Function transpose

javascript/0048-rotate-image.js:12–22

(matrix)

};

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

    for (let row = 0; row < rows; row++) {
        /* Time O(ROWS) */
        for (let col = row + 1; col < rows; col++) {
            /* Time O(COLS) */
            swap1(matrix, row, col);
        }
    }
};

var swap1 = (matrix, row, col) =>
    ([matrix[row][col], matrix[col][row]] = [