Creating a Playground project

As you learned earlier, launch Xcode and click on Get started with a playground:

The Playground template screen will appear. Make sure that you select iOS and then choose Blank and hit Next. You will be asked to give your project a name and a location to save the file; name your new Playground iOS11-Programming-for-Beginners-Ch4. You can save the file anywhere you like. Now, with the project saved, we can explore Playgrounds a bit.

Next, delete everything inside your file and toggle on the Debug panel using the toggle button (command + shift + Y). You should now have a blank screen with the Results Panel on the right, and the Debug Panel opened at the bottom.

We focused on the basics earlier, and now we will build upon those skills. Ranges are one such data type that we should learn about. These are very useful and can come in handy for a variety of reasons. Let's take a look at what ranges are and then start to understand the difference between a closed range, a half-closed range, and a one-sided range.