Get the negative of an Optional Chain

Question

This is not allowed (bad expression)

if !(let nsDictionaryObject = swiftObject as? NSDictionary)
{
    "Error could not make NSDictionary in \(self)"
    return
}

Is it possible to check for the negative of an Optional Chain expression in 1 line?

Answer 1

In Swift 2.0, you can use

guard let nsDictionaryObject = swiftObject as? NSDictionary else {
    "Error could not make NSDictionary in \(self)"
    return
}

This will also bind nsDictionaryObject to the scope outside the guard statement.