Function reflect

javascript/0048-rotate-image.js:30–42

(matrix)

    ]);

var reflect = (matrix) => {
    const rows = matrix.length;

    for (let row = 0; row < rows; row++) {
        /* Time O(ROWS) */
        for (let col = 0; col < rows / 2; col++) {
            /* Time O(COLS) */
            const reflection = rows - col - 1;

            swap2(matrix, row, col, reflection);
        }
    }
};

var swap2 = (matrix, row, col, reflection) =>
    ([matrix[row][col], matrix[row][reflection]] = [