Minimum One Bit Operations to Make Integers Zero LeetCode solution in JavaScript

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/**
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 * @param {number} n
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 * @return {number}
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 */
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var minimumOneBitOperations = function (n) {
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  let answer = 0;
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  let op = 1;
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  let bits = 30;
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  while (bits >= 0) {
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    if (n & (1 << bits)) {
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      let tmp = (1 << (bits + 1)) - 1;
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      answer += tmp * op;
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      op *= -1;
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    }
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    bits--;
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  }
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  return answer;
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};