Divide a String Into Groups of Size k LeetCode solution in JavaScript

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/**
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 * @param {string} s
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 * @param {number} k
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 * @param {character} fill
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 * @return {string[]}
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 */
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var divideString = function (s, k, fill) {
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  var ans = [];
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  for (let i = 0; i < s.length; i += k) {
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    ans.push(s.substring(i, i + k));
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  }
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  let str = ans[ans.length - 1];
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  if (str.length == k) {
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    return ans;
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  }
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  for (let i = str.length; i < k; i++) {
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    ans[ans.length - 1] += fill;
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  }
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  return ans;
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};