Callable objects protocol

[Ranando King]

Ok.... maybe I'm thinking a little to literally, but isn't a function
already a callable object?

```js
function obj() {
  return obj.value;
}
obj.value = "value";

assert(obj() === "value");
```

On Tue, Dec 4, 2018 at 1:16 PM Isiah Meadows <isiahmeadows at gmail.com> wrote:

> Edit: the wrapper needs to be a function, so ignore that last email. It's
> wrong.
>
> -----
>
> Isiah Meadows
> contact at isiahmeadows.com
> www.isiahmeadows.com
>
> On Tue, Dec 4, 2018 at 2:14 PM Isiah Meadows <isiahmeadows at gmail.com>
> wrote:
> >
> > BTW, there are proxies [1], and one of the proxy hooks is to intercept
> > calls [2].
> >
> > [1]:
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
> > [2]:
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply
> >
> > Your "callable object" proposal would be literally as simple as this
> > to implement:
> >
> > ```js
> > const callable = Symbol.for("callable")
> > const handler = {
> >     apply(target, thisArg, argsList) {
> >         return Reflect.apply(target[callable], thisArg, argsList)
> >     },
> > }
> > function makeCallable(obj) { return new Proxy(obj, handler) }
> >
> > // Your example, ported
> > const obj = makeCallable({
> >     [callable]: function (...args) { return this[Symbol.for('value')] },
> >     [Symbol.for(''value')]: 'value',
> > })
> >
> > assert(obj() === 'value')
> > obj[callable] = () => 1
> > assert(obj() === 1)
> > ```
> >
> > -----
> >
> > Isiah Meadows
> > contact at isiahmeadows.com
> > www.isiahmeadows.com
> > On Tue, Dec 4, 2018 at 12:02 PM Sultan <thysultan at gmail.com> wrote:
> > >
> > > Something along the lines of Symbol.iterator protocol for defining
> callback objects i.e: Symbol.callable:
> > >
> > > const obj = {
> > >     [Symbol.callable]: function (...args) { return
> this[Symbol.for('value')] },
> > >     [Symbol.for(''value')]: 'value',
> > > }
> > >
> > > assert(obj() === 'value')
> > > _______________________________________________
> > > es-discuss mailing list
> > > es-discuss at mozilla.org
> > > https://mail.mozilla.org/listinfo/es-discuss
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