How to write a closure that returns a value
Swift version: 5.4
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 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.
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 trailing closure syntax?
- What is copy on write?
- UIImageWriteToSavedPhotosAlbum(): how to write to the iOS photo album
- 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.
