Transpose matrix

Angelos Chalaris · JavaScript, Array · Apr 20, 2022

Transposes a two-dimensional array.

const transpose = arr => arr[0].map((col, i) => arr.map(row => row[i]));
transpose([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]);
// [[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]

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