Swift Programming: The Big Nerd Ranch Guide

Structures

A struct is a type that groups a set of related chunks of data together in memory. You use structs when you would like to group data together under a common type. For example, you will create a struct called Town in MonsterTown to model a town with a monster problem.

Making Town a struct encapsulates its data within a single type, and placing its definition in its own file provides a convenient location to find its implementation. In previous chapters, you modeled a town in a playground. Because the example was relatively small, this was not all that limiting. But it is better to encapsulate the definition of the town within its own type. A playground is great for rapidly prototyping some code, but it does not really match ...