30-seconds-of-code/snippets/js/s/transpose-matrix.md

title, type, language, tags, author, cover, dateModified

title	type	language	tags	author	cover	dateModified
Transpose matrix	snippet	javascript	array	chalarangelo	camera-zoom	2022-04-20T05:00:00-04:00

Transposes a two-dimensional array.

• Use Array.prototype.map() to create the transpose of the given 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]