How to “zip” or “rotate” a variable number of lists?

Question

If I have a list containing an arbitrary number of lists, like so:

var myList = new List>()
{
    new List() { \"a\",          


        

Answer 1

Here's an inefficient variant based on Matrix Transposition:

public static class Ext
{
    public static IEnumerable> Rotate(
        this IEnumerable> src)
    {
        var matrix = src.Select(subset => subset.ToArray()).ToArray();
        var height = matrix.Length;
        var width = matrix.Max(arr => arr.Length);

        T[][] transpose = Enumerable
            .Range(0, width)
            .Select(_ => new T[height]).ToArray();
        for(int i=0; i