Using Standard Types
In this section, you are going to experiment with standard types in an Xcode playground. A playground lets you write code and see the results without the overhead of creating an application and checking the output.
In Xcode, select File → New → Playground... (or, from the welcome screen, choose Get started with a playground). Make sure the platform is iOS and the template is Blank (Figure 2.2). After clicking Next, you can accept the default name for this file; you will only be here briefly.
Figure 2.2 Configuring a playground
When the file opens, notice that the playground is divided into two sections ...
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