StringBuilderArray

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