$.each, $.extend, etc. should take care of JScript DontEnum bug

[timmolendijk]

See ​https://developer.mozilla.org/en/ECMAScript_DontEnum_attribute#JScript_DontEnum_Bug

Take this code:

$.each({a: 1, toString: 'x'}, function(k, v) {
  console.log(k);
});

This should log:

a
toString

This works in all browsers expect IE (I tested in version 8), in which it logs:

a

[dmethvin]

The page referenced does not provide any workaround that I could find. If you know of one, reopen the ticket and we will consider it.

[Rick Waldron]

I know Prototype.js does this, but I think their implementation suffers performance.

​http://s3.amazonaws.com/activereload-lighthouse/assets/5706c4afb052c34b73bc2b73a222ba510bea376d/0001-Alternative-Object.keys-Object.values-fix-for-IE.patch?AWSAccessKeyId=1AJ9W2TX1B2Z7C2KYB82&Expires=1289446282&Signature=xuDykt9Cp7mNkyOrwFbFej4iPMc%3D

[dmethvin]

I think you meant to link to this:

​https://prototype.lighthouseapp.com/projects/8886/tickets/23-object-keys-object-values-dontenum-ie-fix

[Rick Waldron]

Yikes! that was the link to the patch file. Thanks Dave.

[timmolendijk]

Yep I'm currently successfully using a similar work-around.

[snover]

#5523 is a duplicate of this ticket.

[asmecher]

This affects JQuery's extend function in that it will sometimes enumerate "prototype" in the copy loop. With my FireFox 3.5.15, the JS example at ​http://jsfiddle.net/hBbJg/ will show a pop-up (thus buggy enumeration behavior). The "for ( name in options )" loop in "extend" falls prey to the same problem.

[timmolendijk]

Discussion on the same topic at Underscore.js: ​https://github.com/documentcloud/underscore/issues/issue/60