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merging a hash with array of hashes

cucugirl
cucugirl asked
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Last Modified: 2012-05-06
Can somebody help me append the keys in a hash that are not in an array of hashes? just the keys that are not in that AoH, the rest should remain as it was originally in the AoH. Thanks!

my %Line = ('LIST'=>'2','PAGES'=>'77','EDITION'=>'new');
my @AoH = ({'LIST'=>'2','PAGES'=>'100'},
                      {'LIST'=>'10','EDITION'=>'new'},
                      {'PAGES'=>'30','EDITION'=>'old'},
                      {'LIST'=>'2','PAGES'=>'300'});

desired outcome:

my %Line = ('LIST'=>'2','PAGES'=>'77','EDITION'=>'new');
 my @AoH = ({'LIST'=>'2','PAGES'=>'100','EDITION'=>'new'},
{'LIST'=>'10','PAGES'=>'77','EDITION'=>'new'},
{'LIST'=>'2','PAGES'=>'30','EDITION'=>'old'},
{'LIST'=>'2','PAGES'=>'300','EDITION'=>'old','EDITION'=>'new'});
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Commented:
#if there are many keys in @AoH, and all the values are true, it may be more efficient to do
for my $h ( @Aoh ){ $h->{$_} ||= $Line{$_} for keys %Line }
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