Array.prototype.toObjectByProperty( element=> )

Naveen Chawla naveen.chwl at
Wed Aug 9 07:51:18 UTC 2017

The `toObject` behaviour doesn't need to be "implemented" on a per-iterable
class basis. It has a constant behaviour: iterate and on each next(), pass
the value to the `toKeyFromElement` and `toValueFromElement` callbacks to
generate and return an object. There must be some construct by which that
can be achieved. I wouldn't call it "better" to put it on Object (for the
reasons stated), but rather a compromise in the absence of any such

On Wed, 9 Aug 2017 at 13:12 T.J. Crowder <tj.crowder at>

> On Wed, Aug 9, 2017 at 8:35 AM, Naveen Chawla <naveen.chwl at>
> wrote:
> >
> > It would be in the `iteratable` `protocol` (interface)
> As Jordan said, that's likely to be a nonstarter. The Iterable protocol is
> *very* lean (exactly one required property) for a reason: So it can be
> supported with minimum investment. Much better, IMHO, to put functions on
> `Object` and `Map` (which is why that's what I suggested).
> -- T.J. Crowder
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