Chas Owens wrote:
On 8/14/07, DJ Gruby <[EMAIL PROTECTED]> wrote:
Hello there!
Have question if that is possible to empty a few arrays with one simple command?
For the moment I clear these six tables by assigning them an empty list:
@bitmap_addr_lo = ();
@bitmap_addr_hi = ();
@screen_addr_lo = ();
@screen_addr_hi = ();
@colors_addr_lo = ();
@colors_addr_hi = ();
Just wondering if there is a more elegant way to achieve the same result?
Many thanks in advance for your help!
Regards,
DJ Gruby.
The desire to empty arrays is a bad sign. It generally means you do
not have them declared with the correct scope, but, assuming you have
a good reason, there are many ways to reset a bunch of arrays. Here
are two in addition to your straight forward way.
@bitmap_addr_lo = @bitmap_addr_hi = @screen_addr_lo = @screen_addr_hi
= @colors_addr_lo = @colors_addr_hi = ();
@$_ = () for \(@bitmap_addr_lo, @bitmap_addr_hi, @screen_addr_lo,
@screen_addr_hi, @colors_addr_lo, @colors_addr_hi);
Frankly, I think the straight forward way is more readable since I
dislike lines longer than 78 characters. But, given the names of the
arrays and the fact that they are all being reset at the same time I
think you are using the wrong data structure. You should be using an
HoHoA (a hash of hashes of arrays): $addr{screen}{hi} instead of
@screen_addr_hi.
Then you could clear them all by saying
for my $type (qw<screen bitmap colors>) {
for my $loc (qw<hi low>) {
$addr{$type}{$loc} = [];
}
}
or (my favorite)
@{$_}{qw<hi low>} = ([], []) for @addr{qw<screen bitmap colors>};
or the more comprehensive (but dangerous if other keys are being used)
for my $type (keys %addr) {
@$_ for keys %$type;
}
Or simply:
%addr = ();
--
Just my 0.00000002 million dollars worth,
Shawn
"For the things we have to learn before we can do them, we learn by doing them."
Aristotle
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
http://learn.perl.org/
