I'm not sure why rtoa has to be in the closure.
Just realised it doesn't thanks to the introduction of state variables in perl v5.10.
use v5.10;
use strict;
use warnings;
use List::Util qw(reduce);
sub roman_to_dec {
state %rtoa = ( M=>1000, D=>500, C=>100, L=>50, X=>10, V=>5, I=>1 );
reduce { $a+$b-$a%$b*2 } map { $rtoa{$_} } split//, uc(shift);
}
my @testdata = ( "XLII", "LXIX", "mi" );
for my $r (@testdata) {
print "$r: ", roman_to_dec($r), "\n";
}
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