67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
== Resources
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=== Documentation
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1.exists[List<T>.Exists(Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.array.exists[Array.Exists<T>(T[\], Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.immutable.immutablelist-1.exists[ImmutableList<T>.Exists(Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.any[Enumerable.Any(Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/ef/language-reference/linq-to-entities[LINQ to Entities]
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=== Benchmarks
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[options="header"]
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|===
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| Method | Runtime | Mean | StdDev | Ratio | Allocated
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| Any | .NET 7.0 | 6.670 ms | 0.1413 ms | 1.00 | 40004 B
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| Exists | .NET 7.0 | 1.364 ms | 0.0270 ms | 0.20 | 1 B
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| Any | .NET Framework 4.6.2 | 5.380 ms | 0.0327 ms | 1.00 | 40128 B
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| Exists | .NET Framework 4.6.2 | 1.575 ms | 0.0348 ms | 0.29 | -
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|===
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The results were generated by running the following snippet with https://github.com/dotnet/BenchmarkDotNet[BenchmarkDotNet]:
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[source,csharp]
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----
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private List<int> data;
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private readonly Random random = new Random();
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[Params(1_000)]
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public int N { get; set; }
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[GlobalSetup]
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public void Setup() =>
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data = Enumerable.Range(0, N).Select(x => 43).ToList();
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[Benchmark(Baseline = true)]
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public void Any()
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{
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for (var i = 0; i < N; i++)
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{
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_ = data.Any(x => x % 2 == 0); // Enumerable.Any
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}
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}
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[Benchmark]
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public void Exists()
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{
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for (var i = 0; i < N; i++)
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{
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_ = data.Exists(x => x % 2 == 0); // List<T>.Exists
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}
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}
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----
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Hardware configuration:
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[source]
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----
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BenchmarkDotNet=v0.13.5, OS=Windows 10 (10.0.19045.2846/22H2/2022Update)
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11th Gen Intel Core i7-11850H 2.50GHz, 1 CPU, 16 logical and 8 physical cores
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.NET SDK=7.0.203
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[Host] : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2
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.NET 7.0 : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2
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.NET Framework 4.6.2 : .NET Framework 4.8.1 (4.8.9139.0), X64 RyuJIT VectorSize=256
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----
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