I believe, though, that these proposed solutions will be equally deemed by
the OP's company as "too much work"... otherwise they would just fix their
for..in loops to not be for..in loops, right?
On 3/27/08, RobG <[EMAIL PROTECTED]> wrote:
>
>
>
>
> On Mar 28, 11:32 am, kangax <[EMAIL PROTECTED]> wrote:
> > Isn't hasOwnProperty missing in Safari < 2.0.2 ?
>
>
> Apparently, propertyIsEnumerable is an alternative but I think it's
> missing from those versions too.
>
> I probably should also mention that the only robust way to use for..in
> is to implement object creation using a scheme where you know exactly
> the propreties to include or ignore. You might like to try this one
> in Firefox and IE:
>
> var t = {};
> alert(
> t.hasOwnProperty('__proto__') + '\n' +
> t.hasOwnProperty('__parent__') + '\n' +
> '');
>
> Perahps an alternative is to see if the property exists in an
> unextended $A:
>
> var testArray = $A();
>
> for (var p in obj) {
>
> if (!(p in testArray)) {
> // p is not a property of $A
> }
> }
>
> Another strategy is to modify Prototype.js so that all methods added
> to Array.prototype also have a dontEnum property added that is set to
> true, something like:
>
> Object.extend(Array.prototype, {
> _each: function(iterator) {
> ...
> },
> ...
> toJSON: function() {
> ...
> }
> });
>
> for (var p in Array.prototype) {
> Array.prototype[p].dontEnum = true;
> }
>
> Which assumes all the additions are objects, which seems OK, and
> then...
>
>
> for (var p in obj) {
>
> if (!obj[p].dontEnum) {
> ...
> }
> }
>
> Noting that you can't actually make any property DontEnum using native
> code. The last approach is untested, feel free to criticise.
>
>
>
> --
> Rob
> >
>
--
Ryan Gahl
Manager, Senior Software Engineer
Nth Penguin, LLC
http://www.nthpenguin.com
--
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--
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