From 14f600666b5622c63f43e6ee52946fbee1e38324 Mon Sep 17 00:00:00 2001
From: Oliver Booth <me@olivr.me>
Date: Thu, 14 Jan 2021 17:09:39 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=8E=20Improve=20performance=20for=20st?=
 =?UTF-8?q?ring.Reverse?=
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Item for #12
---
 X10D/src/StringExtensions.cs | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/X10D/src/StringExtensions.cs b/X10D/src/StringExtensions.cs
index 93920a1..aa05785 100644
--- a/X10D/src/StringExtensions.cs
+++ b/X10D/src/StringExtensions.cs
@@ -265,7 +265,27 @@
         /// <returns>A <see cref="string" /> whose characters are that of <paramref name="value" /> in reverse order.</returns>
         public static string Reverse(this string value)
         {
-            return string.Join(string.Empty, Enumerable.Reverse(value));
+            if (value is null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
+            if (value.Length == 1)
+            {
+                return value;
+            }
+
+            unsafe
+            {
+                var array = stackalloc char[value.Length];
+
+                for (var index = 0; index < value.Length; index++)
+                {
+                    array[index] = value[value.Length - index - 1];
+                }
+
+                return new string(array);
+            }
         }
 
         /// <summary>