First I'd like to say that this is pretty clever: 
foreach my $e (@array1, @array2) {
    $union{$e}++ && $intersect{$e}++
}

[download]
To solve your problem, just use an array of references to your set arrays: 
my @sets = (\@array1, \@array2, ...);
for my $i (0..$#sets) {
  for my $j ($i+1..$#sets) {
    compute_stuff($sets[$i], $sets[$j]);
  }
}

[download]
Your union/intersection code will now look like: 
sub union_intersection {
  my ($set1, $set2) = @_;
  my (%union, %intersection)
  for my $e (@$set1, @$set2) { ... }
  ...
}

[download]

In reply to Re: Array name with a Variable by pc88mxer
in thread Array name with a Variable by godevars

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