What does the arrow ( -> ) between two types mean in Swift?

Question

While researching a separate issue, I came across this SO question: How to create generic closures in Swift

They have a function definition like this:

func saveWithCompletionObject(obj : AnyObject, success : AnyObject -> Void, failure : Void -> Void)

What does the -> in AnyObject -> Void mean?

Answer 1

It’s a function type. AnyObject -> Void is the type of a function accepting AnyObject and returning Void.

Answer 2

success : AnyObject -> Void

This means that success parameter is a function that receives an object (AnyObject) and returns nothing (Void).