Ignoring arguments

Caitlin Potter caitpotter88 at gmail.com
Sun May 29 17:40:22 UTC 2016


It is.

https://tc39.github.io/ecma262/#prod-FunctionRestParameter

https://tc39.github.io/ecma262/#prod-BindingRestElement

> On May 29, 2016, at 1:36 PM, Renki Ivanko <fatalis.erratum at gmail.com> wrote:
> 
> It works in V8 at least, so I assumed it's correct.
> 
>> On Sun, May 29, 2016 at 8:29 PM, Bob Myers <rtm at gol.com> wrote:
>> I'm quite sure this syntax is invalid.
>> 
>> 
>>> On Sun, May 29, 2016 at 9:36 PM, Renki Ivanko <fatalis.erratum at gmail.com> wrote:
>>> You can already do it like this:
>>> 
>>> ```js
>>> ((...[,,foo]) => foo)(1, 2, 3) // -> 3
>>> ```
>>> 
>>> 
>>> R. <http://untu.ms/>
>>> 
>>>> On Sun, May 29, 2016 at 6:53 PM, Cyril Auburtin <cyril.auburtin at gmail.com> wrote:
>>>> Similarly to:
>>>> 
>>>> `var [,x,,y] = [1,2,3,4,5,6];`
>>>> 
>>>> I think it could be interesting to let a field empty in function arguments
>>>> 
>>>> `[1,2,3,4].map( (,i) => i )`, `Array.from({length:10}, (,i) => i )`
>>>> 
>>>> `function test(a,,b) { }`
>>>> 
>>>> (but that would alter the current parsing, that doesn't allow it)
>>>> 
>>>> Currently I often use `_` as a way to mark ignored fields, but when there are more than 1 you need another identifier. A standard way would be interesting rather
> 
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