How custom Combine operators and convenience APIs can be implemented using extensions, and how doing so can let us eliminate common sources of boilerplate when implementing things like networking and data validation.

An overview of the sort of patterns and techniques that Swift’s extensions enable us to adopt, and how extensions can turn out to be one of the most powerful features that the language has to offer.

A look at what goes into writing type- and protocol extensions that can be reused between different use cases and projects, and what sort of principles that can be good to keep in mind when doing that.