You're right. I'm surprised too (not least because map could actually be implemented that way within perl...). I get a lot of variability (perl 5.8.8, x86_64-linux-gnu-thread-multi), but the for loop is a little faster.

All the comments about better style still stand, but I would certainly have expected the map to be faster. This is odd. Anyone have a 5.10 to hand to see if anything has changed?

Sidenote: 

# Populate list with 10 mio numbers
for (my $i=0; $i<1000_000; $i++) {
    push @results, $i;
}

[download]
is perhaps better written as: my @results = (0..1_000_000); (Of course, given your observation regarding map, whether it performs better is now a whole 'nother ball of wax.)

In reply to Re: map versus for by jbert
in thread map versus for by dHarry

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.