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
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