Yet another approach, not necessarily better: 

>perl -wMstrict -le
"use List::MoreUtils qw(part);
 use Data::Dump qw(pp);
 ;;
 my @source = (1, 2, 3, 4, 5, 7);
 my @target = (0, 1, 3, 4, 6);
 ;;
 my %diff;
 ++$diff{$_} for @source;
 --$diff{$_} for @target;
 ;;
 my ($ar_in_t_not_s, undef, $ar_in_s_not_t) =
   part { 1 + $diff{$_} } keys %diff;
 ;;
 print 'in t not s: ', pp $ar_in_t_not_s;
 print 'in s not t: ', pp $ar_in_s_not_t;
"
in t not s: [6, 0]
in s not t: [7, 2, 5]

[download]

In reply to Re: compare arrays, and list the difference by AnomalousMonk
in thread compare arrays, and list the difference by iza

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.