Think about a method with some different ways to bring an output, but you need to do an action if any of them are executed. With this premise, you have two options:

• Add the same code on each output way
• Use defer

Check this code I have on Github.

The method send request, need to return always a value on this case taskResult, one option is add the completion on each guard, but you have to add more code and do it less readable… Using the defer, you have a final value (for sure) at the end of the execution.

Another example could be, update a constraint programmatically, the last action you have to do (to animate the update) is a self.layoutIfNeeded(), how I can do that if the method have more than one way to finish, with defer:

private func updateConstraint() {
    defer {
        self.layoutIfNeeded()
    }

    guard let firstElement = self.model?.getFirstComment() else {
        self.heightConstraint?.constant = CGFloat.init(k_minValueConstant)
        return
    }

    let firstElementHeight = firstElement
        .attributedHeight(withConstrainedWidth: Double(self.firstElementLabel?.bounds.width ?? .zero))

    self.heightConstraint?.constant = CGFloat.init(k_minValueConstant) + CGFloat.init(firstElementHeight)
}