Minimum Rounds to Complete All Tasks LeetCode solution in JavaScript

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var minimumRounds = function (tasks) {
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  const hash = {};
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  let minRounds = 0;
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  for (const task of tasks) {
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    hash[task] = hash[task] + 1 || 1;
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  }
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  for (const count of Object.values(hash)) {
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    if (count < 2) return -1;
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    minRounds += Math.ceil(count / 3);
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  }
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  return minRounds;
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};