Count Vowels Permutation LeetCode solution in JavaScript

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var countVowelPermutation = function (n) {
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  let a = 1,
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    e = 1,
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    i = 1,
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    o = 1,
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    u = 1,
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    mod = 1000000007;
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  while (n-- > 1) {
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    let new_a = a % mod,
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      new_e = e % mod,
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      new_i = i % mod,
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      new_o = o % mod,
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      new_u = u % mod;
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    a = new_e + new_i + new_u;
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    e = new_a + new_i;
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    i = new_e + new_o;
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    o = new_i;
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    u = new_i + new_o;
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  }
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  return (a + e + i + o + u) % mod;
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};