@@iterator in arguments object

Rick Waldron waldron.rick at gmail.com
Sun Dec 23 18:35:18 PST 2012


On Sun, Dec 23, 2012 at 9:25 PM, Brandon Benvie
<brandon at brandonbenvie.com>wrote:

> Because initialValue can be a provided `undefined` in which case you would
> use that, as opposed to a missing value. The specification differentiates
> between a provided undefined and a lack of a parameter in a bunch of stdlib
> functions/methods.
>

True enough: "is present", used in reduce, reduceRight, Object.create and
then elsewhere in the abstract internals and then in different contexts.

Rick
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