[swift-evolution] [Review] Replace `typealias` keyword with `associatedtype` for associated type declarations

[Ross O'Brien]

It seems no different to me than when "instancetype" was added to Objective
C (though, that doesn't say anything for the 'Swiftiness' of it).

Ross

On Wed, Jan 6, 2016 at 9:08 PM, Jacob Bandes-Storch via swift-evolution <
swift-evolution at swift.org> wrote:

> I'm sure we're just bikeshedding at this point, but...
>
> I find "typealias" and "fallthrough" much easier to read, and easier to
> write, than "associatedtype". Upon further in(tro)spection, I think I'm
> reading typealias and fallthrough as compound words
> <https://en.wikipedia.org/wiki/English_compound>, rather than multiple
> words with no separation, so there is no question that they should be
> all-lowercase.
>
> I find associatedtype harder to interpret as a compound word, so I'd
> expect some separation, either associated_type or associatedType. (I put
> some other suggestions that I like better in my previous email, though.)
>
> Jacob
>
> On Wed, Jan 6, 2016 at 12:56 PM, Loïc Lecrenier <swift-evolution at swift.org
> > wrote:
>
>> >
>> > What about the all lower case “associatedtype”? The underscore
>> alternative of “associated_type” breaks existing language precedent. The
>> camel case version (“associatedType”) does have language precedent, and I
>> wonder if it wouldn’t be a better choice:
>> >
>> >    dynamicType
>> >    didSet
>> >    willSet
>> >
>> > However, there’s also precedent for making paired words all lowercase
>> in keywords:
>> >
>> >    typealias
>> >    fallthrough
>> >    deinit           ←(debatable: could be considered single word or
>> hyphenated)
>> >
>> > Perhaps keyword capitalization conventions deserve some attention
>> across the board.
>>
>> I thought the rules were:
>> - property/method: lowerCamelCase
>> - language keyword: lowercase
>>
>> I consider
>> - dynamicType as a property
>> - didSet, willSet, deinit as methods.
>> - typealias, fallthrough as language keywords
>>
>> And “associatedtype” would be a language keyword too, so it is lowercase
>> 😊
>>
>> Loïc
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>
>
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