From cd0095e3c6a63da7f2452ec307847962bf50087b Mon Sep 17 00:00:00 2001
From: Martin Costello <martin@martincostello.com>
Date: Sun, 15 Sep 2024 14:30:33 +0100
Subject: [PATCH] Use ReadOnlySpan<char>.Split() (#557)

- Treat some strings as spans and use their `Split()` method.
- Use `string.Join(char)`.
- Rename variable to theta symbol.
---
 src/ProjectEuler/Puzzles/Puzzle042.cs | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/ProjectEuler/Puzzles/Puzzle042.cs b/src/ProjectEuler/Puzzles/Puzzle042.cs
index ddf984fc..58fe7474 100644
--- a/src/ProjectEuler/Puzzles/Puzzle042.cs
+++ b/src/ProjectEuler/Puzzles/Puzzle042.cs
@@ -51,17 +51,16 @@ internal IList<string> ReadWords()
         using var stream = ReadResource();
         using var reader = new StreamReader(stream);
 
-        string rawWords = reader.ReadToEnd();
+        var text = reader.ReadToEnd().AsSpan();
+        var words = new List<string>();
 
-        string[] split = rawWords.Split(',');
-
-        var words = new List<string>(split.Length);
-
-        foreach (string word in split)
+        foreach (var word in text.Split(','))
         {
-            words.Add(word.Trim('\"'));
+            words.Add(text[word].Trim('\"').ToString());
         }
 
+        words.TrimExcess();
+
         return words;
     }