30秒学会 JavaScript 片段 – Transpose matrix

Transposes a two-dimensional array.

• Use Array.prototype.map() to create the transpose of the given two-dimensional array.

代码实现

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]

翻译自：https://www.30secondsofcode.org/js/s/transpose-matrix