Oh, wait, just have read Crock's article on => functions. A Python's style of
passing manual `this'? That's interesting (why it's not specified on the wiki?
where Crockford took it from? did you discuss it in a close ECMA meeting?).
Inconsistent again with other functions.
So, let's see, overall we have .. 6 types of functions in JS, and all have
their own specific features. That's again interesting, if won't cause confusion.
Dmitry
On Apr 1, 2012, at 1:13 AM, Dmitry Soshnikov wrote:
>
> On Apr 1, 2012, at 12:34 AM, Axel Rauschmayer wrote:
>
>>>> 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).
>>
>> OK. Ignoring [[Construct]] and .prototype, any other differences?
>
> Well, "ES5-bounds" also do not have `prototype' property, but delegate to the
> target's `prototype'. However, yes, there is the (main) difference in respect
> of supporting TCP (if I understand correctly, since had no time to follow the
> complete thread) -- return and break/continue jumps to the parent frame
> instead of working with the function itself.
>
> Lexical `this' is the only similar thing to bound functions, so we should not
> call => functions as synonym to bound functions. You may say, => function _as
> well as_ a bound captures `this' lexically, but in contrast with it, it has
> other features. In my later analysis, I'll specify them as a new type of
> functions -- AF (Arrow Function) -- in addition to FE, FD, NFE, BF, etc.,
> with many own features, but not just a syntactic sugar -- neither for FE, nor
> for BF.
>
> Dmitry
>
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