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 manually running an application and checking the output.

In Xcode, select FileNewPlayground.... You can accept the default name for this file; you will only be here briefly. Make sure the platform is iOS (Figure 2.2).

Figure 2.2  Configuring a playground

Configuring a playground

Click Next and save this file in a convenient place.

When the file opens, notice that the playground is divided into two sections (Figure 2.3). The larger white area to the left ...

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