But, can
```js
let a = [1,2,3]
```
create a new MyArray? Maybe, instead of having negative indices by
default (which breaks some backwards compatibility) we can introduce a
symbol for overriding property access? Something like
```js
Array.prototype[Symbol.propertyAccess] = function(index) {
if (index < 0) ...
else ...
}
```
? Just an idea; I'm not sure if that's a good use for Symbols. We
could then easily add this helper code to a given app.
On Mon, Apr 18, 2016 at 10:25 AM, kdex <[email protected]> wrote:
> I don't see a good reason why to mangle with this.
> Note that you can achieve this behavior without breaking backwards
> compatibility with ES6 Proxies:
>
> ```js
> class MyArray extends Array {
> constructor(...args) {
> super(...args);
> function computeProperty(target, property) {
> const index = +property;
> return index < 0 ? String(target.length + index) :
> property;
> }
> return new Proxy(this, {
> get(target, property, receiver) {
> return Reflect.get(target,
> computeProperty(target, property), receiver);
> },
> set(target, property, receiver) {
> return Reflect.set(target,
> computeProperty(target, property), receiver);
> }
> });
> }
> }
> ```
>
> On Montag, 18. April 2016 09:59:15 CEST /#!/JoePea wrote:
>> Backwards compatibility has been broken before. I don't think this one
>> is too bad of a breakage.
>>
>> On Sun, Apr 17, 2016 at 9:48 PM, Biju <[email protected]> wrote:
>> > On 17 April 2016 at 17:29, Frankie Bagnardi <[email protected]> wrote:
>> >> That would break backward compatibility;
>> >>
>> >> ```js
>> >> var a = ['a'];
>> >> a['-1'] = 'test';
>> >> Object.keys(a) // ['0', '-1']
>> >> ```
>> >
>> > Do we have statistics how many sties depend on that?
>> > _______________________________________________
>> > es-discuss mailing list
>> > [email protected]
>> > https://mail.mozilla.org/listinfo/es-discuss
>> _______________________________________________
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>>
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