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//See https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/ for more details.

abstract class Shape {}
abstract class Polygon : Shape
{
    public virtual string NickName {get;}
    public virtual int Sides {get;}
}

class Square : Polygon

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Enumerable.Range(1,10).Select(i => new Random().Next()).ToArray()

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using static 
System.Collections.Immutable.ImmutableArray;

Create<int>(5,4,3,2,1)

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string s = null;

s?.Length

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// This program outputs the names of a given list of digits backwards
//

string GetDigitName(int digit)
{
    switch(digit)
    {
        case 0: return "zero";
        case 1: return "one";
        case 2: return "two";

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nn

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noop

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My VB

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Test

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#include <iostream>
#include <string>

template< class ForwardIt1, class ForwardIt2 >
bool is_subset(ForwardIt1 first1, ForwardIt1 last1,
               ForwardIt2 first2, ForwardIt2 last2)
{
    auto initial = first2;
    
    for (; (first1 != last1) && (first2 != last2); ++first1)