Re: defineProperty is a blacklist

On 16 February 2011 19:04, Daniel Veditz <dveditz@mozilla.com> wrote:

> Is Object.preventExtensions what you want?
>
>
> https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/preventExtensions
>
> Take a look at Object.seal and Object.freeze as well.
>

Hey Daniel, nope those prevent a object being modified or extended but not
to prevent access to a property you don't know about. For example if a
browser added a property to window called "x" which did a redirection and
was not exposed to a for..in loop then the only way to prevent this would be
to know about "x" and overwrite it. A classic blacklist, whitelists are
better.