LambdaDelegates

Benchmark.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using static Rlx.Functions;

namespace Rlx.BenchmarkTests
{
    [MemoryDiagnoser]
    public class MapBenchmark
    {
        [Benchmark]
        public int MapSome()
            => Some(123).Map(x => x * x).Map(x => x + 1).UnwrapOrDefault();
        
        [Benchmark]
        public int MapNone()
            => None<int>().Map(x => x * x).Map(x => x + 1).UnwrapOrDefault();

        [Benchmark]
        public int MapNullInt()
        {
            int? Calculate() => null;
            int? num = Calculate();
            if (num.HasValue) num = num * num;
            if (num.HasValue) num = num + 1;
            return num ?? 0;
        }

        [Benchmark(Baseline = true)]
        public int MapInt()
        {
            int? Calculate() => 123;
            int? num = Calculate();
            if (num.HasValue) num = num * num;
            if (num.HasValue) num = num + 1;
            return num ?? 0;
        }
    }
}

Report.md

BenchmarkDotNet=v0.10.13, OS=ubuntu 16.04
Intel Core i5-2400 CPU 3.10GHz (Sandy Bridge), 1 CPU, 4 logical cores and 4 physical cores
.NET Core SDK=2.1.4
  [Host]     : .NET Core 2.0.5 (CoreCLR 4.6.0.0, CoreFX 4.6.26018.01), 64bit RyuJIT
  DefaultJob : .NET Core 2.0.5 (CoreCLR 4.6.0.0, CoreFX 4.6.26018.01), 64bit RyuJIT

Method	Mean	Error	StdDev	Scaled	Allocated
MapSome	35.980 ns	0.0853 ns	0.0798 ns	3.08	0 B
MapNone	41.736 ns	0.1303 ns	0.1218 ns	3.57	0 B
MapNullInt	8.005 ns	0.0161 ns	0.0126 ns	0.69	0 B
MapInt	11.676 ns	0.0353 ns	0.0330 ns	1.00	0 B