Reduce context parameter

Rick Waldron waldron.rick at gmail.com
Mon Jan 7 14:59:54 PST 2013


On Monday, January 7, 2013, Andrea Giammarchi wrote:

> Rick you know bind is that slow and it costs on GC if used massively ;-)
>

This is not my problem, implementors should optimize. bind() would only
occur once per method call.


>
> I use a lot the second argument in Array#extras and I feel Peter van der
> Zee here: reduce/Right should have had that too
>

The initialVal argument is _optional_ and undefined is valid — how would
you decide if what was passed should be initial value or thisArg?

Rick





>
> br
>



>
>
> On Mon, Jan 7, 2013 at 1:10 PM, Rick Waldron <waldron.rick at gmail.com<javascript:_e({}, 'cvml', 'waldron.rick at gmail.com');>
> > wrote:
>
>> I know this doesn't answer your question, but Function.prototype.bind
>> makes thisArg obsolete.
>>
>> Regarding the origin story, there is some discussion here:
>> https://mail.mozilla.org/pipermail/es-discuss/2008-June/006431.html
>>
>> Rick
>>
>>
>> On Mon, Jan 7, 2013 at 3:56 PM, Andrea Giammarchi <
>> andrea.giammarchi at gmail.com <javascript:_e({}, 'cvml',
>> 'andrea.giammarchi at gmail.com');>> wrote:
>>
>>> I think to increase confusion with other Array#extras :D
>>>
>>> and since we have this specced as it is now, a third parameter for the
>>> context could add even more confusion later on <3
>>>
>>> I know, I should not have answered that ...
>>>
>>>
>>> On Sun, Jan 6, 2013 at 9:48 AM, Peter van der Zee <ecma at qfox.nl<javascript:_e({}, 'cvml', 'ecma at qfox.nl');>
>>> > wrote:
>>>
>>>> Mostly out of curiosity; why do Array#reduce and reduceRight have no
>>>> context parameter?
>>>>
>>>> - peter
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>>>
>>>
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>>
>
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