On Apr 13, 2012, at 11:22 AM, David Herman wrote:
> On Apr 13, 2012, at 10:53 AM, Allen Wirfs-Brock wrote:
>
>> On Apr 13, 2012, at 10:10 AM, Brendan Eich wrote:
>>
>>> In general, delegation (depth D) plus optionality (degree N paramters)
>>> makes an (2N)^D worst-case combinatorial explosion.
>>>
>>> This is IMHO a strong argument for a sentinel in-language to mean "missing
>>> actual".
>>
>> That sentinel could simply be a empty argument position:
>>
>> new Intl.Collator( , {usage: "search"});
>
> That's not enough. It doesn't allow you to make a dynamic decision as to
> whether or not to pass that argument, which still leaves you in general with
> the combinatorial explosion.
sure you can
Intl.Collator = function(...args) {
let [locale=defaultLocale, options={}] = args;
let localeDefaulted = args.hasOwnProperty("0")
...
}
>
> I'm very much in favor of defaults treating undefined exactly the same as no
> argument.
>
> Dave
>
>
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