> From: Brendan Eich <bren...@mozilla.com> > Date: June 24, 2011 7:00:39 GMT+02:00 > Subject: Re: block-lambda revival
> However, I recall from the last TC39 meeting that some folks on the committee > seemed outraged that block lambda revival (because of TCP conformance -- no > way around this) lexically binds 'this', always. I believe the problem they > had was that they believed shorter function syntax should be neutral on > 'this' binding, to make functions in all their current use-cases more > convenient. I take it their complaint was *not* about performance? I would think that block lambdas would not use a function + bind to achieve lexical this, but some kind of variable renaming/alpha conversion. Thus, performance should not be an anti-lambda argument. On the other hand, |this| not being stored in an environment, alpha conversion might not work (move |this| from the Execution Context State to an the environment???). > This is a difference in risk evaluation or tolerance, perhaps. We should try > to get to the bottom of it. Maybe there should be a list of “functions in all their current use-cases”. I keep thinking that dynamic |this| only matters for methods, but you provided a counter-example. -- Dr. Axel Rauschmayer a...@rauschma.de twitter.com/rauschma home: rauschma.de blog: 2ality.com
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