NEW: Get your ticket to Hacking with Swift Live! >>

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.

Hacking with Swift is sponsored by Essential Developer

SPONSORED From August 2nd to 8th you can join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer!

Save your spot now

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.6/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.