FREE: Follow my new 100 Days of Swift challenge! >>

< Previous: Mutating methods   Next: Properties and methods of arrays >

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.

Sponsored You’re already busy updating your app for Swift 4.2 and iOS 12, so why not let Instabug help you find and fix bugs? Add just two lines of code to your project and receive comprehensive reports with all the feedback you need to ship a world-class app – click here to learn more!

< Previous: Mutating methods   Next: Properties and methods of arrays >
MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns 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 Advanced iOS Volume Two 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 >>