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I wrote a Perl 6 version (transcoded from the Perl 5 version), which uses the following improvements:
  • Instead of another scope for %rtoa, I used a state variable (also available in perl-5.10)
  • I wrote the "pipeline" as a set of method calls, which means they are read in the order that they are executed
  • Use of a formal parameter
  • say instead of print (also available in 5.10)
  • (Updated) use hyphens instead of underscores as word separator in the sub name. It's a matter of taste, but I like it better that way.

Here's the code, which works with today's Rakudo:

sub roman-to-dec($x) { state %rtoa = M=>1000, D=>500, C=>100, L=>50, X=>10, V=>5, I=>1; $x.uc.split('').map({ %rtoa{$_} }).reduce: { $^a+$^b-$a%$b*2 } } my @testdata = <XLII LXIX mi>; for @testdata -> $r { say "$r: ", roman-to-dec($r); }

In reply to Re: Rosetta PGA-TRAM by moritz
in thread Rosetta PGA-TRAM by eyepopslikeamosquito

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