using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Order;

// Represents a person with an ID and a Name
public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
}

[MemoryDiagnoser, RankColumn, Orderer(SummaryOrderPolicy.FastestToSlowest)]
public class LinqPerformanceBenchmark
{
    private List<Person> _personList;
    
    public LinqPerformanceBenchmark()
    {
        _personList = new List<Person>();
        for (int personIndex = 0; personIndex < 100_000; personIndex++)
        {
            _personList.Add(new Person { Id = personIndex, Name = "Person" + personIndex });
        }
    }
    
    [Benchmark]
    public void RetrieveLastPersonUsingLinqLastMethod()
    {
        Person lastPersonUsingLinq = _personList.Last();
    }
    
    [Benchmark]
    public void RetrieveLastPersonUsingIndexer()
    {
        Person lastPersonUsingIndexer = _personList[^1];
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        BenchmarkRunner.Run<LinqPerformanceBenchmark>();
    }
}