[swift-evolution] commas optional

[Xiaodi Wu]

On Thu, Oct 12, 2017 at 2:47 PM, Jarod Long via swift-evolution <
swift-evolution at swift.org> wrote:

> I don't really expect this sort of syntactic sugar to be popular enough to
> make it through swift-evolution, and I don't think it's worth the
> distraction from more important priorities at this time, but for what it's
> worth, I've enjoyed this feature in other languages that support it. It
> plays a small part in making code more focused by eliminating unnecessary
> syntax.
>
> I could be wrong, but I'm not so sure that this would actually be source
> breaking. Even if you have something like this:
>
> let points = [
>     Point(
>         x: 1.0,
>         y: 2.0
>     ),
>     Point(
>         x: 3.0,
>         y: 4.0
>     )
> ]
>
> Proper implementation of this feature wouldn't suddenly interpret `Point(`
> as its own element.
>

There are those of us who respect the 80-character line and break
expressions across lines:

let x = [
  NSVeryVeryVeryLongType
    .veryVeryVeryLongProperty +
      NSVeryVeryVeryLongType2
        .veryVeryVeryLongProperty2,
]

It would be a pleasant surprise if a grammar with optional commas can avoid
blowing up existing code; I'm quite doubtful.


On Oct 12, 2017, 12:23 -0700, Josh Parmenter via swift-evolution <
> swift-evolution at swift.org>, wrote:
>
>
>
> On Oct 12, 2017, at 12:17 PM, Kelvin Ma via swift-evolution <
> swift-evolution at swift.org<mailto:swift-evolution at swift.org>> wrote:
>
> a semicolon is a purely syntactic delimiter, the comma on the other hand
> corresponds to physical elements in a collection. I think the two are more
> different than you suggest.
>
>
> I very much agree^
>
> Josh
>
>
>
> Joshua Parmenter | Engineering Lead, Apple Technologies
>
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