roman to integer javascript function

romanToInteger.js

function romanToInteger(roman) {
  const romanNumerals = {
    I: 1,
    V: 5,
    X: 10,
    L: 50,
    C: 100,
    D: 500,
    M: 1000,
  };

  let result = 0;

  for (let i = 0; i < roman.length; i++) {
    const currentSymbol = romanNumerals[roman[i]];
    const nextSymbol = romanNumerals[roman[i + 1]];

    if (nextSymbol && currentSymbol < nextSymbol) {
      result -= currentSymbol;
    } else {
      result += currentSymbol;
    }
  }

  return result;
}