[swift-evolution] Proposal: Pattern Matching Partial Function (#111)

Paul Ossenbruggen possen at gmail.com
Thu Feb 4 11:48:44 CST 2016

That is a good point and I forgot about that. There are frequent cases where what I am dealing with is not hashable and it is generally a lot of work to make it hashable, including adding a heading function which if done wrong, can lead to errors.  

Sent from my iPhone

> On Feb 4, 2016, at 8:38 AM, Charles Constant via swift-evolution <swift-evolution at swift.org> wrote:
> I still vote for keeping "cases"
>> I see it as a replacement for dictionary literal "pattern matching":
>> [1 : "one", 2 : "two", 3 : "three"][1] ?? "undefined"
> A dictionary needs keys that are Hashable. A dictionary produces an optional. We've discussed this, and more, earlier in the thread.
>> Even though it would be nice to have but I don’t think that I would use it frequently.
> Granted, it's a bit ugly, but given the choice, I would pick "cases" over "case case case case ..." every time.
>> In addition, to be more consistent with "case", "cases" would introduce pattern matching which doesn’t seem right with this concise syntax.
> I haven't thought this through. It just bums me out a little to replace the switch with something that still has imho unnecessary verbosity.
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