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

namespace misc_bench
{
    [MemoryDiagnoser]
    public class Benchmarks
    {

        private readonly int[] _items = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        [Benchmark]
        public List<int> LinqSelectWhereToList()
        {
            return _items.Where(x => x % 2 == 0).Select(x => x * 2).ToList();
        }

        [Benchmark]
        public List<int> NewLinqSelectWhereToList()
        {
            return new MyList(_items).Where(x => x % 2 == 0).Select(x => x * 2).ToList();
        }

        [Benchmark]
        public List<int> SelectWhereToListForEach()
        {
            var list = new List<int>();
            foreach (var item in _items)
            {
                if (item % 2 == 0)
                {
                    list.Add(item * 2);
                }
            }
            return list;
        }
    }
}