I might be missing something, but how for-of help solving parametrized
enumeration (that is, specifying an action applied on a value/key in a
functional style)?
I see clear use-case of Object.values(...) in addition to Object.keys(...), and
it has nothing to do with for/of enumeration.
Why refuse a convenient library method and force users to 1) let values = [];
2) for (v of values(o)) { values.push(v); }, if it can be just let values =
Object.values(o);?
Why refuse a _parametrized_ functional iteration such as Object.forEach(o,
parametrizedAction) and force users to write different static for-of loops with
own loop body per each condition, if this condition can be passed as a function?
P.S.: for consistency with [].forEach, it probably would make sense having
{}.forEach, but it's O.prototype pollution.
Dmitry
On Jun 7, 2013, at 10:18 AM, Dean Landolt wrote:
> The for/of iterators solve this nicely. This is definitely something that
> comes up a lot though, and this seems like a very handy cowpath to pave. If
> it were spec'd I'd suggest the naming and argument values should align with
> the for/of variants.
>
>
> On Fri, Jun 7, 2013 at 12:57 PM, Andrea Giammarchi
> <andrea.giammar...@gmail.com> wrote:
> it comes out from time to time devs would like to have `Object.values()` as
> equivalent of `Object.keys()` except the returned array would contain values.
>
> Better than repeated
> `Object.keys(obj).map(function(p){return this[k];}, obj);`
> all over
>
> but probably less useful than a more generic `Object.forEach(obj, callback,
> thisValue)` where `callback` would receive `(value, key, originalObject)` and
> `thisValue` as context.
>
> This is consistent with `Array#forEach` and could simplify `for/in` loops
> passing over own enumerable properties only, as keys would do.
>
> Thoughts ?
>
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