over the equally efficient ...
i think a "foreach loop" is more efficient, but maybe i'm making a mistake in my benchmark? 
perl -wle'
use Benchmark;
my $max = $ARGV[0];
timethese($ARGV[1]||-1, {
  for     => sub { for (my $i=0;$i<$max;$i++) { 1 } },
  foreach => sub { for my $i (0..$max-1)      { 1 } },
}
)' 10000 2000

Benchmark: 
timing 2000 iterations of
 for, foreach
...

       for:  8 wallclock secs ( 7.63 usr +  0.00 sys =  7.63 CPU) @ 26
+2.12/s (n=2000)

   foreach:  5 wallclock secs ( 5.38 usr +  0.00 sys =  5.38 CPU) @ 37
+1.75/s (n=2000)

[download]

In reply to Re^3: Hash problem - Perl noob by tinita
in thread Hash problem - Perl noob by UncleTom

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.