Count Integers With Even Digit Sum LeetCode solution in JavaScript

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var countEven = function (num) {
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  let count = 0;
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  for (let i = 2; i <= num; i++) {
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    if (isEven(i) % 2 == 0) {
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      count++;
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    }
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  }
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  return count;
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};
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const isEven = (c) => {
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  let sum = 0;
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  while (c > 0) {
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    sum += c % 10;
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    c = Math.floor(c / 10);
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  }
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  return sum;
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};