Ehr ... for stringified version ...
getNativeConstructor = function(toString, RegExp){return function(Object){
return toString.call(Object).replace(RegExp, "$1");
}}(Object.prototype.toString, /^.{8}([^\]]+)\]$/);
:-)
On Thu, Oct 9, 2008 at 11:28 PM, Andrea Giammarchi <
[EMAIL PROTECTED]> wrote:
> I like the trick, specially because it makes easily "flat" values like
> "false" and "new Boolean(false)", as example, and I guess a function like
> this one could be useful as well, isn't it?
>
> getNativeConstructor = function(toString, RegExp){return function(Object){
> return window[toString.call(Object).replace(RegExp, "$1")];
> }}(Object.prototype.toString, /^.{8}([^\]]+)\]$/);
>
> I am not sure about the window trick, maybe a string is enough for switches
> and other checks
>
> getNativeConstructor = function(toString, RegExp){return function(Object){
> return window[toString.call(Object).replace(RegExp, "$1")];
> }}(Object.prototype.toString, /^.{8}([^\]]+)\]$/);
>
> switch(getNativeConstructor(whatever)){
> case "Array": ...
> case "Boolean": ...
> case "Number": ...
> }
>
> Regards
>
>
> On Thu, Oct 9, 2008 at 7:33 PM, Nathan Hammond <[EMAIL PROTECTED]>wrote:
>
>>
>> This showed up on Douglas Crockford's blog today:
>> Object.prototype.toString.apply(value) === '[object Array]'
>>
>> The trick appears to have been in circulation for about 6 months and
>> shows up in DWR as well as DC's book. DC credits Mark Miller for it.
>> Probably slower than the value.constructor == Array test we use
>> everywhere, but fixes the iframe-created object issue.
>>
>> 1. Should we adopt it for resiliency?
>> 2. @Michael Geary: Are you using this in your iframe sandbox code? It
>> sure would beat the heck out of duck typing.
>>
>> Just starting a discussion...
>> Nathan
>> >>
>>
>
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