Relationship between globals, Realms, and global environment records

Allen Wirfs-Brock allen at
Tue Nov 25 11:17:05 PST 2014

On Nov 25, 2014, at 11:06 AM, Boris Zbarsky wrote:

> On 11/25/14, 2:02 PM, Allen Wirfs-Brock wrote:
>> I know, I don't see how in you example to rationalize (using ES concepts)  that  'self.x'  evaluate to undefined and  but 'x' evaluates to 'test'.
> "x" is doing a lookup on the global.
> "self" is a proxy whose target is not that global but some other object.

OK, I think I got it.

You're saying that, for a Realm, the global object never changes, but that the (initial values) of 'window', 'self', 'document'(??) etc. are proxies (all the same one?) whose target can dynamically change.

So, yes, that seems to explain things.  It also means that Anne's original  question about "replacing the global" object seems to be relevant as the actual global object binding never changes.


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