Find Valid Matrix Given Row and Column Sums LeetCode solution in JavaScript

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var restoreMatrix = function (rowSum, colSum) {
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  let matrix = new Array(rowSum.length);
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  for (let i = 0; i < matrix.length; i++) {
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    matrix[i] = new Array(colSum.length).fill(0);
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  }
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  let helper = function (row, col, mat) {
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    let rowmin = Math.min(...row);
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    let colmin = Math.min(...col);
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    let i = col.indexOf(colmin);
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    let j = row.indexOf(rowmin);
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    if (rowmin === Infinity || colmin === Infinity) return 0;
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    if (rowmin < colmin) {
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      mat[j][i] = rowmin;
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      col[i] -= row[j];
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      row[j] = Infinity;
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    } else {
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      mat[j][i] = colmin;
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      row[j] -= col[i];
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      col[i] = Infinity;
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    }
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    return helper(rowSum, colSum, matrix);
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  };
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  helper(rowSum, colSum, matrix);
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  return matrix;
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};