Nov 16 meeting notes

Dean Landolt dean at deanlandolt.com
Wed Nov 23 11:10:06 PST 2011


On Wed, Nov 23, 2011 at 1:29 PM, Dean Landolt <dean at deanlandolt.com> wrote:

>
>
> On Wed, Nov 23, 2011 at 1:17 PM, David Herman <dherman at mozilla.com> wrote:
>
>> On Nov 18, 2011, at 2:00 AM, Peter van der Zee wrote:
>>
>> > On Thu, Nov 17, 2011 at 10:02 PM, Brendan Eich <brendan at mozilla.com>
>> wrote:
>> >> On Nov 17, 2011, at 11:26 AM, Dean Landolt wrote:
>> >>
>> >>> Who can resist such a juicy bikeshed...
>> >
>> > Please keep the general js api consistent.
>>
>> A foolish consistency...
>>
>> We also use 'hasOwnProperty' and 'forEach' and 'toLocaleString' in JS.
>> Why not use those names? Because it's not the same operation. Neither is it
>> the same thing as .length. An array is a sequential data structure, so it
>> uses .length. A map and a set is not a sequential data structure, so it
>> should not.
>>
>
>
> As a thought experiment imagine someone were to propose
> Object.prototype.length -- what exactly would you expect that to mean? How
> would this be any different than Map.prototype.length? It'd be just as
> nonsensical. I could see `keyLength` being here, and something like
> `itemLength` being logical for sets, but these two concepts really are the
> same. It could also be said that a set's `itemLength` is the same concept
> as an array's.
>
> This merits a new property, delegating the length property where it makes
> sense (sequences). IMHO the `count` property captures this intension
> nicely. Something like this, perhaps:
>
> Object.prototype.count => total keys
> Map.prototype.count => total keys
> Set.prototype.count => total items
> Array.prototype.length => length
> Array.prototype.count => Array.prototype.length (sans holes?)
> String.prototype.length => length
> String.prototype.count => String.prototype.length
>

Hmm...more consistent would be for Array.prototype.count to skip holes
*and* add
in the count of non-integer keys. This would be a very handy addition to
the standard lib -- IIUC there's no efficient way to do this now.

Would it be asking too much for String.prototype.count to return total
unicode characters? :P
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