using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace LinqBench
{
    //[MemoryDiagnoser]
    public class MemoryBenchmarkerDemo
    {
        [Benchmark]
        public int StupidTest()
        {
            int[] nums = { -2, -1, -1, 1, 2, 3, 4, 7, 10, 15, 20, 21, 22, 22, 25, 30 };
            var result = 0;
            for (var i = 0; i < 1000000; i++)
            {
                nums[^1] += 1;
                result = MaximumCount(nums);
            }

            return result;
        }

        public int MaximumCount(int[] nums)
        {
            return Math.Max(
                nums.Count(x => x > 0),
                nums.Count(x => x < 0));
        }

        [Benchmark]
        public int StupidTest2()
        {
            int[] nums = { -2, -1, -1, 1, 2, 3, 4, 7, 10, 15, 20, 21, 22, 22, 25, 30 };
            var result = 0;
            for (var i = 0; i < 1000000; i++)
            {
                nums[^1] += 1;
                result = MaximumCount2(nums);
            }

            return result;
        }

        public int MaximumCount2(int[] nums)
        {
            return Math.Max(
                nums.MyCount(x => x > 0),
                nums.MyCount(x => x < 0));
        }
    }

    file static class Ex
    {
        public static int MyCount(this int[] nums, Func<int, bool> preficate)
        {
            var count = 0;
            foreach (var num in nums)
            {
                if (preficate(num))
                    count++;
            }

            return count;
        }
    }

    internal class Program
    {
        private static void Main(string[] args)
        {
            var summary = BenchmarkRunner.Run<MemoryBenchmarkerDemo>();
        }
    }
}

.NET SDK 7.0.403
  [Host]     : .NET 7.0.13 (7.0.1323.51816), X64 RyuJIT AVX2
  DefaultJob : .NET 7.0.13 (7.0.1323.51816), X64 RyuJIT AVX2


| Method      | Mean      | Error    | StdDev   |
|------------ |----------:|---------:|---------:|
| StupidTest  | 192.31 ms | 0.640 ms | 0.534 ms |
| StupidTest2 |  64.92 ms | 0.272 ms | 0.227 ms |