JavaScript: Roman numerals

The Romans used the letters of the Latin alphabet to write numbers: I, V, X, L, C, D, M. For example:

• 1 was denoted with the letter I
• 10 with an X
• 7 with VII

The number 2020 in Roman notation is MMXX (2000 = MM, 20 = XX).

solution.js

Implement and export the toRoman() function that converts Arabic numerals to Roman ones. The function takes an integer between 1 and 3000 and returns a string with the Roman representation of that numeral.

Implement and export the toArabic() function, which converts Roman numerals to Arabic ones. If the passed Roman numeral is not correct, the function should return false.

Examples

toRoman(1);
// 'I'
toRoman(59);
// 'LIX'
toRoman(3000);
// 'MMM'

toArabic('I');
// 1
toArabic('LIX');
// 59
toArabic('MMM');
// 3000

toArabic('IIII');
// false
toArabic('VX');
// false

Tips

• Read more about Roman numerals