Further down in that node (and in other search results) suggest using a hash. I really don't see how to do that in my case.
use strict;
use strict;
use warnings;
use Data::Dump qw(pp);
my %oldvalue = (
foo => "1",
bar => "2",
baz => "3"
);
my %newvalue = (
foo => "A"
);
foreach my $key (keys %oldvalue) {
if (exists $newvalue{$key}) {
$oldvalue{$key} = $newvalue{$key};
}
}
pp \%oldvalue; # { bar => 2, baz => 3, foo => "A" }
Or even simpler:
use strict;
use warnings;
use Data::Dump qw(pp);
my %oldvalue = (
foo => "1",
bar => "2",
baz => "3"
);
my %newvalue = (
foo => "A"
);
%oldvalue = (%oldvalue, %newvalue);
pp \%oldvalue; # { bar => 2, baz => 3, foo => "A" }
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