Collection

Collections are objects that hold other objects that are accessed, placed, and maintained under some set of rules. There are many different ways you could classify these different rules. This package uses one of the simplest, splitting them into four main categories, (Sets, Bags, Seqs, Maps), plus a few `mixin' variants. Top-level functionality is described entirely via interfaces, not classes. This allows some mixing and matching of capabilities at the implementation level, and also enables you to add your own alternative implementations of this functionality that will interoperate with the versions provided in this package.