Find And Replace in String LeetCode solution in JavaScript

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var findReplaceString = function (s, indices, sources, targets) {
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  let res = s.split("");
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  for (let i = 0; i < indices.length; i++) {
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    let index = indices[i];
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    let str = sources[i];
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    if (s.slice(index, index + str.length) == str) {
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      res[index] = targets[i];
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      for (let j = 1; j < str.length; j++) {
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        res[(index += 1)] = "";
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      }
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    }
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  }
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  return res.join("");
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};