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#6132 closed enhancement (wontfix)

Opened February 20, 2010 04:22PM UTC

Closed November 19, 2010 11:10AM UTC

jQuery.each includes prototype functions

Reported by: agoebel Owned by:
Priority: undecided Milestone: 1.4.2
Component: core Version: 1.4.1
Keywords: each, object, prototype Cc:
Blocked by: Blocking:

I'm not entirely sure if this is deliberate or not, but the way jQuery handles the each method includes anything defined in the prototype.


Object.prototype.newMethod = function() {};
var keys = [],
    map = {
        'a': 1,
        'b': 2,
        'c': 3

jQuery.each( map, function(k,v) {

the keys array has a value of:


The change is pretty trivial. Simply add a hasOwnProperty filter to the object portion of the each method.

//starting from line 556
if ( isObj ) {
    for ( name in object ) {
        if ( !object.hasOwnProperty(name) ) {
        if ( callback.apply( object[ name ], args ) === false ) {

Using this code, keys is:


Which I personally think is what it should be. As an alternative, maybe a flag can be introduced to determine whether or not prototype values are filtered out.

The modified jquery-1.4.2 file is attached. I tested the example and patched code in firefox 3.6, chrome 4.0, and IE8.

Attachments (1)
  • jquery-1.4.2.modified.js (160.1 KB) - added by agoebel February 20, 2010 04:40PM UTC.

    jQuery 1.4.2 with $.each modified to exclude prototype/inherited values of an object

Change History (1)

Changed November 19, 2010 11:10AM UTC by snover comment:1

priority: → undecided
resolution: → wontfix
status: newclosed

A user can use hasOwnProperty to filter out anything from the prototype that they want to already; this patch only limits the ability for users to decide whether or not they want to access prototype members too.