Concat 50K one char strings with + and StringBuilder in .NET 7

Plus-v-StringBuilder-very-simple-concat.cs

using System.Text;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Reports;

namespace BenchmarkDotNet.Samples
{
    [Config(typeof(Config))]
    [SimpleJob(RuntimeMoniker.Net70)]
    [MemoryDiagnoser]
    [HideColumns(Column.RatioSD, Column.AllocRatio, Column.Error, Column.StdDev)]
    public class StringConcatInLoop
    {
        [Params(50, 50000)]
        public int Total { get; set; }

        [Benchmark(Baseline = true)]
        public string Plus()
        {
            var result = string.Empty;
            for (int i = 0; i < Total; i++)
            {
                result = result + '*';
            }

            return result;
        }

        [Benchmark]
        public string SB()
        {
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < Total; i++)
            {
                result.Append('*');
            }

            return result.ToString();
        }

        private class Config : ManualConfig
        {
            public Config()
            {
                SummaryStyle =
                    SummaryStyle.Default.WithRatioStyle(RatioStyle.Percentage)
                    .WithTimeUnit(Perfolizer.Horology.TimeUnit.Millisecond);
            }
        }
    }
}

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• 1
• 2
• 3

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     • First nested list item
       • Second nested list item

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• George Washington

• John Adams

• Thomas Jefferson

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