Roman to Integer | LeetCode 13

AFFILIATE LINKS

Great resource I use to learn algorithms.
40% off Tech Interview Pro: http://techinterviewpro.com/terriblewhiteboard
20% off CoderPro: http://coderpro.com/terriblewhiteboard

Here is the full implementation.

/**
 * @param {string} s
 * @return {number}
 */
let romanToInt = function(s) {
    let romanToInt = {
      I: 1,
      V: 5,
      X: 10,
      L: 50,
      C: 100,
      D: 500,
      M: 1000
    }

    let total = 0;

    for (let i = 0; i < s.length; i++) {
      let currentInt = romanToInt[s.charAt(i)];
      let nextInt = romanToInt[s.charAt(i + 1)];

      if (nextInt) {
        if (currentInt >= nextInt) {
          total += currentInt;
        } else {
          total += (nextInt - currentInt);
          i++;
        }
      } else {
        total += currentInt;
      }
    }

    return total;
};