NEW: My new book Pro SwiftUI is out now – level up your SwiftUI skills today! >>

How to swap two items in an array using swapAt()

Swift version: 5.6

Paul Hudson    @twostraws   

If you need to have two items in an array change places, the swapAt() method is exactly what you want: provide it two indexes inside your array, and the items at those positions will be swapped.

For example, consider this array:

var names = ["Paul", "John", "George", "Ringo"]

If I wanted John and Paul to swap places, I’d swap positions 0 and 1, like this:

names.swapAt(0, 1)

Note: swapAt() will trigger a fatal error if you try to swap beyond the length of the array.

Hacking with Swift is sponsored by Play

SPONSORED Play is the first native iOS design tool created for designers and engineers. You can install Play for iOS and iPad today and sign up to check out the Beta of our macOS app with SwiftUI code export. We're also hiring engineers!

Click to learn more about Play!

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

Available from iOS 8.0

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

BUY OUR BOOKS
Buy Pro Swift Buy Pro SwiftUI 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 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 Beyond Code

Was this page useful? Let us know!

Average rating: 4.2/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.