[swift-evolution] [Pitch] Guard/Catch

Benjamin Spratling bspratling at mac.com
Wed Jul 5 18:59:36 CDT 2017

	I love it!  The “do" blocks never did “feel” like Swift.  I can see how both would be useful.
	I like to use as many conditionals in a single guard statement as I can get away with, so I was concerned that guard/catch would need to interoperate with guard/else.  However, I am fairly convinced that, at least for now, having to choose between guard /catch and guard /else is not that much of a problem.  guard/catch appears optimized for the simple-call case, where there is a single throwing expression, so the code can handle its specific error/s more precisely.  When catching anything in a batch is the goal, then a do block is probably fine.

> On Jul 5, 2017, at 1:30 PM, Soroush Khanlou via swift-evolution <swift-evolution at swift.org> wrote:
> I’d like to propose a guard/catch construct to the language. It would allow code to use throwing functions and handle errors fully, without straying from a happy path. do/catch can be a bit heavy-handed sometimes, and it would be nice to be able to handle throwing functions without committing to all the nesting and ceremony of do/catch.
> Full proposal, which discusses all the corner cases and alternatives:
> https://gist.github.com/khanlou/8bd9c6f46e2b3d94f0e9f037c775f5b9 <https://gist.github.com/khanlou/8bd9c6f46e2b3d94f0e9f037c775f5b9>
> Looking forward to feedback!
> Soroush
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