When to use typealias?

Question

So far I understand that the typealias is a named alias of an existing type. By using typealias, I could do something like:

typealias MyString = String
var str:          


        

Answer 1

The common way to use typealias for me is working with closures:

typealias VoidClosure = () -> Void

func updateFrom(completion: @escaping VoidClosure) { }