Swift is what’s known as a type-safe language, which means that every variable must be of one specific type. The
str variable that Xcode created for us holds a string of letters that spell “Hello, playground”, so Swift assigns it the type
On the other hand, if we want to store someone’s age we might make a variable like this:
var age = 38
That holds a whole number, so Swift assigns the type
Int – short for “integer”.
If you have large numbers, Swift lets you use underscores as thousands separators – they don’t change the number, but they do make it easier to read. For example:
var population = 8_000_000
Strings and integers are different types, and they can’t be mixed. So, while it’s safe to change
str to “Goodbye”, I can’t make it 38 because that’s an
Int not a
SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? Fernando Olivares has a new book containing iOS rules you can immediately apply to your coding habits to see dramatic improvements, while also teaching applied programming fundamentals seen in refactored code from published apps.
Link copied to your pasteboard.