Closures can also return values, and they are written similarly to parameters: you write them inside your closure, directly before the in
keyword.
To demonstrate this, we’re going to take our driving()
closure and make it return its value rather than print it directly. Here’s the original:
let driving = { (place: String) in
print("I'm going to \(place) in my car")
}
We want a closure that returns a string rather than printing the message directly, so we need to use -> String
before in
, then use return
just like a normal function:
let drivingWithReturn = { (place: String) -> String in
return "I'm going to \(place) in my car"
}
We can now run that closure and print its return value:
let message = drivingWithReturn("London")
print(message)
SPONSORED Fernando's book will guide you in fixing bugs in three real, open-source, downloadable apps from the App Store. Learn applied programming fundamentals by refactoring real code from published apps. Hacking with Swift readers get a $10 discount!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Link copied to your pasteboard.