I'm not aware of a convenient per-item combination. I hear that Perl 6 will have "hyper-operators" for that, when it reaches a stable release version >= 1.0.

I'd do that with a map, as I always use map when transforming one list into another:

@{$audit}{@$copy_fields} = map { defined $item->{$_} ? $item->{$_} : '
+' } @$copy_fields;

[download]

Your code will happily replace a value of "0" by "", and I guess that's not intended.

In reply to Re: ||= in Hash Slice by Corion
in thread ||= in Hash Slice by Brovnik

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