I think Skeeve is correct. Your best way forward is a hash of the ids. 

my %set_contains = map { $_ => 1 } @id_set;
if ( $set_contains{$some_id} ) {
    # $some_id is in the set
}
# removes $some_id from the set:
delete $set_contains{$some_id};

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In reply to Re^3: Testing if an array contains a value and then deleting it in most efficient way by kyle
in thread Testing if an array contains a value and then deleting it in most efficient way by karpatov

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