danny-andrews

export const checkSudoku = (board) => {
  for (let i = 0; i < 4; i++) {
    const row = new Set();
    const col = new Set();
    const square = new Set();
    for (let j = 0; j < 4; j++) {
      const rowEl = board[i][j];
      const colEl = board[j][i];
      const squareEl =
        board[2 * Math.floor(i / 2) + Math.floor(j / 2)][2 * (i % 2) + (j % 2)];