Benchmark.cs

[MemoryDiagnoser]
public class EmptyEnumerator
{
    [Benchmark(Baseline = true)] public bool ArrayEmpty() => Array.Empty<string>().GetEnumerator().MoveNext();

    [Benchmark] public bool ArrayEmptyAsEnumerable() => ((IEnumerable<string>)Array.Empty<string>()).GetEnumerator().MoveNext();

    [Benchmark] public bool ArrayEmptyForEach() 
    {
        foreach (var _ in Array.Empty<string>())
        {
            return true;
        }

        return false;
    }

    [Benchmark] public bool EnumerableEmpty() => Enumerable.Empty<string>().GetEnumerator().MoveNext();
}