Fix anagram test + add IsPalindrome

Author: zzzprojects

src/Z.Core/System.String/String.IsAnagram.cs

@@ -4,7 +4,6 @@
 // Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
 // All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
 
-using System;
 using System.Linq;
 
 public static partial class Extensions

src/Z.Core/System.String/String.IsPalindrome.cs

@@ -0,0 +1,23 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using System.Linq;
+using System.Text.RegularExpressions;
+
+public static partial class Extensions
+{
+    /// <summary>A string extension method that query if '@this' is palindrome.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <returns>true if palindrome, false if not.</returns>
+    public static bool IsPalindrome(this string @this)
+    {
+        // Keep only alphanumeric characters
+
+        var rgx = new Regex("[^a-zA-Z0-9]");
+        @this = rgx.Replace(@this, "");
+        return @this.SequenceEqual(@this.Reverse());
+    }
+}

src/Z.Core/Z.Core.csproj

@@ -505,6 +505,7 @@
     <Compile Include="System.Single\_CoreObject\Single.InRange.cs" />
     <Compile Include="System.Single\_CoreObject\Single.NotIn.cs" />
     <Compile Include="System.String\String.Br2Nl.cs" />
+    <Compile Include="System.String\String.IsPalindrome.cs" />
     <Compile Include="System.String\String.IsAnagram.cs" />
     <Compile Include="System.String\String.StripHtml.cs" />
     <Compile Include="System.String\String.ConcatWith.cs" />

test/Z.Core.Test/String.IsAnagram.cs …e.Test/System.String/String.IsAnagram.cstest/Z.Core.Test/String.IsAnagram.cs renamed to test/Z.Core.Test/System.String/String.IsAnagram.cs test/Z.Core.Test/String.IsAnagram.cs renamed to test/Z.Core.Test/System.String/String.IsAnagram.cs

@@ -15,21 +15,21 @@ public class System_String_IsAnagram
         public void IsAnagram()
         {
             // Type
-            string @this = "abba";
+            var @this = "abba";
 
             // Examples
-            bool value1 = @this.IsAnagram("abba");  // return true;
-            bool value2 = @this.IsAnagram("abab");  // return false;
-            bool value3 = @this.IsAnagram("aba");   // return false;
-            bool value4 = @this.IsAnagram("");      // return false;
-            bool value5 = @this.IsAnagram("aba b"); // return false;
+            var value1 = @this.IsAnagram("abba"); // return true;
+            var value2 = @this.IsAnagram("abab"); // return true;
+            var value3 = @this.IsAnagram("aba"); // return false;
+            var value4 = @this.IsAnagram(""); // return false;
+            var value5 = @this.IsAnagram("aba b"); // return false;
 
             // Unit Test
             Assert.IsTrue(value1);
-            Assert.IsFalse(value2);
+            Assert.IsTrue(value2);
             Assert.IsFalse(value3);
             Assert.IsFalse(value4);
             Assert.IsFalse(value5);
         }
     }
-}
+}

test/Z.Core.Test/System.String/String.IsPalindrome.cs

@@ -0,0 +1,33 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Z.Core.Test
+{
+    [TestClass]
+    public class System_String_IsPalindrome
+    {
+        [TestMethod]
+        public void IsPalindrome()
+        {
+
+            // Examples
+            bool value1 = "abba".IsPalindrome();  // return true;
+            bool value2 = "ab ba".IsPalindrome();  // return true;
+            bool value3 = "ab'ba".IsPalindrome();   // return true;
+            bool value4 = "abca".IsPalindrome();      // return false;
+            bool value5 = "ab b ab".IsPalindrome(); // return false;
+
+            // Unit Test
+            Assert.IsTrue(value1);
+            Assert.IsTrue(value2);
+            Assert.IsTrue(value3);
+            Assert.IsFalse(value4);
+            Assert.IsFalse(value5);
+        }
+    }
+}

test/Z.Core.Test/Z.Core.Test.csproj

@@ -61,7 +61,8 @@
   </Choose>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="String.IsAnagram.cs" />
+    <Compile Include="System.String\String.IsPalindrome.cs" />
+    <Compile Include="System.String\String.IsAnagram.cs" />
     <Compile Include="System.Array\Array.ClearAll.cs" />
     <Compile Include="System.Array\Array.WithinIndex.cs" />
     <Compile Include="System.Boolean\Boolean.IfFalse.cs" />