Transposing a 2D-array in JavaScript

Question

I\'ve got an array of arrays, something like:

[
    [1,2,3],
    [1,2,3],
    [1,2,3],
]

I would like to transpose it to get the following

Answer 1

One-liner that does not change given array.

a[0].map((col, i) => a.map(([...row]) => row[i]))