Re: Arrays and Hashes Mapping

[pingo]

If I understand you correctly, perhaps something like this:

@list = ('one' , 'two' , 'three');
%hash = ( one => 1 , two => 2 , three => 3 );

@list = grep { !$hash{$_} } @list;

[kappa]

Better use exists here, so that ( zero => 0, empty => '' ) won't give you false positives:

@list = grep { !exists $hash{$_} } @list;