How about a map? 
my @id_array = map { $_->{'ID'} } @array;

[download]
If you need to do a selective comparison, a grep after this operation works well: 
my @sel_id_array = grep { $_ < 30 } map { $_->{'ID'} } @array;

[download]
(Also, a PM hint: use <CODE> tags instead of PRE so that you can copy and paste code directly without any markup.)

Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain

In reply to Re: referencing hell by Masem
in thread referencing hell by purge

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