Determine if String Halves Are Alike LeetCode solution in JavaScript

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var halvesAreAlike = function (s) {
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  let isVowel = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"];
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  let count = 0;
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  for (let i = 0; i < s.length / 2; i++) {
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    if (isVowel.indexOf(s[i]) !== -1) {
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      count++;
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    }
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  }
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  for (let i = s.length / 2; i < s.length; i++) {
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    if (isVowel.indexOf(s[i]) !== -1) {
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      count--;
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    }
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  }
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  return count === 0;
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};