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EmptyCollection.md

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Returning empty collection

Returning empty collection to indicate action does not have anything to return. Is it fine to go with always instantiating empty List<> or is it worth optimizing this as well? (Keep in mind, returned value should be read-only, otherwise you can shoot yourself in the foot).

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19044.1889 (21H2)
Intel Core i7-7820HQ CPU 2.90GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
.NET SDK=6.0.303
  [Host]     : .NET 6.0.8 (6.0.822.36306), X64 RyuJIT
  DefaultJob : .NET 6.0.8 (6.0.822.36306), X64 RyuJIT
Method Categories Mean Error StdDev Median Ratio RatioSD
'Default capacity' List 4.8004 ns 0.1582 ns 0.1480 ns 4.8463 ns 1.00 0.00
'Capacity of 0' List 4.2538 ns 0.1572 ns 0.1227 ns 4.2917 ns 0.89 0.03
'Single pre-created instance' List 0.1082 ns 0.0645 ns 0.0603 ns 0.1346 ns 0.02 0.01
'Default capacity' Dictionary 4.2503 ns 0.0721 ns 0.0639 ns 4.2601 ns 1.00 0.00
'Capacity of 0' Dictionary 6.0897 ns 0.1357 ns 0.1203 ns 6.1034 ns 1.43 0.03
'Single pre-created instance' Dictionary 0.0987 ns 0.0667 ns 0.0624 ns 0.1348 ns 0.02 0.02