Thanks again chromatic. I do understand the basics you explained. I guess there is something idomatic that I'm missing. I was able to get it working fine by replacing the grep line with: 
my @difference;
for my $i ( 0 .. $#AoH_all) {
   for my $key (keys(%keep_ids)) {
      if ($AoH_all[$i]{'id'} == $key ) {
         $difference[$i] = $AoH_all[$i];
      }
   }
 }

[download]
I'm sure that your grep line is doing just that. I just can't get it to work. 
my %difference = grep { exists $keep_ids{ $_->{id} } } @AoH_all;
print Dumper (%difference);

[download]
prints: 
$VAR1 = 'HASH(0x808bd2c)';
$VAR2 = undef;

[download]
The deadline looms, so I must 'loop' back for another look at grepping and that last line of yours. Thanks for getting me this far!

Update: With those edits to chromatic's grep line, it worked as intended beautifully. PM rocks.

—Brad
"A little yeast leavens the whole dough."

In reply to Re: Re: Re: Re: Splice of ref to AoH not removing element by bradcathey
in thread Splice of ref to AoH not removing element by bradcathey

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