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 = "StringBuilder")]
        public void StringBuilder()
        {
            _sb.ToString();
        }

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

Method	StrLength	Mean	Ratio	Allocated	Alloc Ratio
StringBuilder	5	1.045 μs	1.00	14.28 KB	1.00
StringBuilderArray	5	18.980 μs	18.20	14.28 KB	1.00
StringBuilder	7	1.658 μs	1.00	18.19 KB	1.00
StringBuilderArray	7	18.900 μs	11.91	18.19 KB	1.00
StringBuilder	10	1.445 μs	1.00	24.05 KB	1.00
StringBuilderArray	10	19.863 μs	13.96	24.05 KB	1.00
StringBuilder	50	7.270 μs	1.00	102.17 KB	1.00
StringBuilderArray	50	21.000 μs	3.43	102.17 KB	1.00
StringBuilder	100	7.833 μs	1.00	199.83 KB	1.00
StringBuilderArray	100	30.762 μs	4.27	199.83 KB	1.00
StringBuilder	1000	492.531 μs	1.00	1957.64 KB	1.00
StringBuilderArray	1000	542.429 μs	1.11	1957.64 KB	1.00
StringBuilder	2500	1,401.836 μs	1.00	4887.33 KB	1.00
StringBuilderArray	2500	1,362.585 μs	0.98	4887.33 KB	1.00
StringBuilder	5000	2,924.100 μs	1.00	9770.14 KB	1.00
StringBuilderArray	5000	2,786.989 μs	0.98	9770.14 KB	1.00
StringBuilder	10000	5,630.200 μs	1.00	19535.77 KB	1.00
StringBuilderArray	10000	5,176.920 μs	0.92	19535.77 KB	1.00
StringBuilder	100000	26,069.379 μs	1.00	195317.02 KB	1.00
StringBuilderArray	100000	20,565.615 μs	0.80	195317.02 KB	1.00
StringBuilder	500000	124,607.154 μs	1.00	976567.02 KB	1.00
StringBuilderArray	500000	105,281.508 μs	0.84	976567.02 KB	1.00
StringBuilder	1071741	192,839.555 μs	1.00	2093248.66 KB	1.00
StringBuilderArray	1071741	153,743.317 μs	0.80	2093248.66 KB	1.00

AppendLine

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

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

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

Method	StrLength	Mean	Ratio	Allocated	Alloc Ratio
StringBuilder	5	16.62 μs	1.00	17.29 KB	1.00
StringBuilderArray	5	16.81 μs	1.02	21.07 KB	1.22
StringBuilder	7	17.74 μs	1.00	32.98 KB	1.00
StringBuilderArray	7	15.84 μs	0.90	21.07 KB	0.64
StringBuilder	10	17.89 μs	1.00	32.98 KB	1.00
StringBuilderArray	10	15.82 μs	0.86	21.07 KB	0.64
StringBuilder	50	19.85 μs	1.00	104.77 KB	1.00
StringBuilderArray	50	15.84 μs	0.80	21.07 KB	0.20
StringBuilder	100	28.90 μs	1.00	214.56 KB	1.00
StringBuilderArray	100	15.95 μs	0.59	21.07 KB	0.10
StringBuilder	1000	95.42 μs	1.00	1978.48 KB	1.00
StringBuilderArray	1000	15.80 μs	0.17	21.07 KB	0.01
StringBuilder	2500	404.60 μs	1.00	4917.34 KB	1.000
StringBuilderArray	2500	16.11 μs	0.05	21.07 KB	0.004
StringBuilder	5000	1,825.35 μs	1.000	9814.2 KB	1.000
StringBuilderArray	5000	16.75 μs	0.009	21.07 KB	0.002
StringBuilder	10000	2,750.18 μs	1.000	19627.59 KB	1.000
StringBuilderArray	10000	15.68 μs	0.006	21.07 KB	0.001
StringBuilder	100000	29,660.86 μs	1.000	195486.03 KB	1.000
StringBuilderArray	100000	16.90 μs	0.001	21.07 KB	0.000
StringBuilder	500000	88,897.48 μs	1.000	976744.34 KB	1.000
StringBuilderArray	500000	16.94 μs	0.000	21.07 KB	0.000
StringBuilder	1071741	99,606.53 μs	1.000	2093416.13 KB	1.000
StringBuilderArray	1071741	17.27 μs	0.000	21.07 KB	0.000

AppendLine + Clear

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

        [Benchmark(Baseline = true, 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 = "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);
            }
        }

Method	StrLength	Mean	Ratio	Allocated	Alloc Ratio
StringBuilder	5	22.59 μs	1.00	33.31 KB	1.00
StringBuilderArray	5	21.73 μs	0.97	41.41 KB	1.24
StringBuilder	7	21.33 μs	1.00	54.1 KB	1.00
StringBuilderArray	7	22.23 μs	1.04	41.41 KB	0.77
StringBuilder	10	22.01 μs	1.00	61.13 KB	1.00
StringBuilderArray	10	20.50 μs	0.96	41.41 KB	0.68
StringBuilder	50	29.93 μs	1.00	207.92 KB	1.00
StringBuilderArray	50	21.05 μs	0.71	41.41 KB	0.20
StringBuilder	100	31.54 μs	1.00	427.09 KB	1.00
StringBuilderArray	100	20.36 μs	0.64	41.41 KB	0.10
StringBuilder	1000	606.54 μs	1.00	3947.25 KB	1.00
StringBuilderArray	1000	21.36 μs	0.04	41.41 KB	0.01
StringBuilder	2500	1,686.58 μs	1.00	9811.89 KB	1.000
StringBuilderArray	2500	20.51 μs	0.01	41.41 KB	0.004
StringBuilder	5000	4,623.29 μs	1.000	19583.76 KB	1.000
StringBuilderArray	5000	21.13 μs	0.005	41.41 KB	0.002
StringBuilder	10000	8,393.39 μs	1.000	39166.66 KB	1.000
StringBuilderArray	10000	20.46 μs	0.002	41.41 KB	0.001
StringBuilder	100000	42,374.85 μs	1.000	390818.06 KB	1.000
StringBuilderArray	100000	21.80 μs	0.001	41.41 KB	0.000
StringBuilder	500000	163,509.21 μs	1.000	1953470.91 KB	1.000
StringBuilderArray	500000	20.45 μs	0.000	41.41 KB	0.000
StringBuilder	1071741	184,949.84 μs	1.000	4186765.65 KB	1.000
StringBuilderArray	1071741	21.60 μs	0.000	41.41 KB	0.000

Insert

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

        [Benchmark(Baseline = true, 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);
        }

        [Benchmark(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);
        }

Method	StrLength	Mean	Ratio	Allocated	Alloc Ratio
StringBuilder	5	1.962 μs	1.00	2.31 KB	1.00
StringBuilderArray	5	3.721 μs	1.88	2.04 KB	0.88
StringBuilder	7	2.079 μs	1.00	3.38 KB	1.00
StringBuilderArray	7	3.737 μs	1.84	2.04 KB	0.60
StringBuilder	10	2.153 μs	1.00	3.38 KB	1.00
StringBuilderArray	10	4.000 μs	1.87	2.04 KB	0.60
StringBuilder	50	3.168 μs	1.00	14.24 KB	1.00
StringBuilderArray	50	3.861 μs	1.26	2.04 KB	0.14
StringBuilder	100	3.164 μs	1.00	27.02 KB	1.00
StringBuilderArray	100	4.023 μs	1.26	2.04 KB	0.08
StringBuilder	1000	10.162 μs	1.00	210.98 KB	1.000
StringBuilderArray	1000	3.784 μs	0.37	2.04 KB	0.010
StringBuilder	2500	20.950 μs	1.00	506.12 KB	1.000
StringBuilderArray	2500	3.828 μs	0.18	2.04 KB	0.004
StringBuilder	5000	40.233 μs	1.00	1022.95 KB	1.000
StringBuilderArray	5000	3.850 μs	0.10	2.04 KB	0.002
StringBuilder	10000	71.107 μs	1.00	2019.62 KB	1.000
StringBuilderArray	10000	3.971 μs	0.06	2.04 KB	0.001
StringBuilder	100000	5,580.048 μs	1.000	20133.65 KB	1.000
StringBuilderArray	100000	3.967 μs	0.001	2.04 KB	0.000
StringBuilder	500000	13,838.945 μs	1.000	100610.3 KB	1.000
StringBuilderArray	500000	3.982 μs	0.000	2.04 KB	0.000
StringBuilder	1071741	15,602.540 μs	1.000	215621.21 KB	1.000
StringBuilderArray	1071741	3.875 μs	0.000	2.04 KB	0.000