Check if Every Row and Column Contains All Numbers LeetCode solution in JavaScript

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var checkValid = function (matrix) {
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  for (let i = 0; i < matrix.length; i++) {
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    const cols = new Set(),
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      rows = new Set(matrix[i]);
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    for (let j = 0; j < matrix.length; j++) {
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      if (matrix[j][i] > matrix.length) return false;
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      cols.add(matrix[j][i]);
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    }
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    if (cols.size < matrix.length || rows.size < matrix.length) return false;
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  }
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  return true;
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};