Here's a one-liner (if the original order isn't important) - no temp hash var required: 
@foo = (1, 1, 1, 2, 3, 3, 3, 4, 5, 5, 6, 7, 8, 8,  9, 10);
my @unique = sort {$a <=> $b} keys({map {$_ => 1} @foo});
print join(",", @unique) . "\n";

[download]
Two or more arrays? Not a problem. 
@foo = (1, 2, 3, 4, 5, 6, 7,  8,  9,  10);
@bar = (0, 1, 2, 5, 7, 9, 11, 12, 13, 14);
my @unique = sort {$a <=> $b} keys({map {$_ => 1} (@foo, @bar)});
print join(",", @unique) . "\n";

[download]
-Simon

In reply to Re^2: Extracting unique elements from array by SimonSaysCake
in thread Extracting unique elements from array by koolgirl

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.