hero VS Svelto.ECS

I wanted to use an ECS system in Haskell and I have found apecs and ecstasy. However, both seem to use IntMap for storing component data, so I figured that performance could not be all that great. That's why I created a new library, hero, which uses sparse sets for storing component data. Basic benchmarks seem to suggest that hero is roughly 40 times faster than apecs at iterating over components. The interface for hero is inspired by apecs, but there are some significant differences. The library is still rough around the edges, but you can already find it on https://github.com/Simre1/hero. I have also started work on an sdl2 binding which is in the same repository.

For existing libraries (which you can either choose to use, or choose to reference to look at how they implement ideas), maybe you can take a look at the following. I don't have experience with them, so I don't know how well they are implemented nor whether they strictly adhere to data-oriented design practices to get maximum performance, but it's not always strictly necessary to get the best performance out of everything unless you are writing a 3d AAA game with hundreds of thousands or even millions of entities: * Svelto.ECS - A C# ECS * FLECS - Written in C, but it also has a C# binding and it's a pretty well-regarded ECS implementation * ENTT - "Modern C++" ECS implementation * Bevy - a full game engine with a robust ECS implementation, written in Rust and quite modern.

He is also the author of the C# ECS framework: Svelto.ECS