On Fri, Aug 21, 2020 at 11:01 AM 'Carla Pfaff' via golang-nuts
<golang-nuts@googlegroups.com> wrote:
>
> On Friday, 21 August 2020 at 16:46:22 UTC+2 bbse...@gmail.com wrote:
>>
>> All constraints except "any" specify a constraint for the type. A
>> Stringer constraint will ensure that the type has String() string
>> method. "any" is a lack of constraint.
>
>
> The empty interface / any is a constraint that ensures that the type has at
> least 0 methods and all of these 0 methods must match the 0 methods of the
> interface. An empty purse is still a purse, an empty constraint is still a
> constraint.
>
>>
>> My problem is the attractiveness of "any" as a return type.
>
>
> I don't see why anybody would find it attractive as a return type. People
> don't use the empty interface because they like it so much, but because Go
> doesn't have parametric polymorphism / "generics" yet. There are many
> programming languages that have a named top type and it is rarely abused.
> Programmers want to write type safe code if they can.
I disagree. Especially people coming from other languages with a
strong emphasis on DRY tend to overuse interface{}, many times
incorrectly, and generics will not fix that. "any" will make it more
attractive, because it no longer looks like an interface. I agree that
this is a hypothetical problem at this point without any actual
complaints from developers. But defining an alias "any" is easy if you
need it. Providing one predefined is endorsing its use.
>
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