NEW: Learn SwiftUI with my free YouTube video series! >>

How to write a closure that returns a value

Swift version: 5.0

Paul Hudson    @twostraws   

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")

LEARN SWIFTUI FOR FREE I wrote a massive, free SwiftUI tutorial collection, and also have a growing list of free SwiftUI tutorials on YouTube – get started today!

Available from iOS 8.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

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

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 >>