If your data is indeed stored in a hash you could do something like: 

#!/usr/bin/perl -w
use strict;

my (%sortme, $k);

%sortme = (
        1 => undef,
        2 => 4,
        3 => 5,
        4 => 3,
        5 => 1,
        6 => 3
);

foreach $k ( sort {
                return -1 if !defined $sortme{$a};
                return 1 if !defined $sortme{$b};
                $sortme{$a} <=> $sortme{$b};
            } keys %sortme ) {
        print "$k -> $sortme{$k}\n";
}

[download]
substituding the print statement with whatever is needed for your larger application. Note that my example works if two keys have the same dependency. And you'll get a warning about uninitialzed value when it tries to print $sortme{1};

Be Appropriate && Follow Your Curiosity

In reply to Re: Sorting by association, a tail of dependency resolving gone nowhere by mikeraz
in thread Sorting by association, a tail of dependency resolving gone nowhere by jcpunk

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.