Benchmarks.cs

using System;
using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;

namespace IsInList
{
    [MemoryDiagnoser]
    [SimpleJob(RuntimeMoniker.Net10_0)]
    [SimpleJob(RuntimeMoniker.Net80, baseline: true)]
    [SimpleJob(RuntimeMoniker.Net481)]
    public class Benchmarks
    {

        int[] keys = new int[10_000];


        [GlobalSetup]
        public void Setup()
        {
            var x = new Random(0);
            for (int i = 0; i < 10_000; i++)
            {
                keys[i] = x.Next(0, 63);
            }
        }

        [Benchmark]
        public int IsIn()
        {
            return keys.Count(key => key.IsIn(1, 3, 7));
        }

        [Benchmark]
        public int IsInReadOnly()
        {
            return keys.Count(key => key.IsInReadOnly(1, 3, 7));
        }

        [Benchmark(Baseline = true)]
        public int Contains()
        {
            return keys.Count(key => new int[] { 1, 3, 7 }.Contains(key));
        }

        [Benchmark]
        public int WithIf()
        {
            return keys.Count(key => key == 1 || key == 3 || key == 7);
        }

        [Benchmark]
        public int WithSwitch()
        {
            return keys.Count(key =>
            {
                switch (key)
                {
                    case 1:
                    case 3:
                    case 7:
                        return true;
                }
                return false;
            });
        }

    }
}