Checking for Presence of a Component

This is rarely necessary!

The API below is not a primary means to find components in fennecs.

A preferable tool to find entities with certain components are Queries.

An ECS cares little about the individual entity, and so should we all!

Has Component

• Entity.Has<C>(): Checks if the entity/entities has a plain component of type C.
• Entity.Has<R>(Entity relation): Checks if the entity/entities has a relation component of type R with the specified relation.
• Entity.Has<L>(L linkedObject): Checks if the entity/entities has an object link component with the specified linked object.
• Entity.Has<L>(Link<L> link): Checks if the entity/entities has an object link component with the specified link.

All Has methods return a boolean value indicating whether the entity/entities has the specified component. Therefore, they can only be at the end of a chain.

Note: The type parameters C, R, and L have constraints to ensure they are non-null and/or class types.