1
var romanToInt = function (s) {
2
  const sym = {
3
    I: 1,
4
    V: 5,
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    X: 10,
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    L: 50,
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    C: 100,
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    D: 500,
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    M: 1000,
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  };
11

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  let result = 0;
13

14
  for (let i = 0; i < s.length; i++) {
15
    const cur = sym[s[i]];
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    const next = sym[s[i + 1]];
17

18
    if (cur < next) {
19
      result += next - cur;
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      i++;
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    } else {
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      result += cur;
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    }
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  }
25

26
  return result;
27
};