> WeakSets are perfect for branding and are how I would expect web platform
class branding to be explained.
>
> ```js
> const foos = new WeakSet();
>
> class Foo {
> constructor() {
> foos.add(this);
> }
>
> method() {
> if (!foos.has(this)) {
> throw new TypeError("Foo.prototype.method called on an incompatible
object!");
> }
> }
> }
> ```
Just curious, is that effectively the same as what the (current) [private
fields proposal](https://github.com/tc39/proposal-class-fields) offers?
```js
class Foo {
#isFoo = true
method() {
if (this.#isFoo) {
throw new TypeError("Foo.prototype.method called on an incompatible
object!");
}
}
}
```
- Joe
_______________________________________________
es-discuss mailing list
[email protected]
https://mail.mozilla.org/listinfo/es-discuss
