[swift-evolution] [Pitch] Improve `init(repeating:count)`

[Jonathan Hull]

+1

> On Aug 17, 2017, at 2:38 AM, Adrian Zubarev via swift-evolution <swift-evolution at swift.org> wrote:
> 
> This is a small pitch which I will abandon if there is not much appetite for such improvement. ;)
> 
> I would like to propose an improvement to an initializer of all collection types that provide: init(repeating repeatedValue: Element, count: Int).
> 
> This change is meant to support reference type initialization on each iteration of the internal for-loop rather than copying the same references n times.
> 
> The change would be really straightforward and should not break existing code, except that the behavior would change for class types.
> 
> Instead of:
> 
> init(repeating repeatedValue: Element, count: Int)
> 
> let threeViews = Array(repeating: UIView(), count: 3) // contains 1 view 3 times
> we would have:
> 
> init(repeating repeatedValue: @autoclosure () -> Element, count: Int)
> 
> This simple change would allow us to construct an array of different objects instead of an array with n references to the same object.
> 
> let threeViews = Array(repeating: UIView(), count: 3) // contains 3 different views
> 
> 
> 
> 
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