Subj : Re: identify intrinsic function
To   : Rufoo <rufoo2001@yahoo.com>
From : Brendan Eich <brendan@meer.net>
Date : Thu Jul 10 2003 11:59 am

Rufoo wrote:

>Is there a way in javascript to identify if an object
>has an explicitly defined 'toString' function or if
>that toString is an intrinsic one?
>

You could use the ECMA-262 Edition 3 standard method, hasOwnProperty, to 
decide whether an object has its own direct property (rather than 
delegates to a prototype object for the given property id):

  if (o.hasOwnProperty('someId')) ...

/be

.