What's the best way to implement uniq for arrays?

What I've got is this: 


#!/usr/bin/perl -w
@a=qw(ala ma kota tytus ma kolty a pies ma ale);
use Data::Dumper;

print Dumper(@a);
print "Sorted:\n";
print Dumper(sort @a);

print "Uniq:\n";
print Dumper(uniq(@a));
print "Uniq2:\n";
print Dumper(uniq(sort @a));


sub uniq {
        my @out=();
        my ($a,$lasta);
        foreach $a (@_) {
                push @out,$a unless (defined($lasta) && ($lasta eq $a)
+);
                $lasta=$a;
        };
        return @out;
};

[download]
This works, but it seems a bit ugly, looks like it's copying stuff too much ( I would prefer to work on original array ) etc...

20050317 Edit by castaway: Changed title from 'uniq'

In reply to Finding unique elements in an array by Eyck

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.