Array.prototype.contains

Erik Arvidsson erik.arvidsson at gmail.com
Fri Nov 2 08:19:31 PDT 2012


I'll put up a proposal once electricity is back. I'll use the same
comparison as done in maps.
On Nov 2, 2012 2:03 AM, "Allen Wirfs-Brock" <allen at wirfs-brock.com> wrote:

>
> On Nov 1, 2012, at 11:04 AM, Joshua Bell wrote:
>
> Bump.
>
> I don't think Array.prototype.contains ever materialized on the
> "proposals" page, and hasn't shown up in an ES6 draft.
>
> Officially out for ES6, stuck in the queue, or dropped on the floor?
>
>
> Probably dropped on the floor, unless somebody can find something about it
> in meeting notes.
>
> It looks to me from scanning just this thread that it was an idea that was
> floated here with generally positive responses, but had some unresolved
> issues, and nobody ever signed on as champion to write an actual proposal.
>
> Allen
>
>
>
>
>
>
>
>
> On Fri, Feb 24, 2012 at 4:40 PM, Rick Waldron <waldron.rick at gmail.com>wrote:
>
>> Allen, thank you for the clarification there
>>
>>
>> Rick
>>
>>
>> On Feb 24, 2012, at 7:19 PM, Allen Wirfs-Brock <allen at wirfs-brock.com>
>> wrote:
>>
>>
>> On Feb 24, 2012, at 11:09 AM, Rick Waldron wrote:
>>
>>
>>
>> On Thu, Feb 23, 2012 at 3:15 PM, Erik Arvidsson <erik.arvidsson at gmail.com
>> > wrote:
>>
>>> DOM4 added a new interface called DOMStringList for the sole reason
>>> that Array does not have contains. Before this the return type was an
>>> Array of Strings so we could use indexOf, map, forEach etc. Now that
>>> it is using a non Array we lost all of that.
>>>
>>
>> Wouldn't the return type (or [[Class]]) still be restricted from using
>> "Array"?
>>
>> From 8.6.2
>>
>> The value of the [[Class]] internal property is defined by this
>> specification for every kind of built-in object. The value of the [[Class]]
>> internal property of a host object may be any String value except one of
>> "Arguments", "Array", "Boolean", "Date", "Error", "Function", "JSON",
>> "Math", "Number", "Object", "RegExp", and "String".
>>
>>
>> So it can't be an "Array" by name, right?
>>
>>
>> It can be, as long as it really is a ES array.  "host object" doesn't
>> mean any object created by the host.  It means new kinds of objects created
>> by the host that implement primitive behaviors (generally internal methods)
>> differently from what is specified by the ES spec.
>>
>> So, from the ES perspective, no problem.  When I originally asked the
>> question I was thinking more about from the Web IDL perspective.  Does Web
>> IDL require things (for example throwing if extra arguments are passed)
>> that ES Arrays do not do.
>>
>>
>> Allen
>>
>>
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>>
>>
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