Benchmarking various ways of string concatenation
In this demo, i m using BenchmarkDotNet library in order to benchmark various ways of string concatenation :
1️⃣ Using plus operator
2️⃣ Using concat method
3️⃣ Using join method
4️⃣ Using format method
5️⃣ Using interpolation
6️⃣ Using string builder
In order to run benchmarks, type these commands in your favorite terminal :
✍️
.\App.exe --filter StringLittleCollection✍️
.\App.exe --filter StringLargeCollection
| Method | N | Mean | Error | StdDev | Median | Min | Max | Rank | Gen 0 | Gen 1 | Gen 2 | Allocated |
|------------------------- |---- |------------:|-----------:|-------------:|------------:|------------:|-------------:|-----:|--------:|-------:|------:|----------:|
| UsingConcatMethod | 10 | 60.59 ns | 1.157 ns | 2.173 ns | 60.59 ns | 56.87 ns | 66.58 ns | 1 | 0.0391 | - | - | 184 B |
| UsingJoinMethod | 10 | 101.56 ns | 1.470 ns | 1.304 ns | 101.13 ns | 99.82 ns | 104.42 ns | 2 | 0.0391 | - | - | 184 B |
| UsingPlusOperator | 10 | 156.28 ns | 3.102 ns | 2.902 ns | 155.47 ns | 153.09 ns | 161.41 ns | 3 | 0.2294 | 0.0002 | - | 1080 B |
| UsingForeachConcatMethod | 10 | 157.31 ns | 3.100 ns | 3.807 ns | 157.18 ns | 150.97 ns | 163.80 ns | 3 | 0.2294 | 0.0002 | - | 1080 B |
| UsingStringBuilder | 10 | 178.90 ns | 3.128 ns | 2.926 ns | 178.82 ns | 174.38 ns | 184.82 ns | 4 | 0.1547 | 0.0002 | - | 728 B |
| | | | | | | | | | | | | |
| UsingConcatMethod | 50 | 297.74 ns | 5.545 ns | 6.163 ns | 296.15 ns | 289.67 ns | 309.00 ns | 1 | 0.1917 | 0.0005 | - | 904 B |
| UsingJoinMethod | 50 | 499.03 ns | 9.879 ns | 14.787 ns | 496.38 ns | 478.21 ns | 529.30 ns | 2 | 0.1917 | - | - | 904 B |
| UsingStringBuilder | 50 | 617.40 ns | 12.305 ns | 28.761 ns | 615.04 ns | 569.47 ns | 692.43 ns | 3 | 0.5007 | 0.0038 | - | 2360 B |
| UsingForeachConcatMethod | 50 | 2,060.39 ns | 41.094 ns | 81.115 ns | 2,060.96 ns | 1,917.72 ns | 2,275.04 ns | 4 | 4.9362 | 0.0267 | - | 23240 B |
| UsingPlusOperator | 50 | 2,086.83 ns | 45.127 ns | 129.477 ns | 2,052.46 ns | 1,898.97 ns | 2,465.42 ns | 4 | 4.9381 | 0.0267 | - | 23240 B |
| | | | | | | | | | | | | |
| UsingConcatMethod | 100 | 627.03 ns | 12.610 ns | 22.086 ns | 626.70 ns | 592.36 ns | 672.51 ns | 1 | 0.3834 | 0.0019 | - | 1808 B |
| UsingJoinMethod | 100 | 976.96 ns | 15.463 ns | 12.072 ns | 972.20 ns | 965.34 ns | 1,002.37 ns | 2 | 0.3834 | 0.0019 | - | 1808 B |
| UsingStringBuilder | 100 | 1,067.79 ns | 19.917 ns | 33.820 ns | 1,059.53 ns | 1,021.79 ns | 1,161.06 ns | 3 | 0.9251 | 0.0134 | - | 4360 B |
| UsingForeachConcatMethod | 100 | 7,695.66 ns | 151.410 ns | 261.175 ns | 7,673.47 ns | 7,268.24 ns | 8,226.71 ns | 4 | 19.4244 | 0.2136 | - | 91440 B |
| UsingPlusOperator | 100 | 9,836.09 ns | 618.623 ns | 1,794.739 ns | 9,297.54 ns | 7,419.45 ns | 15,033.67 ns | 5 | 19.4244 | 0.2136 | - | 91440 B |
Tools : vs19, net 5.0