feat: add append(char value)

Author: linkdotnet

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to **ValueStringBuilder** will be documented in this file. T
 ## Added
 
 - Support for `net9.0`
+- New `Append` overload that accepts a single character
 
 ## [1.18.6] - 2023-11-03
 

src/LinkDotNet.StringBuilder/ValueStringBuilder.Append.cs

@@ -78,11 +78,29 @@ public unsafe void Append(char* value, int length)
     /// Appends a slice of memory.
     /// </summary>
     /// <param name="memory">The memory to add.</param>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void Append(ReadOnlyMemory<char> memory)
     {
         Append(memory.Span);
     }
 
+    /// <summary>
+    /// Appends a single character to the string builder.
+    /// </summary>
+    /// <param name="value">Character to add.</param>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void Append(char value)
+    {
+        var newSize = bufferPosition + 1;
+        if (newSize > buffer.Length)
+        {
+            Grow(newSize);
+        }
+
+        buffer[bufferPosition] = value;
+        bufferPosition++;
+    }
+
     /// <summary>
     /// Adds the default new line separator.
     /// </summary>

tests/LinkDotNet.StringBuilder.UnitTests/ValueStringBuilder.Append.Tests.cs

@@ -196,4 +196,13 @@ public void GivenMultipleValues_WhenCallingAppend_NotCrashing()
 
         builder.ToString().Should().NotBeNull();
     }
+
+    [Fact]
+    public void GivenStringBuilder_WhenAddingSingleCharacter_ThenShouldBeAdded()
+    {
+        using var builder = new ValueStringBuilder();
+        builder.Append('c');
+
+        builder.ToString().Should().Be("c");
+    }
 }