Largest Substring Between Two Equal Characters LeetCode solution in JavaScript

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var maxLengthBetweenEqualCharacters = function (s) {
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  const map = new Map();
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  let max = -1;
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  for (let i = 0; i < s.length; i++) {
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    if (map.has(s[i])) {
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      max = Math.max(max, i - (map.get(s[i]) + 1));
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    } else {
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      map.set(s[i], i);
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    }
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  }
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  return max;
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};