Maximum Number of Balls in a Box LeetCode solution in JavaScript

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var countBalls = function (lowLimit, highLimit) {
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  let obj = {};
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  for (let i = lowLimit; i <= highLimit; i++) {
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    i += "";
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    let sum = 0;
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    for (let j = 0; j < i.length; j++) {
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      sum += i[j] * 1;
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    }
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    obj[sum] ? (obj[sum] += 1) : (obj[sum] = 1);
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  }
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  return Math.max(...Object.values(obj));
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};