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toRomanNumeral javascript Code Snippet in 2024

mathstringintermediate

Last Updated: 20 April 2024

Converts an integer to its roman numeral representation. Accepts value between 1 and 3999 (both inclusive).

  • Create a lookup table containing 2-value arrays in the form of (roman value, integer).
  • Use Array.prototype.reduce() to loop over the values in lookup and repeatedly divide num by the value.
  • Use String.prototype.repeat() to add the roman numeral representation to the accumulator.
const toRomanNumeral = num => { const lookup = [ ['M', 1000], ['CM', 900], ['D', 500], ['CD', 400], ['C', 100], ['XC', 90], ['L', 50], ['XL', 40], ['X', 10], ['IX', 9], ['V', 5], ['IV', 4], ['I', 1], ]; return lookup.reduce((acc, [k, v]) => { acc += k.repeat(Math.floor(num / v)); num = num % v; return acc; }, ''); };
toRomanNumeral(3); // 'III' toRomanNumeral(11); // 'XI' toRomanNumeral(1998); // 'MCMXCVIII'

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