Parameters after opening bracket

Question

I am doing my first steps in Vapor, the web framework for Swift.

The first piece of code that called my attention was this:

app.get(\"welcome\") { re         


        

Answer 1

This is called trailing closure syntax.

I give a nice rundown of the various syntactic sugars of closures in this answer.

The expanded version of this code would be:

app.get("welcome", { (request: Request) throws -> ResponseRepresentable in 
    return "Hello"
})