oriol-bugzilla at hotmail.com (2016-09-04T21:08:57.080Z)
> Could there be a Proxy.hasBeenRevoked(proxy) method?
The `Proxy` constructor only accepts targets and handlers when they are objects and are not revoked proxies.
I wonder what's the point of not allowing revoked proxies but allow revocable proxies which may be revoked later.
Anyways, this allows you to check if a value is a revoked proxy: you only need to ensure that it's an object but makes `Proxy` throw.
I think something like this should work:
```javascript
Proxy.hasBeenRevoked = function(value) {
if(Object(value) !== value) {
return false; // Primitive value
}
try {
new Proxy(value, value);
return false; // Either non-proxy object or non-revoked proxy
} catch(err) {
return true; // Revoked proxy
}
};
```
> Could there be a Proxy.hasBeenRevoked(proxy) method? The Proxy constructor only accepts targets and handlers when they are objects and are not revoked proxies. I wonder what's the point of not allowing revoked proxies but allow revocable proxies which may be revoked later. Anyways, this allows you to check if a value is a revoked proxy: you only need to ensure that it's an object but makes Proxy throw. I think something like this should work: ```javascript Proxy.hasBeenRevoked = function(value) { if(Object(value) !== value) { return false; // Primitive value } try { new Proxy(value, value); return false; // Either non-proxy object or non-revoked proxy } catch(err) { return true; // Revoked proxy } }; ``` -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20160904/11fa8be1/attachment-0001.html>