Number of Different Integers in a String LeetCode solution in JavaScript

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const CC0 = "0".charCodeAt(0);
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var numDifferentIntegers = function (word) {
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  const numStrSet = new Set();
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  // get numbers as strings
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  const numStrs = word.split(/[^0-9]+/);
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  // drop leading zeros
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  for (const numStr of numStrs) {
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    if (numStr.length > 0) {
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      let i = 0;
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      while (numStr.charCodeAt(i) === CC0) i++;
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      // make sure that we preserve last 0 if string is composed of zeros only
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      numStrSet.add(numStr.slice(i) || "0");
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    }
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  }
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  return numStrSet.size;
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};