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Re: ECMAScript and chaining

From: Mark S. Miller <erights@google.com>
Date: Thu, 22 Nov 2012 11:52:11 -0800
Message-ID: <CABHxS9h2pRjTpHgvL8WtEfTxHdgg-Ejxbc7XjhajPLZZ1=0L5Q@mail.gmail.com>
To: Rick Waldron <waldron.rick@gmail.com>
Cc: Anne van Kesteren <annevk@annevk.nl>, "public-script-coord@w3.org" <public-script-coord@w3.org>
On Wed, Nov 21, 2012 at 6:31 PM, Rick Waldron <waldron.rick@gmail.com> wrote:
> On Wed, Nov 21, 2012 at 5:26 PM, Anne van Kesteren <annevk@annevk.nl> wrote:
>>
>> Hi,
>>
>> I was wondering if the plan of TC39 is to start returning the object
>> on which a method was invoked if that method would otherwise just
>> return undefined.

No, though Rick just placed this on the agenda to discuss at the
upcoming meeting.

>> E.g. this seems to be what Object.freeze() and
>> Object.preventExtensions() do. It's also a somewhat popular API idiom
>> in jQuery and the like (see also method chaining, fluent interface).
>
>
> I'm not sure what you mean by "start"—this is already the prevailing
> practice.

It is most definitely not. Let's discuss more at the upcoming meeting.


> APIs either return an expected specified value/object, the target
> object (in the case of static built-ins, eg. Object.freeze(o); // o ) or a
> new specified object (eg. Array.prototype.{ filter, map } etc.).
>
>
>>
>>
>> (The reason I'm asking is that I just WONTFIXED two bugs asking for
>> that stating that ECMAScript did not have this pattern either and I
>> was confronted with the above.

Good, thanks.


>
>
> Links?
>
>>
>> I had been looking at Map.set()
>> myself.)
>
>
> The ES6 Map, Set and WeakMap API specifications are still in development and
> probably shouldn't be used to make decisions like this.
>
> In this particular case there is no rationale documented for these not
> returning the object they are called from, so it's still open for
> discussion, ie. Map.prototype.set, Set.prototype.add and
> WeakMap.prototype.set.
>
> Rick
>
>
>>
>>
>> Cheers,
>>
>>
>> --
>> http://annevankesteren.nl/
>>
>



--
    Cheers,
    --MarkM
Received on Thursday, 22 November 2012 19:52:38 UTC

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