[swift-evolution] Request for Discussion: Setup closures

[Erica Sadun]

I was specifically referring to value types. I apologize for not being clearer.

-- E


> On Dec 6, 2015, at 12:42 PM, ilya <ilya.nikokoshev at gmail.com> wrote:
> 
> Yes, it works for immutable objects with the correct definition, see the playground contents at https://github.com/ilyannn/iOS-Swift-Materials/blob/master/Playgrounds/Configure.playground/Contents.swift <https://github.com/ilyannn/iOS-Swift-Materials/blob/master/Playgrounds/Configure.playground/Contents.swift>
> 
> On Sun, Dec 6, 2015 at 8:10 PM, Erica Sadun <erica at ericasadun.com <mailto:erica at ericasadun.com>> wrote:
> I have developed something similar as well (http://ericasadun.com/2015/11/15/speeding-up-swift-playgrounds-with-closure-initialization-swiftlang/ <http://ericasadun.com/2015/11/15/speeding-up-swift-playgrounds-with-closure-initialization-swiftlang/>).
> 
> Is yours capable of handling enums and structs that would otherwise be let after declaration because mine is not.
> 
> -- E
> 
> 
>> On Dec 5, 2015, at 5:16 PM, ilya via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> > PROBLEM: With many Apple-supplied classes, typical initializers fail to fully set up an instance for use.  Here's one example: ...
>> 
>> FWIW, I created a configuration operator more then a year ago, and use it in all of my Swift projects:
>> 
>> let task = NSTask() +=+ {
>>     $0.launchPath = "/usr/bin/mdfind"
>>     $0.arguments = ["kMDItemDisplayName == *.playground"]
>>     $0.standardOutput = pipe
>> }
>> 
>> Note you can also use the configured object in the rhs:
>> 
>> let questionLabel = UILabel() +=+ {
>>     $0.textAlignment = .Center
>>     $0.font =  UIFont(name:"DnealianManuscript", size: 72)
>>     $0.text = currentQuestion.questionText
>>     $0.numberOfLines = 0
>>     view.addSubview($0)
>> }
>> 
>> This $0. certainly looks ugly and it would be great to be able to simplify this. I don't llike the following much though (dot-syntax can be ambiguos here, and using simply a method name is even worse):
>> 
>> let questionLabel = UILabel() +=+ {
>>     .textAlignment = .Center
>>     .font =  UIFont(name:"DnealianManuscript", size: 72)
>>     .text = currentQuestion.questionText
>>     .numberOfLines = 0
>>     view.addSubview($0)
>> }
>> 
>> Actually I would be happy with something like
>> 
>> let questionLabel = UILabel() .{
>>     ..textAlignment = .Center
>>     ..font = UIFont(name:"DnealianManuscript", size: 72)
>>     ..text = currentQuestion.questionText
>>     ..numberOfLines = 0
>>     view.addSubview($0)
>> }
>> 
>> Other thoughts?
>> 
>>   
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> 
> 

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