Learn 2D ARRAYS in JavaScript in 6 minutes! ⬜

// 2D array = multi-dimensional array that stores a matrix
//                    of data in rows and columns.
//                    Useful for games, spreadsheets, or representing images

const matrix = [ [1, 2, 3],
                           [4, 5, 6],
                           [7, 8, 9]];

//matrix[0][0] = 'X';
//matrix[0][1] = 'O';
//matrix[0][2] = 'X';

//matrix[1][0] = 'O';
//matrix[1][1] = 'X';
//matrix[1][2] = 'O';

//matrix[2][0] = 'X';
//matrix[2][1] = 'O';
//matrix[2][2] = 'X';

for(let row of matrix){
   const rowString = row.join(' ');
   console.log(rowString);
}

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