CollectionsSelf 4.0 includes a variety of collection objects that serve as containers. We will briefly list the more important ones here; more details can be obtained from the Reference Manual, and of course by browsing the system.
We will describe three major kinds of collections:
1. Vectors. These are fixed-size, ordered collections.
2. Unordered collections, such as sets and dictionaries.
3. Growable, ordered collections, such as lists and sequences.