Here is how I failed: 
@id = sort { $lid->{split(/=/, $a)} cmp $lid->{split(/=/, $b)} } @id;

[download]

Near to success:

@id = sort { $lid->{(split(/=/, $a))[0]} cmp $lid->{(split(/=/, $b))[0
+]} } @id;

[download]

This line has to evaluate $a and $b each time sort does a comparison, which isn't efficient. I guess that ikegami's line neither is.

Should be used a temporary translation hash? Something like:

my %temp = map { $_ => (split(/=/, $_, 2))[0] } @id;
@id = sort { $lid->{$temp{$a}} cmp $lid->{$temp{$b}} } @id;

[download]

In reply to Re^5: How do I sort an array by hash value? by vitoco
in thread How do I sort an array by hash value? by josh097

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.