Integer Break LeetCode solution in JavaScript

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var integerBreak = function (n) {
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  if (n == 2) return 1;
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  if (n == 3) return 2;
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  if (n == 4) return 4;
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  let c = ~~(n / 3);
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  let d = n % 3;
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  if (d === 0) {
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    return 3 ** c;
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  }
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  if (d === 1) {
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    return 3 ** (c - 1) * 4;
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  }
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  if (d === 2) {
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    return 3 ** c * 2;
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  }
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};