[swift-evolution] Request for Discussion: Setup closures

[ilya]

> 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?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20151206/4e672e3a/attachment.html>