japhy
Enthusiast
Mar 24, 2000, 7:14 AM
Post #2 of 2
(536 views)
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I think you're thinking in a C kind of loop. In Perl, you don't need to iterate over an array by element number, you can iterate over the actual elements:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
# what a C programmer might do...
for ($i = 0; $i = $#array; $i++) {
playwith($array[$i]);
}
# what a Perl programmer would do...
for (@array) {
playwith($_);
}
</pre><HR></BLOCKQUOTE>
Read about for (or foreach) loops in the perlsyn documentation (comes with Perl, and is also on this web site). To work with two dimensional arrays, do something like:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
for $out (@array) {
for $in (@{ $out }) {
playwith($in);
}
}
</pre><HR></BLOCKQUOTE>
To get the number of elements in an array, evaluate @array in scalar context:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
$size = @foo;
</pre><HR></BLOCKQUOTE>
To get the LAST INDEX of an array (which is the number of elements, minus one), use the $#array variable:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
$lastindex = $#bar;
</pre><HR></BLOCKQUOTE>
Arrays are discussed in the perldata documentation. Multidimensional arrays are discussed in perlref, perllol, and perldsc. The perlreftut documentation (which comes with either 5.005_03 or the newest Perl, 5.6) might be good for you, too. If that's not on this site, perhaps it can be gotten from the http://www.perl.com/ web site.
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