> On Jan 4, 2021, at 9:05 AM, Rowan Tommins <rowan.coll...@gmail.com> wrote:
>
> On 04/01/2021 11:15, Markus Fischer wrote:
>> On 03.01.21 12:01, Mike Schinkel wrote:
>>> So in my perfect world this:
>>>
>>> enum BookingStatus {
>>> case PENDING;
>>> case CONFIRMED;
>>> case CANCELLED;
>>> }
>>>
>>> Would be equivalent to:
>>>
>>> enum BookingStatus {
>>> case PENDING = "PENDING";
>>> case CONFIRMED = "CONFIRMED";
>>> case CANCELLED = "CANCELLED";
>>> }
>>
>> I'm with Mikes' suggesting here, see also my previous messages [1] [2].
>>
>> I don't know how to back this up with numbers, but the way I see it the
>> majority of use cases will have a benefit of being able to directly use the
>> literal values derived from the lexical ones and the ability to have custom
>> values is feature next to it.
>
>
> I would personally be OK with this if it was allowed but opt-in, e.g. adding
> the ": string" would default the values in that way, or even something magic
> like ": auto".
>
> I'm still not a fan of having values *always* defined, because I want to be
> able to pick case labels without worrying about whether they make sense as
> values.
>
> For instance, there's a similar maintenance issue to named parameters: having
> a default value means if I write "case PENDING;" in v1.0, I can't change that
> to "case PENDING='P';" or "case PENDING=1;" in v1.1, in case somebody is
> relying on the value being 'PENDING', which was never intended.
You make a good point about being able to define without defaults, and for
being opt-in instead.
A use-case I am thinking about is a long list of application-specific error
codes where you don't want to have to come up two values for each error code
and/or worry about keeping them the same.
I don't quit get how you are thinking of with ": string"; can you give an
example?
Conversely, (something like) this might be a viable way to opt-in default
values:
enum defaults BookingStatus {
case PENDING;
case CONFIRMED;
case CANCELLED;
}
-Mike
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