FREE TRIAL: Accelerate your app development career with Hacking with Swift+! >>

Properties and methods of strings

We’ve used lots of strings so far, and it turns out they are structs – they have their own methods and properties we can use to query and manipulate the string.

First, let’s create a test string:

let string = "Do or do not, there is no try."

You can read the number of characters in a string using its count property:

print(string.count)

They have a hasPrefix() method that returns true if the string starts with specific letters:

print(string.hasPrefix("Do"))

You can uppercase a string by calling its uppercased() method:

print(string.uppercased())

And you can even have Swift sort the letters of the string into an array:

print(string.sorted())

Strings have lots more properties and methods – try typing string. to bring up Xcode’s code completion options.

Hacking with Swift is sponsored by Essential Developer

SPONSORED Join a FREE crash course for iOS devs who want to become complete senior developers — from October 18th to 24th. Learn how to apply iOS app architecture patterns through a series of lectures and practical coding sessions.

Learn more

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: 4.8/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.