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RE: "var" declarations shadowing properties from Window.prototype

From: Travis Leithead <travis.leithead@microsoft.com>
Date: Wed, 15 Aug 2012 18:27:08 +0000
To: Cameron McCormack <cam@mcc.id.au>, Brendan Eich <brendan@mozilla.com>
CC: Allen Wirfs-Brock <allen@wirfs-brock.com>, Boris Zbarsky <bzbarsky@mit.edu>, "public-script-coord@w3.org" <public-script-coord@w3.org>, "es-discuss@mozilla.org" <es-discuss@mozilla.org>
Message-ID: <9768D477C67135458BF978A45BCF9B3838404F44@TK5EX14MBXW604.wingroup.windeploy.ntdev.microsoft.com>
> From: Cameron McCormack [mailto:cam@mcc.id.au]
> 
> Brendan Eich:
> > As noted, they started out that way 17 years ago. I think WebIDL and
> > interface-based method definition made onload, e.g., predefined on
> > window objects, or more recently on Window.prototype. Was this useful?
> > Was it intended specifically (for window, not just intended generally
> > due to WebIDL's uniform rules for binding its definitions in JS)?
> 
> I don't think it provides any benefit.  Uniformity is the only reason the spec
> says they should be there, currently.

It does provide the monkey-patch benefit for "shared" interfaces (e.g., those shared by inheritance). At the present time, the only one I can think of that [will] act like this is EventTarget (IE10 hasn't yet implemented this hierarchy change).
Received on Wednesday, 15 August 2012 18:27:41 UTC

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