Irakli Gozalishvili wrote:
Sorry for not being clear about this. Here is a simplified example of
the implementation:
https://gist.github.com/2911817
Also this is just a single particular example, but I expect there to
be more. I think what I'm
really asking for is a way to know if …rest is being used.
Your code doesn't work on a function that uses arguments the old
fashioned way, though.
Yes, you can make ...rest affect .length and make a dispatcher that
counts on that, but it's a just-so story and a hard case. Hard cases
make bad law. If it really matters, we can provide better reflection
facilities, but I'm pretty sure it doesn't occur enough to justify doing
so now.
So use the toString hack if you must and let's see if this use-case
becomes hot.
Also IMO arrow functions should not have `arguments` at all.
That's already in the proposal:
http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax
"The /Identifier/ primary expression |arguments| may not be used in an
arrow function’s body (whether expression or block form)."
/be
Regards
--
Irakli Gozalishvili
Web: http://www.jeditoolkit.com/
On Monday, 2012-06-11 at 11:04 , Allen Wirfs-Brock wrote:
On Jun 11, 2012, at 10:56 AM, Irakli Gozalishvili wrote:
I don't think any library should ever rely on f.length.
That's a wrong attitude, there always will be legitimate uses of
any feature, otherwise such features are just harmful & IMO should
be deprecated / removed.
Let me try again. We don't understand your use case. You didn't
show us the definition of your dispatch function so we have to guess.
Even so, It is hard to imagine a "legitimate" use with dynamically
provided functions, particularly as the length values assigned to the
existing built-ins don't follow strict rules. At the very least you
need to help us understand why your use case is both reasonable and
valid.
Allen
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