In this lesson, we've learned the basic language structure and syntax for the Swift programming language. We've now understood the following concepts:
The fundamental structure of Swift programs, and how to use an Xcode playground to develop simple and complex programs
How to create and use mutable and immutable Swift variables
The built-in data types available to Swift programs, and how to select the appropriate data type depending on circumstance
Swift's powerful optional construct for detecting and branching program flow when data values are not available
Swift's type inference and strict type safety syntax and usage
Now that you have the basics well in hand, we're ready to move on to the next lesson, where we'll learn how to use these language elements in complex Swift programs. Specifically, we'll look at the control flow structures and operators offered by Swift.