Chapter 5. Collection Types
Collection of values appear everywhere in programs, and Julia has the most important built-in collection types. In Chapter 2, Variables, Types, and Operations, we introduced two important types of collections: arrays and tuples. In this chapter, we will look more deeply at multidimensional arrays (or matrices) and in the tuple type as well. A dictionary type, where you can look up a value through a key, is indispensable in a modern language, and Julia has this too. Finally, we will explore the set type. Like arrays, all these types are parameterized; the type of their elements can be specified at object construction time.
Collections are also iterable types, the types over which we can loop with
for or an iterator producing ...