Caitlin, in that example a normal Set works just as well. It can get gc'ed when you leave the iterate function.
On Tue, Jun 2, 2015, 11:25 Caitlin Potter <[email protected]> wrote: > You could use it to avoid bugs involving circular references when > iterating, for example: > > ```js > function iterate(O, fn) { > if (O == null) return O; > let objects = new WeakSet(); > iterate_inner(‘’, O, objects, fn); > return O; > > function iterate_inner(name, O, objects, fn) { > for (let key of Reflect.ownKeys(O)) { > let value = O[key]; > let niceName = name ? `${name}.${key}` : key; > > if (typeof value === “object” && value) { > // Avoid recursing into circular reference > if (objects.has(value)) { > continue; > } else { > fn(value, niceName); > objects.add(value); > iterate_inner(niceName, value, objects, fn); > } > } else { > fn(value, niceName); > } > } > } > } > ``` > > > On Jun 2, 2015, at 11:14 AM, Domenic Denicola <[email protected]> wrote: > > > > 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!"); > > } > > } > > } > > ``` > > > > _______________________________________________ > > es-discuss mailing list > > [email protected] > > https://mail.mozilla.org/listinfo/es-discuss > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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