[swift-evolution] [pitch] Variadic Arguments should accept Arrays

Jose Cheyo Jimenez cheyo at masters3d.com
Mon Feb 27 15:49:44 CST 2017

> On Feb 27, 2017, at 1:20 PM, Tino Heth <2th at gmx.de> wrote:
>> These is very unfortunate as a solution for “spreading” a collection or tuple so that It can be applied to function taking a variadic.
>> It makes sense on the declaration site but not on the call site. 
>> someFunc(@nonVariadic [1])  
>> someFunc(@variadic [1]) 
>> There is nothing special about variadic/ spreading that would warrant an attribute. 
>> I think using attributes is not different than using a keyword like c# uses. 
>> http://stackoverflow.com/questions/7580277/why-use-the-params-keyword <http://stackoverflow.com/questions/7580277/why-use-the-params-keyword>
>> Do we really want to tag every array/tuple with a @variadic or @nonVariadic tag when packing and unpacking parameters?
>> variadic/ spreading (AKA packing / unpacking ) is a well known concept to most languages. 
> I have the impression there is a misunderstanding about the proposal:
> It would not only make the variadics-syntax superflous, but also the whole splatting-magic.
> There would only be functions that accept arrays, and you could freely choose to feed them a comma-seperated list instead.
> The attribute would be written in the function declaration only — and we could even decide that it isn't needed at all, and simply accept lists wherever an array is expected.

Perhaps. Implicit splat behavior was removed for Tuples; I don’t see why we would reintroduce it for Array like constructs. 
https://github.com/apple/swift-evolution/blob/master/proposals/0029-remove-implicit-tuple-splat.md#alternatives-considered <https://github.com/apple/swift-evolution/blob/master/proposals/0029-remove-implicit-tuple-splat.md#alternatives-considered>

I am in favor in explicit splat behavior but I don’t see it happening anytime soon. Its tagged as low priority.  

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