Feature Request Add `HasAspect<T>(Entity)`

At the moment there are no APIs to know if an entity satisfies an aspect or not.
Currently, the only form of knowing if an entity has an aspect is by iterating over each component required by the aspect and checking if the entity has it or no, which is... unfortunate.
I propose adding:

Code (CSharp):

1. EntityManager.HasAspect<T>(Entity)
2. SystemAPI.HasAspect<T>(Entity)

Also, TryGet APIs for aspects and components won't be bad either...

 

I agree, also Aspect.Lookup should offer this functionality like ComponentLookup does.
Another workaround is to create an EntityQuery for the Aspect and use EntityQuery.Matches() to check if an Entity has that Aspect.

 

Since Aspects are pretty much only codegen magic, I imagine an API like that would not be any faster than actually checking each component, since that would be happening under the hood anyway.
But I totally agree that it would still be very convenient! The dev team has said in the past that Aspects are still a WIP and that their API would be expanded over time. I mean, not even the devs are using Aspects from what I can tell (TransformAspect was removed last patch because it didn't really serve a purpose anymore). Hopefully that can change in the 1.0 Release or perhaps soon after that, because Aspects can heavily decrease the amount of boilerplate in some situations (like checking for many components' required or optional existence over and over).

Another request I would add is the support of optional EnabledRefRO/RW fields. They are currently broken, and the devs know this (someone reported that a few months ago), yet it still hasn't been fixed. I hope it's still on their radar.