NEW! Pre-order my latest book, Testing Swift! >>

< Previous: Closures summary   Next: Computed properties >

Creating your own structs

Swift lets you design your own types in two ways, of which the most common are called structures, or just structs. Structs can be given their own variables and constants, and their own functions, then created and used however you want.

Let’s start with a simple example: we’re going to create a Sport struct that stores its name as a string. Variables inside structs are called properties, so this is a struct with one property:

struct Sport {
    var name: String
}

That defines the type, so now we can create and use an instance of it:

var tennis = Sport(name: "Tennis")
print(tennis.name)

We made both name and tennis variable, so we can change them just like regular variables:

tennis.name = "Lawn tennis"

Properties can have default values just like regular variables, and you can usually rely on Swift’s type inference.

Upgrade to the premium experience

Get all 40 projects in PDF and ePub, plus exclusive content that will take your Swift learning to the next level – buy the Hacking with Swift book today!

< Previous: Closures summary   Next: Computed properties >
MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>