Umbraco-CMS/tests/Umbraco.Tests.Benchmarks/EnumeratorBenchmarks.cs

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

namespace Umbraco.Tests.Benchmarks
{
    [MemoryDiagnoser]
    public class EnumeratorBenchmarks
    {
        [Benchmark(Baseline = true)]
        public void WithArray()
        {
            foreach (var t in EnumerateOneWithArray(1)) ;
        }

        [Benchmark]
        public void WithYield()
        {
            foreach (var t in EnumerateOneWithYield(1)) ;
        }

        private IEnumerable<T> EnumerateOneWithArray<T>(T o) => new [] { o };

        private IEnumerable<T> EnumerateOneWithYield<T>(T o)
        {
            yield return o;
        }
    }
}