Chapter 4. Writing Functions and Closures

We’ve covered a lot up to this point in the book: variables, constants, dictionaries, arrays, looping constructs, control structures, and the like. You’ve used both the REPL command-line interface and now Xcode 6’s playgrounds feature to type in code samples and explore the language.

Up to this point, however, you have been limited to mostly experimentation: typing a line or three here and there and observing the results. Now it’s time to get more organized with your code. In this chapter, you’ll learn how to tidy up your Swift code into nice clean reusable components called functions.

Let’s start this chapter with a fresh, new playground file. If you haven’t already done so, launch Xcode 6 and create ...

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