[swift-evolution] Feature proposal: Range operator with step

[Stephen Canon]

> On Apr 6, 2016, at 11:20 AM, Stephen Canon via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> On Apr 6, 2016, at 11:16 AM, Dave Abrahams via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> One question that I *do* think we should answer, is whether the elements
>> of
>> 
>>    (0..<199).striding(by: -2)
>> 
>> are even or odd.
> 
> Odd.  I don’t believe that many real use cases care, but odd is more efficient from a performance perspective.  Needs to be documented clearly, however.

Sorry, I was thinking of (0…199).striding(by: -2).

For the (0..<199) case, Erica’s assessment seems about right, though it isn’t at all obvious how it generalizes to floating point strides.

– Steve
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