arrow function syntax simplified

Axel Rauschmayer axel at
Sun Apr 1 01:22:53 PDT 2012

> 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.

Arrow functions do not adhere to TCP. Everything you need to know is here:

Dr. Axel Rauschmayer
axel at


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