From b7514fdeadfc49aa592c0bc56697990c1d81aa8e Mon Sep 17 00:00:00 2001
From: Oliver Booth <me@olivr.me>
Date: Thu, 14 Jan 2021 18:18:52 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=8E=20Improve=20performancee=20on=20st?=
 =?UTF-8?q?ring.IsLower()?=
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Item for #12
---
 X10D/src/StringExtensions.cs | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/X10D/src/StringExtensions.cs b/X10D/src/StringExtensions.cs
index fbf506f..8a88a32 100644
--- a/X10D/src/StringExtensions.cs
+++ b/X10D/src/StringExtensions.cs
@@ -179,14 +179,27 @@
         /// <summary>
         ///     Determines if all alpha characters in this string are considered lowercase.
         /// </summary>
-        /// <param name="str">The input string.</param>
+        /// <param name="value">The input string.</param>
         /// <returns>
         ///     Returns <see langword="true" /> if all alpha characters are lowercase, <see langword="false" />
         ///     otherwise.
         /// </returns>
-        public static bool IsLower(this string str)
+        public static bool IsLower(this string value)
         {
-            return str.Where(char.IsLetter).All(char.IsLower);
+            for (var index = 0; index < value.Length; index++)
+            {
+                if (!char.IsLetter(value[index]))
+                {
+                    continue;
+                }
+
+                if (!char.IsLower(value[index]))
+                {
+                    return false;
+                }
+            }
+
+            return true;
         }
 
         /// <summary>