How about using the hash for the banned keys? Something along these UNTESTED lines:
sub subtract {
   my ($whole_ref, $banned_ref) = @_;
   my %is_banned = map { $_ => 1 } @$banned_ref;
   return grep { ! $is_banned{$_} } @$whole_ref;
}

my @surviving = subtract([qw(fetch forward user smtp)], [qw(user smtp)
+]);

[download]
This will also preserve the ordering in the original "whole" array. Note that array references are passed to the subtract() sub, in order to be able to pass two arrays (the first with the "whole" list and the other with the "banned" one).

Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Don't fool yourself.

In reply to Re: Difference Quantity of two Arrays by polettix
in thread Difference Quantity of two Arrays by ocs

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