We often write code that returns early, but has to make sure a bit of code
(e.g., a completion handler) is always called whenever we return, which seems
like a great use case for defer. I started to write this:
func execute(with completion: ((Bool) -> Void)?) {
var success = false
defer {
// should always execute with the current state of success at
that time
completion?(success)
}
guard … else {
// completion is expected to be executed with false
return
}
success = true
// completion is expected to be executed with true
}
However, it seems that defer copies the state of success, which means any
update to the variable is not respected, and the completion block is always
called with false.
Is there a way to make this work? I could image to call a function within the
defer block that evaluates the success (e.g., depending on the state of an
instance variable), but using a local variable seems to encapsulate this a lot
better.
Thanks for reading and any advice in advance.
Sebastian
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