Roman Numerics

printRomanNumericValue.js

const romanNumerics = {
  I: 1,
  V: 5,
  X: 10,
  L: 50,
  C: 100,
  D: 500,
  M: 1000
};

const printRomanNumericValue = chars => {
  let positives = 0;
  let negatives = 0;
  for (let i = 0; i < chars.length; i++) {
    const numValue = romanNumerics[chars.charAt(i)];
    const nextNumValue = romanNumerics[chars.charAt(i + 1)] || 0;
    numValue >= nextNumValue
      ? (positives += numValue)
      : (negatives += numValue);
  }
  return positives - negatives;
};
console.log(printRomanNumericValue("XXVI"));