Array.prototype.toObjectByProperty( element=> )

Jordan Harband ljharb at
Wed Aug 9 07:31:06 UTC 2017

An iterator is just an object with a `next` method. There's no consistent
place to put any prototype methods on all iterables, so that's a nonstarter

On Wed, Aug 9, 2017 at 12:26 AM, Naveen Chawla <naveen.chwl at>

> I do not use entries so I would not use `Object.fromEntries`. For arrays I
> could just use reduce, instead of transforming to [key, value] entries,
> before factoring it into an `arrayToObject` function in my code (which I
> already do) when I want to do it from more than one place in my code - if
> there existed no more direct way of transforming from iterable to object.
> All entries arrays are iterable, but not all iterables are entries arrays,
> which means that iterable is the more generic concept than entries, meaning
> that iterable, not entries, is the more suitable starting point for this
> functionality.
> `Object.fromIterable(iterable, keyFromElement[, valueFromElement])` is
> more verbose than `iterable.toObject(keyFromElement[, valueFromElement])
> and doesn't allow chaining after iterable transformation methods (like
> `filter` etc.)
> On Tue, 8 Aug 2017 at 16:23 Naveen Chawla <naveen.chwl at> wrote:
>> OK thanks for the link - can you explain where the complexity is in my
>> proposal?
>> On Tue, 8 Aug 2017 at 16:14 T.J. Crowder <tj.crowder at>
>> wrote:
>>> On Tue, Aug 8, 2017 at 11:39 AM, Naveen Chawla <naveen.chwl at>
>>> wrote:
>>> > Furthermore, if you use entries, this allows `[key, value]` entries
>>> > with object keys to be transformed into objects (which is not
>>> > allowed by `Object.fromEntries`):
>>> With respect, please do have a *thorough* read of my first reply in this
>>> thread, the ensuing discussion with Darien, and Darien's proposal, in
>>> particular [this bit of it](
>>> object-from-entries#additional-arguments). Those various sources
>>> explain my comment about complexity and how `Object.fromEntries` might do
>>> what you want.
>>> -- T.J. Crowder
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