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.
Because 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 Let’s face it, SwiftUI previews are limited, slow, and painful. Judo takes a different approach to building visually—think Interface Builder for SwiftUI. Build your interface in a completely visual canvas, then drag and drop into your Xcode project and wire up button clicks to custom code. Download the Mac App and start your free trial today!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Link copied to your pasteboard.