Number of arguments in the method alert

[nidupb]

Hi,
I’m not sure if it’s an errata in the book (p.91, chapter 1) or just myself that misunderstand something. It says that alert() requires two arguments, a binding, and an object.

The attached code is :
.alert(isPresented: self.$alertIsVisible) { Alert(title: Text("Hello there!"), message: Text("This is my first pop-up."), dismissButton: .default(Text("Awesome!"))) }

However, I see one argument within the parenthesis (the binding), and then in the mini program between braces is the object. Am I wrong ?

Also, how would you read the first line in natural language ?
“The method alert … ?”

Thanks for your help and highlights !

[danielmey]

You are correct. The syntax in this case is called “trailing closure syntax“. Because the last (or in this case second) argument to the method is a function (or, to use another term, a closure), you can close the parentheses after the first argument and add the implementation of that function after it in curly braces.
Closures are a more advanced topic and I’m not quite sure why the authors chose to throw it around at that early stage in the book.