[swift-evolution] Modernize Switch/Case Statements?

[Erica Sadun]

> On Jan 31, 2016, at 1:34 AM, Thorsten Seitz via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> 
>> Am 30.01.2016 um 10:39 schrieb Haravikk via swift-evolution <swift-evolution at swift.org>:
>> 
>> Actually, one thing we don’t have in Swift is the ability to just put blocks (curly braces) wherever we like, which in some languages is a useful tool for variable scope when you know you only need something for a short time, but might want to re-use the name.
> 
> You can use a "do" block for that.
> 
> do { ... }
> 
> -Thorsten 

do blocks don't let you introduce parameters for short-lived items:


// this is how I have to do things now

let _ : UILabel = {
    view.addSubview($0)
    CenterViewInSuperview($0,
        horizontal: true, vertical: false)
    $0.text = "Toggle me"
    $0.font = UIFont.boldSystemFontOfSize(36)
    ConstrainViews("V:[view1]-30-[view2]",
        views: $0, mySwitch)
    return $0
}(UILabel())

// vs (this does not exist in the language)

do {
    view.addSubview($0)
    CenterViewInSuperview($0,
        horizontal: true, vertical: false)
    $0.text = "Toggle me"
    $0.font = UIFont.boldSystemFontOfSize(36)
    ConstrainViews("V:[view1]-30-[view2]",
        views: $0, mySwitch)
}(UILabel())

-- E


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