[swift-evolution] [Draft] Rename Sequence.elementsEqual

Xiaodi Wu xiaodi.wu at gmail.com
Sun Oct 15 02:26:39 CDT 2017

On Sun, Oct 15, 2017 at 1:18 AM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:

> On Sun, Oct 15, 2017 at 12:56 AM, Adam Kemp <adam.kemp at apple.com> wrote:
>> > On Oct 14, 2017, at 10:32 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
>> >
>> > Therefore, it is entirely OK (to me) if the result is something that is
>> so obtuse as to be at first meaningless to most people.
>> I can’t speak for others, but it’s not ok with me. API is UX. It should
>> be understandable and approachable. If this were a function that was
>> considered dangerous and we wanted to discourage its use then maybe I could
>> buy this argument, but I don’t think that’s quite the case here. Even if
>> you don’t think it’s the best API to use or the most common it should still
>> be named clearly.
> I don't disagree with you that it should be _clear_. I'm simply wondering
> out loud whether it is possible to name this method _intuitively_ (i.e.,
> clear without resorting to documentation) given that it lives in the nexus
> of an inherent contradiction between protocol and implementing type which
> is anything but intuitive (or even clear after you read the documentation).
> If it is not possible to name this method _intuitively_, then it is not
> possible to name it _well_. Then, given the option between
> obtuse-but-correct and approachable-but-misleading, I would opt for the
> former as the _least bad_ option.

Hmm, I do think I can squash some of these suggestions into an explicit and
very clear option:


We would then clarify the corresponding precedence function in the same way:


(Lexicographic precedence in contradistinction to length-lexicographic or
Kleene-Brouwer precedence.)

All other "order-dependent" functions, as Apple documentation calls them,
on Set and Dictionary are pretty explicit about being intrinsically
order-dependent (in that they talk about firsts, lasts, starts, ends,
prefixes, suffixes, indices, ranges, dropping, popping, reversing, joining,
or splitting).
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