[swift-evolution] Conditional casting and conditional binding: Wierd edge case or flawed design

[Erica Sadun]

If you'd like more context to the conversation:
How do I: Cast an optional string to NSString <http://ericasadun.com/2016/10/08/how-do-i-cast-an-optional-string-to-nsstring/>

-- E


> On Oct 9, 2016, at 6:59 PM, Anton Zhilin <antonyzhilin at gmail.com> wrote:
> 
> A quick fix:
> 
> guard let value = dict["Key"].map({ $0 as NSString }) {
>     use(value)
> }
> Current behavior is quite logical: main purpose of as? is to perform casts, which are not guaranteed to succeed. But I’d say that as? should also support what you want.
> 

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