iOS -Swift Basics

The Basics

Swift does away with the standard of declaring variables by starting with their type names, and instead opts to use a Javascript-like ‘var’ keyword to define any variable.

So for instance in Objective-C where you have this:

NSString *myString = @"This is my string.";

You now have this:

var myString = "This is my string."

Meanwhile constants are expressed with the ‘let’ keyword

let kSomeConstant = 40

In this case kSomeConstant is implicitly defined as an integer. If you want to be more specific you can specify which type it is like so:

let kSomeConstant: Int = 40

With both arrays and dictionaries, they are described using brackets []

var colorsArray = ["Blue", "Red", "Green", "Yellow"]
var colorsDictionary = ["PrimaryColor":"Green", "SecondaryColor":"Red"]