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Just remembered I did a Rosetta code node, implementing the same PGA-TRAM algorithm in Perl, Python, Haskell and C++. In Perl I chose simple lexical scoping to data-hide the rtoa hash:

{ my %rtoa = ( M=>1000, D=>500, C=>100, L=>50, X=>10, V=>5, I=>1 ); sub roman_to_dec { reduce { $a+$b-$a%$b*2 } map { $rtoa{$_} } split//, uc(shift) } }

Not wanting to get a headache from understanding Python scoping, I chose to data-hide the rtoa hash by making it a default function argument instead:

def roman_to_dec(r, __rtoa = dict(M=1000, D=500, C=100, L=50, X=10, V= +5, I=1) ): return reduce( lambda t,n: t+n-t%n*2, (__rtoa[c] for c in r.upper()) + )

Suggestions for alternative/better ways to implement this algorithm in Perl and Python are still welcome (11 years later! :).

In reply to Re^5: A short whishlist of Perl5 improvements leaping to Perl7 by eyepopslikeamosquito
in thread A short whishlist of Perl5 improvements leaping to Perl7 by rsFalse

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