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StringBuilderArray

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Collect the resulting string without allocating memory.

Benchmark:

ToString 
[IterationSetup]
public void Setup()
{
    _str = new string('S', StrLength);
    _sb = new System.Text.StringBuilder();
    for (int i = 0; i < 1000; i++)
    {
        _sb.AppendLine(_str);
    }

    _sbArr = new StringBuilderArray.StringBuilderArray();
    for (int i = 0; i < 1000; i++)
    {
        _sbArr.AppendLine(_str);
    }
}

[Benchmark(Baseline = true, Description = "StringBuilderArray")]
public void StringBuilderArray()
{
    _sbArr.ToString();
}

[Benchmark(Description = "StringBuilder")]
public void StringBuilder()
{
    _sb.ToString();
}
Method Job Runtime StrLength Mean Ratio Allocated Alloc Ratio
StringBuilderArray .NET 10.0 .NET 10.0 1071741 289,587.367 μs 1.00 2093248.07 KB 1.00
StringBuilder .NET 10.0 .NET 10.0 1071741 318,024.700 μs 1.10 2093248.07 KB 1.00
StringBuilderArray NativeAOT 10.0 NativeAOT 10.0 1071741 292,666.936 μs 1.00 2093248.07 KB 1.00
StringBuilder NativeAOT 10.0 NativeAOT 10.0 1071741 320,468.233 μs 1.10 2093248.07 KB 1.00

AppendLine 
[IterationSetup]
public void Setup()
{
    _str = new string('S', StrLength);
}

[Benchmark(Baseline = true, Description = "StringBuilderArray")]
public void StringBuilderArray()
{
    var sb = new StringBuilderArray.StringBuilderArray();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }
}

[Benchmark(Description = "StringBuilder")]
public void StringBuilder()
{
    var sb = new System.Text.StringBuilder();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }
}

[Benchmark(Description = "DefaultInterpolatedStringHandler")]
public void DefaultInterpolatedStringHandler()
{
    var sb = new DefaultInterpolatedStringHandler();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLiteral(_str);
    }
}
Method Job Runtime StrLength Mean Ratio Allocated Alloc Ratio
StringBuilderArray .NET 10.0 .NET 10.0 1071741 29.945 μs 1.03 20.48 KB 1.00
StringBuilder .NET 10.0 .NET 10.0 1071741 123,382.045 μs 4,229.27 2093438.98 KB 102,196.87
DefaultInterpolatedStringHandler .NET 10.0 .NET 10.0 1071741 231,279.579 μs 7,927.77 2097152.02 KB 102,378.13
StringBuilderArray NativeAOT 10.0 NativeAOT 10.0 1071741 6.277 μs 1.02 20.48 KB 1.00
StringBuilder NativeAOT 10.0 NativeAOT 10.0 1071741 126,442.383 μs 20,631.07 2093440.23 KB 102,196.93
DefaultInterpolatedStringHandler NativeAOT 10.0 NativeAOT 10.0 1071741 227,531.679 μs 37,125.38 2097152.4 KB 102,378.15

AppendLine + Clear 
[IterationSetup]
public void Setup()
{
    _str = new string('S', StrLength);
}

[Benchmark(Baseline = true, Description = "StringBuilderArray")]
public void StringBuilderArray()
{
    var sb = new StringBuilderArray.StringBuilderArray();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }

    sb.Clear();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }
}

[Benchmark(Description = "StringBuilder")]
public void StringBuilder()
{
    var sb = new System.Text.StringBuilder();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }

    sb.Clear();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLine(_str);
    }
}

[Benchmark(Description = "DefaultInterpolatedStringHandler")]
public void DefaultInterpolatedStringHandler()
{
    var sb = new DefaultInterpolatedStringHandler();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLiteral(_str);
    }

    sb.Clear();
    for (int i = 0; i < 1000; i++)
    {
        sb.AppendLiteral(_str);
    }
}
Method Job Runtime StrLength Mean Ratio Allocated Alloc Ratio
StringBuilderArray .NET 10.0 .NET 10.0 1071741 39.325 μs 1.03 40.82 KB 1.00
StringBuilder .NET 10.0 .NET 10.0 1071741 233,685.746 μs 6,141.00 4186788.48 KB 102,566.30
DefaultInterpolatedStringHandler .NET 10.0 .NET 10.0 1071741 466,345.020 μs 12,255.03 2097152.02 KB 51,375.21
StringBuilderArray NativeAOT 10.0 NativeAOT 10.0 1071741 10.092 μs 1.01 40.87 KB 1.00
StringBuilder NativeAOT 10.0 NativeAOT 10.0 1071741 240,078.979 μs 23,996.71 4186789.73 KB 102,448.69
DefaultInterpolatedStringHandler NativeAOT 10.0 NativeAOT 10.0 1071741 455,444.213 μs 45,523.19 2097152.02 KB 51,316.28

Insert 
[IterationSetup]
public void Setup()
{
    _str = new string('S', StrLength);
}

[Benchmark(Baseline = true, Description = "StringBuilderArray")]
public void StringBuilderArray()
{
    var sb = new StringBuilderArray.StringBuilderArray();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(_str);
    }

    sb.Insert(0, _str);

    //in start
    sb.Insert(100, _str);

    //after 5 str from start
    sb.Insert(96, _str);
}

[Benchmark(Description = "StringBuilder")]
public void StringBuilder()
{
    var sb = new System.Text.StringBuilder();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(_str);
    }

    //before 1 str from end
    sb.Insert(99 * _str.Length, _str);

    //in start
    sb.Insert(0, _str);

    //after 5 str from start
    sb.Insert(5 * _str.Length, _str);
}
Method Job Runtime StrLength Mean Ratio Allocated Alloc Ratio
StringBuilderArray .NET 10.0 .NET 10.0 1071741 5.069 μs 1.02 1.45 KB 1.00
StringBuilder .NET 10.0 .NET 10.0 1071741 14,424.515 μs 2,909.17 215628.59 KB 148,389.57
StringBuilderArray NativeAOT 10.0 NativeAOT 10.0 1071741 2.073 μs 1.01 1.45 KB 1.00
StringBuilder NativeAOT 10.0 NativeAOT 10.0 1071741 13,324.245 μs 6,492.04 215629.18 KB 148,389.97