjustified assumption.
In truth, what you do doesn't increase the number of array elements by
one, it creates a new array element in position $myElements unless
there already is one. The reason for this happening is called
"autovivification". Read about it in perlref.
Anno
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