Ah, the array extras use pass the second argument on to Function.prototype.call. That would indeed be faster. I thought bind() was used, but that makes no sense.
On Oct 25, 2011, at 0:23 , Brendan Eich wrote: > On Oct 24, 2011, at 2:53 PM, Axel Rauschmayer wrote: > >> that = this: >> - Your point is that forEach() and map() have a second parameter that allows >> you to hand in a value for "this", right? >> => I have yet to find a clear argument in favor or against using that = >> this here. Both solutions have performance implications, both solutions add >> an extra line. that = this has two extra tokens, but adding a second >> argument looks awkward. > > We're talking about performance, not "looks". Passing trailing |this| > parameters to the Array extras avoids allocation (bound object or closure) > per extra application. > > /be -- Dr. Axel Rauschmayer [email protected] home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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