Array.prototype.contains

Rick Waldron waldron.rick at gmail.com
Wed Jul 23 09:43:10 PDT 2014


Array.prototype.contains has been approved for the ES7 process:
https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-04/apr-9.md#45-arrayprototypecontains

Rick


On Wed, Jul 23, 2014 at 12:41 PM, Will Ray <wray167 at gmail.com> wrote:

> Additionally, .contains() can be used in a conditional statement directly,
> while .indexOf() requires the result of a comparison with -1 (or a bitwise
> inversion, which is not terribly intuitive). It's just more room for simple
> typos.
>
> Will Ray
>
>
> On Wed, Jul 23, 2014 at 5:29 AM, Maël Nison <nison.mael at gmail.com> wrote:
>
>> Isn't replacing DOMStringList a different issue than adding
>> Array.prototype.contains ?
>>
>> Using indexOf is possible, but a .contains() method would give a stronger
>> notice of intent when reading code.
>>
>>
>> On 7 March 2014 15:11, Boris Zbarsky <bzbarsky at mit.edu> wrote:
>>
>>> On 3/6/14 6:15 PM, Joshua Bell wrote:
>>>
>>>> FWIW, Blink uses DOMStringList only in IndexedDB and apparently in
>>>> Location.ancestorOrigins
>>>>
>>>
>>> Indeed.  And Location.ancestorOrigins is fairly new and not broadly
>>> implemented, so I don't expect its behavior to be a strong compat
>>> constraint.
>>>
>>> So I guess that leaves us with a few questions:
>>>
>>> 1)  Is it still early enough in the indexeddb world that we can change
>>> the thing it uses from DOMStringList to Array.  And if so whether that's a
>>> change we want to make.
>>>
>>> 2)  If we want to keep the non-writing behavior for indexeddb or for
>>> some other reason (insufficiently flexible bindings systems?) can't switch
>>> ti to Array for now, can we just remove item() and contains() from
>>> DOMStringList to make the switch easier later?
>>>
>>>
>>> -Boris
>>> _______________________________________________
>>> es-discuss mailing list
>>> es-discuss at mozilla.org
>>> https://mail.mozilla.org/listinfo/es-discuss
>>>
>>
>>
>>
>> --
>> Maël Nison (arcanis <https://twitter.com/arcanis>)
>> Frontend Developer @ Sketchfab
>>
>>
>>
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>> https://mail.mozilla.org/listinfo/es-discuss
>>
>>
>
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