[swift-users] Tuple Member Extraction in Closure Parameters

[David Sweeris]

Seems like a nice feature, though. I think it'd be worth starting a thread on the evolution list. I don't know if it would be done in time for 3.0, but it doesn't hurt to try.

- Dave Sweeris

> On May 5, 2016, at 09:54, Matthew Johnson via swift-users <swift-users at swift.org> wrote:
> 
> Destructuring of parameters would be pretty cool.  If it gets added to Swift it should be a general feature for all functions, not just on closures.  There are a lot of design directions and subtleties that would need to be explored.  I doubt it is something that will be considered in the Swift 3 timeframe.
> 
>> On May 5, 2016, at 9:43 AM, Dennis Weissmann via swift-users <swift-users at swift.org> wrote:
>> 
>> Thanks Krzysztof, you’re right! I totally forgot about that neat feature.
>> 
>> However, there’s no way to do this directly in the parameter list, right?
>> 
>> Do you think such feature should exist?
>> 
>> - Dennis
>> 
>>>> On May 5, 2016, at 4:19 PM, Krzysztof Siejkowski <krzysztof at siejkowski.net> wrote:
>>>> 
>>>> 
>>>> A workaround is to declare two local variables:
>>>> 
>>>> let e = zip(a,b).reduce(0) { acc, tuple in
>>>>   let value1 = tuple.0
>>>>   let value2 = tuple.1
>>>>   return acc + value1 + value2
>>>> }
>>> 
>>> You can also get away with one assignment:
>>> 
>>> let ok = zip(a,b).reduce(0) { acc, tuple in
>>>     let (value1, value2) = tuple
>>>     return acc + value1 + value2
>>> 
>>> }
>>> 
>>> Best,
>>> Krzysztof
>> 
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