https://leetcode.com/problems/roman-to-integer/

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/**
 * @param {string} s
 * @return {number}
 */
var romanToInt = function(s) {
    let sum = 0;
    if (~s.indexOf('IV')) { sum -= 2; }
    if (~s.indexOf('IX')) { sum -= 2; }
    if (~s.indexOf('XL')) { sum -= 20; }
    if (~s.indexOf('XC')) { sum -= 20; }
    if (~s.indexOf('CD')) { sum -= 200; }
    if (~s.indexOf('CM')) { sum -= 200; }
    let map = {
        I: 1,
        V: 5,
        X: 10,
        L: 50,
        C: 100,
        D: 500,
        M: 1000
    };
    s.split('').forEach(e => {
       sum += map[e];
    });
    return sum;
};