Ignoring arguments

Bob Myers rtm at gol.com
Sun May 29 17:46:36 UTC 2016


Eliding array elements is not "similar" to eliding function formal
parameters. The latter is extremely rare, hardly readable, confusing,
bug-prone, and unnecessary because there is already a "standard way" which
is to use any old parameter name you want:

```js
function foo(UNUSED1, UNUSED2, x)
````

Most linters will not complain, or there are ways to shut them up if they
do.

If you want to throw away an argument, just throw it away.

```js
function skipFirstParam(fn) { return ((first, ...args) => fn(...args)); }

`[1,2,3,4].map(skipFirstParam(i => i));

```

Or use Renki's solution.

Bob


On Sun, May 29, 2016 at 9:23 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
>
> _______________________________________________
> es-discuss mailing list
> es-discuss at mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
>
>
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