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

[Dave Abrahams]

on Wed Apr 06 2016, Erica Sadun <erica-AT-ericasadun.com> wrote:

>     On Apr 6, 2016, at 12:16 PM, Dave Abrahams via swift-evolution
>     <swift-evolution at swift.org> wrote:
>     (0..<199).striding(by: -2)
>
>     are even or odd.
>
> (0..<199).striding(by: -2): 0..<199 == 0...198 Even
> (1..<199).striding(by: -2): 1..<199 == 1...198 Even

I understand the logic that got you there, but I find it incredibly
counter-intuitive that striding by 2s over a range with odd endpoints
should produce even numbers... I can't imagine any way I'd be convinced
that was a good idea.

> (0..<198).striding(by: -2): 1..<198 == 0...197 Odd
> (1..<198).striding(by: -2): 1..<198 == 1...197 Odd
>
> -- E
>

-- 
Dave