Nu har det tillkommit en source med data för demo

Books.ConsoleApp/SearchByTitle.cs

@@ -0,0 +1,28 @@
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Books.ConsoleApp
+{
+
+    public class Search
+    {
+        public static IEnumerable<Book> ByTitle(IEnumerable<Book> books, string titlePartial)
+        {
+            var titlePartialLowercased = titlePartial.ToLower();
+            
+            return books
+                .Where(b =>
+                {
+                    var bookTitleLowercased = b.title.ToLower();
+                    return bookTitleLowercased.Contains(titlePartialLowercased);
+                });
+        }
+
+        public static IEnumerable<Book> SuggestRandom(IEnumerable<Book> books, int count = 5)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}