Collections

It's often the case that your program has to process more than one instance of data. For that, we have collection types. Depending on what you want and where your data resides in memory, Rust provides many kinds of built-in types to store a collection of data. First, we have arrays and tuples. Then, we have dynamic collection types in the standard library, of which we'll cover the most commonly used ones, that is, vectors (list of items) and maps (key/value items). Then, we also have references to collection types, called slices, which are basically a view into a contiguous piece of data owned by some other variable. Let's start with arrays first.