Arrays & Array Methods (map, filter, reduce)

What transformation is being performed on the matrix?

const matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];
const rotated = matrix[0].map((_, colIndex) =>
  matrix.map(row => row[colIndex]).reverse()
);

Horizontal flip
Vertical flip
90-degree rotation
This code performs a 90-degree clockwise matrix rotation: 1) Creates new columns from original rows, 2) Uses nested map() to transform structure, 3) reverse() flips the new columns vertically, 4) First map iterates over column positions, 5) Inner map creates new rows from column values, 6) Maintains matrix dimensions and structure, 7) Common pattern in image processing and games, 8) More efficient than manual element rearrangement.
Matrix transposition

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