02.pl

#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dumper;

$, = ", ";

sub GetSymmetricDifference {
    my (@firstArr, @secondArr) = @_;
    my %uniqueHash = ();

    push @firstArr, @secondArr;
    @uniqueHash{@firstArr} = ();
    return keys % uniqueHash;
}