Isomorphic Strings LeetCode solution in JavaScript

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/**
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 * @param {string} s
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 * @param {string} t
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 * @return {boolean}
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 */
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var isIsomorphic = function (s, t) {
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  const obj = {};
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  const setValues = new Set();
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  let isIso = true;
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  for (var indexI = 0; indexI < s.length; indexI++) {
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    if (obj[s[indexI]] || setValues.has(t[indexI])) {
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      if (obj[s[indexI]] === t[indexI]) continue;
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      isIso = false;
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      break;
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    } else {
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      obj[s[indexI]] = t[indexI];
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      setValues.add(t[indexI]);
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    }
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  }
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  return isIso;
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};