[swift-evolution] [Pitch] New Version of Array Proposal

[Robert Bennett]

I’ll throw my syntax suggestion into the mix: backslashed brackets for the braces, a colon for the separator.

let fsa: \[3: Int\] = \[3: 1, 2, 3\]

Or maybe go the string interpolation route and only backslash the first bracket.

let fsa: \[3: Int] = \[3: 1, 2, 3]

I think that looks pretty clean. For one-dimensional arrays, you could even omit the size and infer the type.

let fsa = \[1, 2, 3] // Of type \[3: Int]

And I agree with Taylor that the separator chosen should have no standalone use in the language — colon, semicolon, pound sign, etc are OK, but operators shouldn’t be used.

> On Jul 23, 2017, at 12:08 PM, Taylor Swift via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Using the multiplication operator as a separator character seems like an extraordinarily bad idea.
> 
> let fsa:[2 * Int] = [2 * 5, 3] // [10, 3] ???
> 
> On Sun, Jul 23, 2017 at 11:59 AM, David Sweeris <davesweeris at mac.com <mailto:davesweeris at mac.com>> wrote:
> 
> 
> Sent from my iPhone
> 
> On Jul 23, 2017, at 08:45, Taylor Swift via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> 
>> 
>> 
>> On Sun, Jul 23, 2017 at 5:29 AM, Adrian Zubarev via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> I wanted to read the proposal, but skipped it as soon as I’ve seen the syntax. From the esthetic point of you the proposed syntax is really ugly. Again I’m not speaking against the feature in general, nor against any of the technical benefits fixed-size array will provide to us. I simply dislike the syntax, which in my opinion does not fit to Swift.
>> 
>> 
>> What about a double colon?
>> 
>> let fsa:[5, 2::Int] = [5, 2::[::0, 0]: 5, [::5, 1]: 6, default: -1]
> 
> I thought we'd mostly settled on "let fsa: [count * Type]" last time this came up.
> 
> - Dave Sweeris 
> 
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