That's Interesting. Does using grep show any significant improvement over just swapping the order of the foreach loops in your first filter?

I wonder if using each will have any impact? I'll have to give it a go and see.

So maybe something like this?

 while (my ($field,$value) = each %{$where}) {
      @in = grep { $_->{$field} eq $value } @in;
 }

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In reply to Re: On optimizing nested loops by RichardK
in thread On optimizing nested loops by FloydATC

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