When you launch Xcode it will ask you what you want to do, and I’d like you to choose “Get Started with a Playground” – this is a sandbox where you can type Swift code and see immediate results.
The default is a blank playground for iOS, which is fine, so click Next then Create to save it on your desktop.
In this video I want to introduce you to variables, which are places where you can store program data. They are called variables because they can vary – you can change their values freely.
Playgrounds start with a line of code that creates a variable for us:
var str = "Hello, playground"
That creates a new variable called
str, giving it the value “Hello, playground”. On the right of the playground you can see “Hello, playground” in the output area – that’s Xcode showing us the value was set.
str is a variable we can change it:
str = "Goodbye"
We don’t need
var the second time because the variable has already been created – we’re just changing it.
Sponsored You’re already busy updating your app for Swift 4.2 and iOS 12, so why not let Instabug help you find and fix bugs? Add just two lines of code to your project and receive comprehensive reports with all the feedback you need to ship a world-class app – click here to learn more!