Lots of beta 4 changes. Look at Airspeed Velocity and Erika Sadun’s lists. To me the major changes are finally getting an equivalent to #pragma mark with //MARK: and changing how C strings are handled. As ever the language is still changing a lot so if you don’t want to keep up with all the changes I’d probably wait a few months.
- 43Nick Lockwood has one of the best discussions of Swift exceptions I’ve found both in terms of design, problems and benefits.