Goat Latin LeetCode solution in JavaScript

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/**
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 * @param {string} S
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 * @return {string}
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 */
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var toGoatLatin = function (S) {
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  let re = /[aeiou]/gi;
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  let word = S.split(" ");
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  let add = 0;
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  let arr = [];
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  for (let i = 0; i < word.length; i++) {
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    if (!word[i].substring(0, 1).match(re)) {
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      arr = word[i].split("");
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      let letter = arr.shift();
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      arr.push(letter);
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      word[i] = arr.join("");
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    }
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    // have to append 'ma' regardless if it starts with a vowel
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    word[i] += "ma";
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    // append 'a' number of times as the index + 1
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    add = i + 1;
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    while (add > 0) {
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      word[i] += "a";
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      add--;
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    }
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  }
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  return word.join(" ");
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};