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

[Dave Abrahams]

on Tue Apr 05 2016, Xiaodi Wu <xiaodi.wu-AT-gmail.com> wrote:

> On Mon, Apr 4, 2016 at 1:22 PM, Dave Abrahams <dabrahams at apple.com> wrote:
>>
>> on Sat Apr 02 2016, Xiaodi Wu <xiaodi.wu-AT-gmail.com> wrote:
>>
>>> [snip]
>>>
>>> Not included:
>>> 1. I know Ranges are in flux, so I've held off on extending Range with
>>> a striding(by:) method in this proof-of-concept.
>>
>> They're not in flux, except for not having been reviewed yet; they are
>> settled in the swift-3-indexing-model branch.
>
> Did not know that. Will have to study what's there in more detail.
>
>>> 2. No attempt at the suggested stride(from:to:steps:) quite yet.
>>
>> #1 and #2 are mutually exclusive; we prefer #1 as it removes questions
>> about the meaning of "to" or "through."
>
> I wasn't aware that was the thinking. Limiting strides to
> `striding(by:)` removes the ability to express `stride(from: 0, to:
> -10, by: -1)` 

IMO this:

  (-9...0).reverse()

is better than 

  stride(from: 0, to: -10, by: -1)

What do you think?

-- 
Dave