I too couldn't resist. A single walk through the hash's keys is the fastest way I could think of doing this:

sub dkubb_compare {
  my $data  = shift;
  my $first = @{$data{scalar each %$data}};

  while(my $key = scalar each %$data) {
    return 0 unless $first == @{$data{$key}};
  }

  return 1;
}

[download]

IMHO, it's a little too obscure to be used in production code, but I think it still is a neat idiom.

In reply to (dkubb) Re: (5) Fastest way to compare multiple variables? by dkubb
in thread Fastest way to compare multiple variables? by Anonymous Monk

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