[swift-evolution] Feature proposal: Range operator with step
erica at ericasadun.com
Tue Apr 5 18:51:51 CDT 2016
> On Apr 5, 2016, at 5:22 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> I don't think that's obvious at all, because 0 ≮ 10
Points brought up elsewhere:
* A range does not have direction, it is is an area of variation between lower and upper limits.
* A range does not go from a larger amount to a smaller amount because it is not a sequence
* Much of this problem goes away with striding (as Dave pointed out several times, sorry Dave)
After consideration, I have been persuaded to the opinion that
> stride(from: 0, to: -10, by: -1)
both represent the numbers -9, -8,...,0 better than any alternatives I have offered. I still
prefer the stride version for intent and clarity.
That said, I also prefer my revised SE-0051 semantics for better representing what strides will
attempt to do.
p.s. Thanks all for the patient explanations
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