Optimizing $.type()

[willmoffat]

Hi,

I tried profiling scene.render() with 400 cubes. It looks like 20% of the time is spent inside $.type()
This commit reduces it to 2%.

Not exhaustively tested, but it does pass the unit tests ;-)

Nice work on PhiloGL!
--Will

[philogb]

Thanks a lot for your fix :)

type looks like a much faster implementation now, but it does rely on constructor which is a writable property in any object. The previous check was checking directly for the [[Class]] value. (More info here) I'm not sure though I should be that strict; I'll try profiling different approaches on jsperf. I'll get back when the fix is pushed, thanks a lot again :)

[philogb]

Thanks again for the report. This commit:

e992b9c

Increases $.type performance of about 30-50% and still has a robust check based on [[Class]]. You can compare the implementations here. I hope this makes it useful :)

Thanks!