On Apr 1, 2012, at 12:12 AM, Axel Rauschmayer wrote:
>> Axel Rauschmayer wrote:
>>> My bad. It is, minus [[Construct]] and *.prototype. I misremembered how
>>> bind() works.
>>>
>>> On Mar 30, 2012, at 0:01 , Axel Rauschmayer wrote:
>>>
>>>> Interesting. So x => x * x is not just syntactic sugar for
>>>>
>>>> function (x) { return x * x }.bind(this)
>
> On Mar 31, 2012, at 2:54 , Brendan Eich wrote:
>
>> We do not want to delegate to a target function that can [[Construct]],
>> because there is no such target function -- we're not trying to sugar .bind
>> on a full function. That is too expensive and general (no pre-args, no full
>> function under the hood).
>
>
> Ah, good. But one can use the above (pseudo-)desugaring to predict the
> behavior of arrow functions, right? That is, there is no observable
> difference.
>
There is, again, the difference in terms of delegation to the target's
[[Construct]] in case of a bound function, see the spec ("bound" per ES5, of
course, since, as Brendan notices, it's not just a syntactic sugar, but a new
special type of functions).
Dmitry
> --
> Dr. Axel Rauschmayer
> [email protected]
>
> home: rauschma.de
> twitter: twitter.com/rauschma
> blog: 2ality.com
>
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