The basic structure of your code is efficient as it only loops throught the AoH once (you sort of described it as twice, but in fact once). To loop through twice is not a good idea for performance, if things can be done within one loop. Just to make that loop a little bit simpler.

use Data::Dumper;

my $AoH = [ { name   => "Bob",
              gender => "M" },
            { name   => "Sue",
              gender => "F" },
            { name   => "Mike",
              gender => "M" } ]; 
my ($men, $women);
map {(push @{($_->{"gender"} eq "M") ? $men : $women}, $_)} @$AoH;
print Dumper($men);
print Dumper($women);

[download]

Side note: even with your code, there was no need for you to remember the last index of the arrays. You can always push, or use $#array, so $m and $w can be removed.

In reply to Re: Assigning AoH pairs by value other AoH's by pg
in thread Assigning AoH pairs by value other AoH's by bradcathey

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.