Benchmarks added & reorganized.

Benchmarks/Contains_LastItems.cs

@@ -0,0 +1,62 @@
+using Collections.Benchmarks.Core;
+
+namespace Recyclable.Collections.Benchmarks
+{
+	public partial class RecyclableCollectionsBenchmarks
+	{
+		public void Array_Contains_LastItems()
+		{
+			var data = TestObjects;
+			var list = TestObjects;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing.With(list.Contains(data[^(i + 1)]));
+			}
+		}
+
+		public void List_Contains_LastItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing.With(list.Contains(data[^(i + 1)]));
+			}
+		}
+
+		public void PooledList_Contains_LastItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsPooledList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing.With(list.Contains(data[^(i + 1)]));
+			}
+		}
+
+		public void RecyclableList_Contains_LastItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsRecyclableList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing.With(list.Contains(data[^(i + 1)]));
+			}
+		}
+
+		public void RecyclableLongList_Contains_LastItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsRecyclableLongList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing.With(list.Contains(data[^(i + 1)]));
+			}
+		}
+	}
+}