typeof symbol (Was: Sept 19 TC39 Meeting Notes)

Axel Rauschmayer axel at rauschma.de
Sat Sep 29 16:23:30 PDT 2012

> Axel Rauschmayer wrote:
>>> What's the underlying theory for extending instanceof?
>> The idea would be to not use the proto chain (which would be odd for primitive values, anyway), to make these “pseudo-types” special.
> That's not much of a theory :-P. So hardcode two or three special cases? Yikes.

With contracts/guards, it would be more than three cases. One could always introduce a protocol. I’m not saying that that’s the (only) way to do it, I’m just saying that it would be nice not to have to deal with the current “cross-frame, primitive vs. object, [[Class]] vs. instanceof” mess. typeof is already hard-coded.

Dr. Axel Rauschmayer
axel at rauschma.de

home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com

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