On Fri, Jun 7, 2019 at 12:40 PM Michael Ellis <michael.f.el...@gmail.com> wrote:
>
> Count me among those who love the language just the way it is and regard the
> prospect Go 2.0 with dread and loathing born of the Python 3 experience.
>
> That being said, there's one itty-bitty change I'd like to advocate: Allow
> methods on primitives.
>
> I think I understand why allowing new methods on external packages is a bad
> idea because it introduces a form of the fragile superclass problem. But
> surely there's nothing fragile about strings, ints and floats.
>
> Being unable to define a method on a string is *not* a showstopper since one
> can always do "type Foo string" or use type-assertions. It's just that it's
> inelegant in the case of a function that takes a recursive struct as an
> argument if the leaves of the tree are strings. For example
>
> type HTMLTree struct {
> tag string
> attributes string
> content * Content //
> }
>
> type Content interface {
> Render()
> }
>
> // NOT ALLOWED
> func (s string) Render() {
> }
>
> So I have to do something like
>
> type SC string
> func (s SC) Render() {
> }
>
> but that means instead of being able to write
>
> Div("", P("id=1", "When in the course of ..."))
>
> one must use the wrapper type on every content string.
>
> Div("", P("id=1", SC("When in the course of ...")))
>
> Not the end of the world, but uglier than it ought to be, IMO.
>
> Is there a way to get around this or, failing that, an explanation of why
> methods on primitives are verboten?
If one library defines string.Render() for html, and another defines
another string.Render() for, say, a graphics library, which Render
will be called when I call "str".Render()?
>
> Thanks!
>
>
>
>
>
>
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