[swift-evolution] [Review] SE-0122: Use colons for subscript declarations

Leonardo Pessoa me at lmpessoa.com
Wed Jul 20 12:36:00 CDT 2016


I like this syntax better. But do you guys think we could remove this
"subscript" prefix? Could we actually bring subscripts closer to
computed properties by doing something like "var self[externaName
internalName : ParamType] : ElemenType"? That could also support the
idea of creating named subscripts by replacing self with another name.

L


On 20 July 2016 at 14:17, Jose Cheyo Jimenez via swift-evolution
<swift-evolution at swift.org> wrote:
>
> On Jul 20, 2016, at 7:51 AM, Vladimir.S via swift-evolution
> <swift-evolution at swift.org> wrote:
>
> +1 to clean up the syntax of subscripts. They acts as properties, not
> methods, so it is natural to express them with `:` and not with `->`.
>
> Actually, I'd prefer additional change to use [] instead of () in
> declaration like:
>
> subscript[externalName internalName: ParamType] : ElementType {
>    get { … }
>    set { … }
> }
>
>
> I got to second this suggestion. To me this is an elegant solution.
>
> If subscripts are so special that Swift decided to give it its own name (as
> oppose to just making it two functions),
> why not declare it in a special way like the above?
>
> I think that in addition to replacing -> with : if we replaced () with []
> then it would be much clearer that this is not a function or property.
>
> subscript[externalName internalName: ParamType] : ElementType {
>     get { … }
>     set { … }
> }
>
>
> I don’t see another place in the language where [] would make more sense
> than here:
> Otherwise I don’t see  replacing -> with : as a big win like Dmitri Gribenko
> said down thread ->
>
> I think by changing subscripts to use colons we would end in the opposite,
> but
> totally symmetrical situation compared to what we have now.
>
>
>
>
>
> especially if thinking about "Future directions" and confusion with
> parameterised accessor syntax(both declared with `()` but first used with
> `[]` and second with `()`).
>
> On 20.07.2016 8:50, Chris Lattner via swift-evolution wrote:
>
> Hello Swift community,
>
> The review of "SE-0122: Use colons for subscript declarations " begins now
> and runs through July 24. The proposal is available here:
>
> https://github.com/apple/swift-evolution/blob/master/proposals/0122-use-colons-for-subscript-type-declarations.md
>
> Reviews are an important part of the Swift evolution process. All reviews
> should be sent to the swift-evolution mailing list at
>
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
> or, if you would like to keep your feedback private, directly to the review
> manager.
>
> What goes into a review?
>
> The goal of the review process is to improve the proposal under review
> through constructive criticism and contribute to the direction of Swift.
> When writing your review, here are some questions you might want to answer
> in your review:
>
> * What is your evaluation of the proposal?
> * Is the problem being addressed significant enough to warrant a change to
> Swift?
> * Does this proposal fit well with the feel and direction of Swift?
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>
> More information about the Swift evolution process is available at
>
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>
> Thank you,
>
> -Chris Lattner
> Review Manager
>
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