StringBuilderArray

The version of StringBuilder built on an array of strings string[]: uses less memory.

Benchmark:

        [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);
            }

            var result = sb.ToString();
        }

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

            var result = sb.ToString();
        }

Method	Job	Runtime	StrLength	Mean	Ratio	Gen0	Gen1	Gen2	Allocated	Alloc Ratio
StringBuilder	.NET 7.0	.NET 7.0	5	19.11 μs	1.00	-	-	-	30.98 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	5	31.31 μs	1.62	-	-	-	34.7 KB	1.12
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	5	24.59 μs	1.00	-	-	-	37.77 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	5	14.66 μs	0.60	-	-	-	39.77 KB	1.05
StringBuilder	.NET 7.0	.NET 7.0	7	20.76 μs	1.00	-	-	-	50.59 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	7	32.11 μs	1.58	-	-	-	38.61 KB	0.76
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	7	24.95 μs	1.00	-	-	-	57.35 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	7	14.82 μs	0.60	-	-	-	43.68 KB	0.76
StringBuilder	.NET 7.0	.NET 7.0	10	20.49 μs	1.00	-	-	-	56.45 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	10	31.46 μs	1.49	-	-	-	44.47 KB	0.79
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	10	25.54 μs	1.00	-	-	-	63.21 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	10	15.08 μs	0.59	-	-	-	49.54 KB	0.78
StringBuilder	.NET 7.0	.NET 7.0	50	31.72 μs	1.00	-	-	-	206.36 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	50	34.72 μs	1.22	-	-	-	122.59 KB	0.59
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	50	30.14 μs	1.00	-	-	-	208.5 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	50	14.49 μs	0.48	-	-	-	127.64 KB	0.61
StringBuilder	.NET 7.0	.NET 7.0	100	50.03 μs	1.00	-	-	-	413.8 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	100	38.52 μs	0.95	-	-	-	220.25 KB	0.53
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	100	46.52 μs	1.00	-	-	-	415.86 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	100	24.81 μs	0.57	-	-	-	225.3 KB	0.54
StringBuilder	.NET 7.0	.NET 7.0	1000	761.80 μs	1.00	-	-	-	3935.53 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	1000	527.09 μs	0.71	-	-	-	1978.06 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	1000	722.85 μs	1.00	-	-	-	3940.05 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	1000	538.31 μs	0.77	-	-	-	1983.11 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	2500	1,901.71 μs	1.00	-	-	-	9804.08 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	2500	1,406.46 μs	0.75	-	-	-	4907.75 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	2500	1,817.16 μs	1.00	-	-	-	9818.19 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	2500	1,331.79 μs	0.75	-	-	-	4912.8 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	5000	5,295.15 μs	1.00	1000.0000	-	-	19583.76 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	5000	2,739.29 μs	0.51	-	-	-	9790.56 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	5000	4,455.02 μs	1.00	1000.0000	-	-	19608.41 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	5000	2,670.66 μs	0.59	-	-	-	9795.61 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	10000	9,537.17 μs	1.00	2000.0000	1000.0000	-	39162.77 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	10000	5,241.92 μs	0.55	-	-	-	19556.19 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	10000	11,162.79 μs	1.00	3000.0000	2000.0000	-	39212.8 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	10000	5,184.84 μs	0.47	-	-	-	19561.23 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	100000	55,240.60 μs	1.00	4000.0000	4000.0000	3000.0000	390802.46 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	100000	20,971.15 μs	0.38	-	-	-	195337.44 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	100000	107,904.39 μs	1.00	5000.0000	4000.0000	3000.0000	390850.55 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	100000	49,812.44 μs	0.46	-	-	-	195342.48 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	500000	212,051.93 μs	1.00	5000.0000	4000.0000	4000.0000	1953310.77 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	500000	104,972.60 μs	0.50	-	-	-	976587.44 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	500000	525,755.95 μs	1.00	6000.0000	5000.0000	4000.0000	1953358.61 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	500000	247,554.09 μs	0.47	-	-	-	976592.48 KB	0.50
StringBuilder	.NET 7.0	.NET 7.0	1071741	288,194.84 μs	1.00	5000.0000	4000.0000	4000.0000	4186664.2 KB	1.00
StringBuilderArray	.NET 7.0	.NET 7.0	1071741	152,733.12 μs	0.53	-	-	-	2093269.08 KB	0.50
StringBuilder	.NET Framework 4.8.1	.NET Framework 4.8.1	1071741	1,037,825.78 μs	1.00	6000.0000	5000.0000	4000.0000	4186723.62 KB	1.00
StringBuilderArray	.NET Framework 4.8.1	.NET Framework 4.8.1	1071741	495,930.11 μs	0.48	-	-	-	2093274.13 KB	0.50