Submit Ch3 HW 7 & 8

Src/BootCamp.Chapter/EnumerableExtensions.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace BootCamp.Chapter
+{
+	public static class EnumerableExtensions
+	{
+		public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> values)
+		{
+			List<T> list = new List<T>(values);
+			Random rnd = new Random();
+			int count = list.Count();
+			//Fisher Yates Shuffle
+			for (int i = 0; i < count; i++)
+			{
+				int swapIndex = rnd.Next(i, count);
+				T swapValue = list[swapIndex];
+				list[swapIndex] = list[i];
+				list[i] = swapValue;
+			}
+
+			return list;
+		}
+
+		public static IEnumerable<T> SnapFingers<T>(this IEnumerable<T> values, Predicate<T> predicate)
+		{
+			//Apply predicate
+			List<T> list = values.Where(value => predicate(value)).ToList();
+
+			//Remove half
+			int count = list.Count();
+			int remove = count / 2;
+			return list.Take(count - remove);
+		}
+	}
+}

Src/BootCamp.Chapter/Program.cs

@@ -1,12 +1,87 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
 
 namespace BootCamp.Chapter
 {
-    class Program
-    {
-        static void Main(string[] args)
-        {
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			List<string> names = new List<string>()
+			{
+				"Tyler",
+				"Andrew",
+				"Jakey",
+				"Shea",
+				"Michael"
+			};
 
-        }
-    }
+			//names = names.Shuffle().ToList();
+
+			//names = names.SnapFingers(n => true).ToList();
+
+			LinqStringDemo(names);
+
+			Console.ReadLine();
+		}
+
+		public static void LinqStringDemo(List<string> names)
+		{
+			List<string> names2 = new List<string>()
+			{
+				"Tylor",
+				"Josh",
+				"Shea",
+				"Kyle",
+				"Tyler"
+			};
+
+			Console.WriteLine(GetPrintableList(names));
+
+			//Any
+			bool hasNameWithA = names.Any(name => name.Contains('a'));
+			Console.WriteLine($"Any names contain a?: {hasNameWithA}");
+			bool hasNameWithZ = names.Any(name => name.Contains("z"));
+			Console.WriteLine($"Any names contain z?: {hasNameWithZ}");
+
+			//Count
+			Console.WriteLine($"Number of names containing a: {names.Count(name => name.Contains('a'))}");
+
+			//Order
+			Console.WriteLine($"abc order: {GetPrintableList(names.OrderBy(name => name).ToList())}");
+
+			//Sets
+			Console.WriteLine($"Set 1: {GetPrintableList(names)}");
+			Console.WriteLine($"Set 2: {GetPrintableList(names2)}");
+
+			//Union
+			Console.WriteLine($"All names in both sets: {GetPrintableList(names.Union(names2).ToList())}");
+
+			//Intersection
+			Console.WriteLine($"Names in both sets: {GetPrintableList(names.Intersect(names2).ToList())}");
+
+			//Substraction
+			Console.WriteLine($"Names that are in set 1, but not set 2: {GetPrintableList(names.Except(names2).ToList())}");
+
+			//All 3
+			Console.WriteLine($"Names that aren't in both sets: {GetPrintableList(names.Union(names2).Except(names.Intersect(names2)).ToList())}");
+		}
+
+		public static string GetPrintableList(List<string> names)
+		{
+			StringBuilder sb = new StringBuilder();
+			foreach (string name in names.GetRange(0, names.Count - 1))
+			{
+				sb.Append(name);
+				sb.Append(", ");
+			}
+			sb.Append(names[^1]);
+
+			return sb.ToString();
+		}
+	}
 }