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code every day with me

Hi, I am going to make #100DaysOfCode Challenge. I will try solve 1 problem from leetcode or hackerrank. Hope you can go with me until end.
This is First day:
-Problem: Roman to integer
*My solution (javascript):

var romanToInt = function(s) {
    let num = new Map([
        ['I',1], ['V',5], ['X',10], ['L',50], ['C',100], ['D',500], ['M',1000]
    for(let i=0;i<s.length;i++){
        if (i == s.length - 1) sum += num.get(s[i])
      else {
        let first = num.get(s[i]);
        let second = num.get(s[i + 1]);
        if (first >= second) sum += first;
        else sum -= first;
    return sum;
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--> If you have better solution or any question, please comment below. I will appreciate.

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