If the compiler can figure out the type of the expression, you can use [:] in place of [NSObject: AnyObject], as below:
let config = URLSessionConfiguration.default var headers = config.httpAdditionalHeaders ?? [:] headers["Some-Additional-Info"] = "1992-08-01" Saagar Jha > On Jul 28, 2016, at 19:08, Kwanghoon Choi via swift-evolution > <[email protected]> wrote: > > Dear swifters. > > I have an proposal for autocreation of optional variables > > This idea came from below situation > > I have to addtional header to NSURLSessionConfiguration like this > > let config = NSURLSessionConfiguration.defaultSessionConfiguration() > config.HTTPAdditionalHeaders?["Some-Additional-Info"] = "1992-08-01" > > here is the problem > > how to be sure not nil for HTTPAdditionalHeaders in > defaultSessionConfiguration > > may be nil or not nil, I read api reference of HTTPAdditionalHeaders but, > did't see for value state of creation. > > yeah, I know. it's optional. so may be I should thought it must be nil. but > really must be? I think it's not very clear logic. > > anyway, HTTPAdditionalHeaders was nil. so i have to solve, and solve like > this. > > let config = NSURLSessionConfiguration.defaultSessionConfiguration() > var headers = config.HTTPAdditionalHeaders ?? [NSObject: AnyObject]() > headers["Some-Additional-Info"] = "1992-08-01" > > May be another way to solve this. > > so I suggest autocreate parameter or something like that > > NSURLSessionConfiguration have this variable > public var HTTPAdditionalHeaders: [NSObject : AnyObject]? > > change above things to like below > public autocreate var HTTPAdditionalHeaders: [NSObject : AnyObject]? { > > create { return [NSObject: AnyObject]() } > > } > > > > let headers = config.HTTPAdditionalHeaders must be return nil > > but > > config.HTTPAdditionalHeaders["SomeThinkConvenient"] = "YEAH~" > > this is automatically create Dictionary and set key and value > > > > What about this idea, Dears? > > > > Thank you for reading. > > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution
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