On Thu, Dec 19, 2013 at 4:37 AM, Allen Wirfs-Brock <allen at wirfs-brock.com>wrote:

>
> On Dec 18, 2013, at 11:01 AM, Shijun He wrote:
>
> > ...
> >
> > 2)
> > In fact such expressive is MEANINGLESS because we will never write `var
> a = Array.of(1, 2, 3)` instead of `var a = [1, 2, 3]`
> >
>
> Note that  'of' works to create instances of subclasses or Array (and
> typed arrays) while array literals do not.
>
> class MyArray extends Array { }
>
> var ma = MyArray.of(1,2,3);
>
> console.log(ma instanceof MyArray);  //true
>
> allen
>

var ma = new MyArray(1, 2, 3)        still work.

If we want to avoid the constructor, we can :

var ma = MyArray.from([1, 2, 3])

or just fix the constructor --- if the behavior of default constructor is
confusing why not fix it? For the built-in Array we can not, but you
already extend it here!

class MyArray extends Array {
  constructor(...a) { this.push(...a) }
}




So  I still think only high-order usage for built-in Array is a real use
case.
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On Thu, Dec 19, 2013 at 4:37 AM, Allen Wirfs-Brock <allen at wirfs-brock.com>wrote:

> Note that  'of' works to create instances of subclasses or Array (and
> typed arrays) while array literals do not.

```js
var ma = new MyArray(1, 2, 3)
```

still work.

If we want to avoid the constructor, we can :

```js
var ma = MyArray.from([1, 2, 3])
```

or just fix the constructor --- if the behavior of default constructor is
confusing why not fix it? For the built-in Array we can not, but you
already extend it here!

```js
class MyArray extends Array {
  constructor(...a) { this.push(...a) }
}
```




So  I still think only high-order usage for built-in `Array` is a real use
case.