Subj : Re: updated jsgen (maybe rc1?) - beta 7
To   : netscape.public.mozilla.jseng
From : Brendan Eich <brendan@meer.net>
Date : Mon Jan 05 2004 09:59 am

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Brendan Eich wrote:

> You want some notion of "scope" that can be deduced from an object.  
> The way in JS (even ECMA has this, for function objects -- see the 
> [[Scope]] internal property) is to walk up the parent chain from the 
> object till you find an object with null parent.  That's the "global 
> scope" for the object you started from, and that's the object in which 
> class-named constructors or prototypes are defined by JS_InitClass. 


So here's the ASCII-art diagram that attempts to depict JS's object 
model.  Hope it helps,

/be



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                                (null)
                                  |
                          +----------------+
                          |Object.prototype|==================++
                          +----------------+                  ||
                               ^  ^                           ||
             +-----------------+  |                           ||
             |                    |                           vv
             |           +------------------+           +-------------+
             |           |Function.prototype|==========>|global object|
             |           +------------------+          _+------------- _
             |                    ^                 __/      ^^ ^^      \_
             |                    |            __'f'         || ||        \_
             |             +--------------+<--.              || ||          \
             |             |function f(){}|==================++ ||           |
             |             +--------------+                     ||          'o'
             |                                                  ||           |
 +----------------------+                                       ||         _/
 |var o = {p:'hi', q:42}|=======================================++       _/
 +----------------------+<--.                                          _/
                             \________________________________________/


Legend:

            ^                         ^^                             .-->
 __proto__  |          __parent__     ||          property  __'id'__/
            |                      ===++                  _/


Not shown: property arcs from global object to Object and Function.

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.