If we want to move away from developing with a single file, we need to move away from playgrounds and create our first project. In order to simplify the project, we are going to create a command-line tool. This is a program without a graphical interface. As an exercise, we will redevelop our example program from Chapter 2, Building Blocks – Variables, Collections, and Flow Control which managed invitees to a party. We will develop an app with a graphical interface in Chapter 11, A Whole New World – Developing an App.
To create a new command-line tool project, open Xcode and from the menu bar on the top, select File | New | Project…. A window will appear allowing you to select a template for the project. You should choose Command Line Tool from the OS X | Application menu:
From there, click Next and then give the project a name like Learning Swift Command Line. Any Organization Name and Identifier are fine. Finally, make sure that Swift is selected...