How to write a closure that returns a value
Swift version: 5.6
Like regular functions, closures can accept values and return values of your choosing: just write them out at the start of your closure, followed by the word in.
For example, we could write a greeting closure that accepts the name of a person to greet and returns a string using that name:
let greeting = { (name: String) -> String in
return "Hello, \(name)!"
}You can now call that just like any other function, passing in someone’s name as its only parameter:
let message = greeting("Taylor")
SPONSORED You know StoreKit, but you don’t want to do StoreKit. RevenueCat makes it easy to deploy, manage, and analyze in-app subscriptions on iOS and Android so you can focus on building your app.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
Similar solutions…
- How to save a string to a file on disk with write(to:)
- What is copy on write?
- UIImageWriteToSavedPhotosAlbum(): how to write to the iOS photo album
- What is trailing closure syntax?
- How to write text using SKLabelNode
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
