however, push does invoke [[Put]] but only in non array objects.
var a = {};
Object.defineProperty(
a, "0",
{ get : function() { alert('get 0'); return this.zero; },
set : function(v) { alert('set 0 ' + v); this.zero = v; },
enumerable : true,
configurable : false });
a.length = 0;
a.push = [].push;
alert('before push a[0] = ' + a[0]);
a.push(44);
alert('after push a[0] = ' + a[0]);
On Mon, Oct 24, 2011 at 4:12 PM, Andrea Giammarchi <
[email protected]> wrote:
> In webkit nightly not even the getter gets invoked.
>
> On Tue, Oct 18, 2011 at 9:31 PM, felix <[email protected]> wrote:
>
>> If I define a setter for Array.prototype[0], does [].push invoke that
>> setter?
>>
>> Test code:
>>
>> <!doctype html><html><body>
>> <script>
>> Object.defineProperty(
>> Array.prototype, 0,
>> { get : function() { alert('get 0'); return this.zero; },
>> set : function(v) { alert('set 0 ' + v); this.zero = v; },
>> enumerable : true,
>> configurable : false });
>> var a = [];
>> alert('before push a[0] = ' + a[0]);
>> a.push(44);
>> alert('after push a[0] = ' + a[0]);
>> </script>
>> </body></html>
>>
>> On all the browsers I've tried so far, the setter doesn't get invoked.
>>
>> However, it looks to me like the ES5.1 spec says the setter should get
>> invoked:
>>
>> 15.4.4.7 says push() invokes the [[Put]] internal method
>>
>> 8.12.5 says [[Put]] tries to use an inherited property descriptor if
>> there isn't an own property descriptor.
>> _______________________________________________
>> es-discuss mailing list
>> [email protected]
>> https://mail.mozilla.org/listinfo/es-discuss
>>
>
>
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