Manually go to catch statement of do...catch

Question

I want to test if an array's count is greater than 0, otherwise dismiss the current view.

Right now I'm doing it like this:

do {
    let pets = try self.managedObjectContext.fetch(request)
    guard pets.count > 0 else {
        self.dismiss(animated: true, completion: nil)
    }
    dateCreated = Date(timeIntervalSince1970: Double(pets[0].dateCreated))
} catch {
    self.dismiss(animated: true, completion: nil)
}

I'm wondering if I can just manually send the do..catch into the catch if the count is not greater than 0, that way I don't have to have self.dismiss(animated: true, completion: nil) written twice. Does anybody know if this is possible?

Answer 1

Obviously you don't care about the error therefore you can use try? instead of do-catch:

guard
    let pets = try? self.managedObjectContext.fetch(request), 
    !pets.isEmpty
else {
    self.dismiss(animated: true, completion: nil)
    return 
}

dateCreated = Date(timeIntervalSince1970: Double(pets[0].dateCreated))

Another option is to move the duplicated code into a function/closure, e.g.

let onError: () -> Void = {
   self.dismiss(animated: true, completion: nil)
}

do {
    let pets = try self.managedObjectContext.fetch(request)
    guard pets.count > 0 else {
       onError()
       return
    }
    dateCreated = Date(timeIntervalSince1970: Double(pets[0].dateCreated))
} catch {
    onError()
}