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.