#!/usr/bin/ruby

# Translation of: https://rosettacode.org/wiki/Roman_numerals/Encode#ActionScript

func roman2arabic (roman) {

    var romanArr = roman.uc.split('');

    static lookup = :(
        I =>    1,
        V =>    5,
        X =>   10,
        L =>   50,
        C =>  100,
        D =>  500,
        M => 1000,
    );

    var num = 0;
    while (romanArr.len > 0) {
        var val = lookup{romanArr.shift};
        num += val*(romanArr.exists(0) && (val < lookup{romanArr[0]}) ? -1 : 1);
    }

    return num;
}

#
## MAIN
#

[:MCMXC：1990, :MMVIII：2008, :MDCLXVI：1666].each { |pair|

    var arabic = roman2arabic(pair.first) == pair.second ||
        die "Error occurred on #{pair.first}\n";

    say "#{pair.first} in arabic is #{arabic}";
}