On Oct 28, Richard Heintze said:
>I have an array stored in an object and I trying to
>compute the length of the array. This seemed to work
>initially:
The LENGTH of an array is @array or @{ $ref_to_array }. The LAST INDEX of
an array is $#array or $#{ $ref_to_array }.
>my $nColumns = [EMAIL PROTECTED]>{component_titles}}}+1;
You want my $nColumns = $#{ $me->{component_titles} }+1, or even better,
just my $nColumns = @{ $me->{component_titles} }.
>I don't really do anything to create to create this
>array -- I just start storing elements like this:
>
> $me->{component_titles}[0] = "xyz";
>
>Is there a better way to populate this array? Perhaps
>with a declaration or something?
That's ok. You can start by saying
$me->{component_titles} = [];
but that's not necessary. If you treat an undefined value as an array
reference, it becomes an array reference. This process is called
autovivification (automatically coming to life).
>my $a = [];
>$me->{a} = \$a;
>$a->[0] = 1;
>$a->[1] = 23;
>
>print $me->{a}->[0];
This is because $a is a reference to an array ALREADY. Storing \$a in
$me->{a} makes $me->{a} a reference to a reference to an array. Just
store $a, not \$a.
--
Jeff "japhy" Pinyan [EMAIL PROTECTED] http://www.pobox.com/~japhy/
RPI Acacia brother #734 http://www.perlmonks.org/ http://www.cpan.org/
<stu> what does y/// stand for? <tenderpuss> why, yansliterate of course.
[ I'm looking for programming work. If you like my work, let me know. ]
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