Congratulations! You’ve completed a pretty long and complex lesson. You learned how to:

• Define and conform to custom protocols
• Conform to protocols in the Swift standard library
• Use protocol inheritance
• Provide default protocol implementation using protocol extensions
• Define generic functions
• Define generic types
• Define generic protocols with associated types
• Write functions that return opaque types

You’ll be using protocols and generics extensively as an iOS developer, so make sure to review these concepts!