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NET-ToLower-ToUpper.csproj
NET-ToLower-ToUpper.csproj
 
 
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readme.md

🌳 Sustainable Code - String ToUpper vs. ToLower 📊

A small example of string case methods.

Docs:

🔥 Benchmark

BenchmarkDotNet v0.13.9+228a464e8be6c580ad9408e98f18813f6407fb5a, Windows 10 (10.0.19045.3570/22H2/2022Update)
AMD Ryzen 9 5950X, 1 CPU, 32 logical and 16 physical cores
.NET SDK 8.0.100-rc.2.23502.2
  [Host]   : .NET 7.0.13 (7.0.1323.51816), X64 RyuJIT AVX2
  .NET 7.0 : .NET 7.0.13 (7.0.1323.51816), X64 RyuJIT AVX2
  .NET 8.0 : .NET 8.0.0 (8.0.23.47906), X64 RyuJIT AVX2

| Method           | Job      | Runtime  | Mean     | Error    | StdDev   | Gen0   | Allocated |
|----------------- |--------- |--------- |---------:|---------:|---------:|-------:|----------:|
| ToUpperInvariant | .NET 7.0 | .NET 7.0 | 25.55 ns | 0.545 ns | 1.161 ns | 0.0076 |     128 B |
| ToUpperInvariant | .NET 8.0 | .NET 8.0 | 19.28 ns | 0.463 ns | 1.366 ns | 0.0076 |     128 B |
|                  |          |          |          |          |          |        |           |
| ToLower          | .NET 7.0 | .NET 7.0 | 30.91 ns | 0.660 ns | 1.420 ns | 0.0076 |     128 B |
| ToLower          | .NET 8.0 | .NET 8.0 | 19.43 ns | 0.418 ns | 1.002 ns | 0.0076 |     128 B |
|                  |          |          |          |          |          |        |           |
| ToUpper          | .NET 7.0 | .NET 7.0 | 30.04 ns | 0.639 ns | 0.683 ns | 0.0076 |     128 B |
| ToUpper          | .NET 8.0 | .NET 8.0 | 22.03 ns | 0.482 ns | 1.108 ns | 0.0076 |     128 B |
|                  |          |          |          |          |          |        |           |
| ToLowerInvariant | .NET 7.0 | .NET 7.0 | 25.72 ns | 0.550 ns | 1.112 ns | 0.0076 |     128 B |
| ToLowerInvariant | .NET 8.0 | .NET 8.0 | 16.41 ns | 0.372 ns | 0.884 ns | 0.0076 |     128 B |

🏁 Results

  • 🚀 Culuture Invariant-methods are faster, and in most use cases general more correct because invariant casing rules are applied.
  • All tests are about 30% faster in .NET 8 than in .NET 7.

Remarks

  • Do not use a specific case by performance first. The use case is more important!
  • With ToUpper and ToLower pay attention to the fact that the respective language and the character set can affect the results!

⌨️ Run this sample

dotnet run -c Release

Updates

  • 2023/11 - Add .NET 8