Minimize XOR

export function minimizeXor(num1: number, num2: number): number {
  const MAX_BITS = 31;
  const totalBitCount = countBits(num2);
 
  let answer = 0;
  for (let bit = MAX_BITS, bitCount = 0; bit >= 0 && bitCount < totalBitCount; bit--) {
    if (isSet(num1, bit) || totalBitCount > bit + bitCount) {
      answer = setBit(answer, bit);
      bitCount += 1;
    }
  }
  return answer;
}
 
function countBits(num: number): number {
  let count = 0;
  while (num > 0) {
    count += num & 1;
    num >>= 1;
  }
  return count;
}
 
function isSet(num: number, bit: number): boolean {
  return (num & (1 << bit)) !== 0;
}
 
function setBit(num: number, bit: number): number {
  return num | (1 << bit);
}