if i have a literal object with length attribute, the each() function cannot work well as what i want. For example:

var objWithLength = {
    length: 2,
    a: 1
};
jQuery.each(objWithLength, function(key, value){
    alert(key + ': ' + value);
});

the each() function will alert out !''1: undefined!'' and !''2: undefined!''.

i read the source of jQuery, the each(obj, ...) function only checks 'obj.length' attribute and isFunction(obj). Do you do this for purpose?

if i have the honor, i hope you can sent me an reply.

thank you!

This may get marked wontfix, but there is still a ''little'' bit of wiggle room here.

https://github.com/jquery/jquery/pull/1064

Fixes #13021. Normalization of core utility array like detection based on standard protocol by Richard Gibson <richard.gibson@gmail.com>. Closes gh-1064

Changeset: 07a7b3e4cf961e51bddcdb90cdca34f9126ed286

$.each($("ul#prod_nav li"), function (key, data) {

console.log(key)

})

Not working, please help me with correct code for latest Jquery 2.x

Replying to [comment:4 anonymous]:

$.each($("ul#prod_nav li"), function (key, data) { console.log(key) }) Not working, please help me with correct code for latest Jquery 2.x

May be you have something wrong in you code. i had tried this similarly by my own, and it worked well. if you still cannot checkout the problem, you can send your code to me with email zengweiqun@yeah.net. and i would like to do my best to help you. any way, thanks for your attention!

This bug is not exactly fixed. There are still some cases that make each function do not work well. For example:

// If the object.length == 0
var objWithLength = {
    length: 0,
    a: 1
};
// use each on objWithLength
$.each(objWithLength, function(key, value){
    console.log(value);
})

There is nothing to be console.log(ged) out.

Another example:

// If the object.length != 0
var objWithLength = {
    length: 2,
    "1": 1,
    "2": 2
};
// use each on objWithLength
$.each(objWithLength, function(key, value){
    console.log(value);
})

There are something logged out. But the result is not what I want. Under jQuery 1.11.2 version, the logged result is:

undefined
1

I have check the jQuery source, there is a isArraylike function used to check whether it should use for...in or for to iterate the object:

function isArraylike( obj ) {
    // Support: iOS 8.2 (not reproducible in simulator)
    //  check used to prevent JIT error (gh-2145)
    // hasOwn isn't used here due to false negatives
    // regarding Nodelist length in IE
    var length = "length" in obj && obj.length,
        type = jQuery.type( obj );
    if ( type === "function" || jQuery.isWindow( obj ) ) {
        return false;
    }
    if ( obj.nodeType === 1 && length ) {
        return true;
    }
    return type === "array" || length === 0 ||
        typeof length === "number" && length > 0 && ( length - 1 ) in obj;
}

In fact, there is no good method to check whether an object is arraylike or not. My question is:

why check "length === 0" and "typeof length === "number" && length > 0 && ( length - 1 ) in obj"?