The components that belong to the entity
The current entity being iterated.
Is the first entity to be iterated on this run of a system. Helpful for setting up state that is the same for all entities only once.
Is the last entity to be iterated on this run of a system. Can be helpful to tear down anything that should be dealt with after all the entites have ran.
The World instance. Use this to access other entities.
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Arguments that are passed into a System function on each iteration. This is how you acces things like the entity that particular entity to act on, as well as some other helpful params like if the entity is the first or last entity in the group of entities that being iterated over.