In this chapter, we looked at the differences between value types and reference types. We also looked at how to implement copy-on-write and the equatable protocol with our custom types. We can implement the copy-on-write feature with value types that may become. We can implement the equatable protocol for any custom type, including reference types, when we need to compare two instances.
While Swift takes care of managing the memory for us, it is still a good idea to understand how this memory management works so that we can avoid the pitfalls that may cause it to fail. In the next chapter, we will look at how memory management in Swift works and demonstrate how it can fail.