LinqLast Performance

gistfile1.txt

|     Method |       Mean |     Error |    StdDev | Ratio |
|----------- |-----------:|----------:|----------:|------:|
|       Linq | 16.8220 ns | 0.4014 ns | 1.1582 ns |  1.00 |
|       Last |  0.9100 ns | 0.0678 ns | 0.1797 ns |  0.06 |
| LastBetter |  0.8448 ns | 0.0645 ns | 0.1482 ns |  0.05 |

Code: 

    public class Benchmark
    {
        private List<int> list;

        [GlobalSetup]
        public void Global()
        {
            list = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        }

        [Benchmark(Baseline = true)]
        public int Linq()
        {
            return list.Last();
        }

        [Benchmark]
        public int Last()
        {
            if (list == null) throw new ArgumentNullException();

            if (list.Count > 0)
                return list[list.Count - 1];

            throw new ArgumentException();
        }

        [Benchmark]
        public int LastBetter()
        {
            var idx = list.Count;

            if (list == null || idx == 0) throw new ArgumentNullException();

            return list[idx - 1];

            throw new ArgumentException();
        }
    }