slides

demos/Demo01/ConsoleApp/Program.cs

 using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 using GameBrain;
 using GameConsoleUI;
@@ -77,4 +79,33 @@ namespace ConsoleApp
             return (x, y);
         }
     }
+
+    public class Person
+    {
+        [AllowNull]
+        public string ScreenName
+        {
+            get => _screenName;
+            set => _screenName = value ?? GenerateRandomScreenName();
+        }
+        private string _screenName = GenerateRandomScreenName();
+        
+        [DisallowNull]
+        public string? ReviewComment
+        {
+            get => _comment;
+            set => _comment = value ?? throw new ArgumentNullException(nameof(value), "Cannot set to null");
+        }
+        string? _comment;
+
+        [return: MaybeNull]
+        public T Find<T>(IEnumerable<T> sequence, Func<T, bool> predicate)
+        {
+        }
+
+        public void EnsureCapacity<T>([NotNull] ref T[]? storage, int size)
+        {
+        }
+    }
+    
 }
\ No newline at end of file

demos/Demo01/Directory.Build.props

@@ -2,5 +2,6 @@
     <PropertyGroup>
         <LangVersion>latest</LangVersion>
         <Nullable>enable</Nullable>
+        <WarningsAsErrors>CS8600;CS8602;CS8603;CS8613;CS8618;CS8625</WarningsAsErrors>
     </PropertyGroup>
 </Project>

hw/HOMEWORK.md

@@ -16,7 +16,6 @@ Do not allow user to specify user choices that are already taken (including the
 And think out more fancy functionalities to implement:
 min & max lengths, keyboard based navigation, colors, no duplicate items, default user choice, etc.
 
-
 ## HW02
 
 ***Deadline: 2020-10-14 23:59:59***
@@ -25,7 +24,6 @@ Implement basic battleship game boards, allow 2 players to place bombs on them (
 
 Its not mandatory to save ship settings, or even figure out how to keep track of ships. So just board and bombs.
 
-
 =============================
 
 Battleship initial description