How to get numeric index of the equivalent key in associative array in javascript

Question

var assoArray={
    "Test": 0,
    "Test 2": 2
}

In the above associative array, i could get value of Test2 by

var valofTest2 = assoArray["Test 2"]

how do i get the equivalent numeric index of "Test 2" ? would expect 1 as an output

PS: am new to JS

Answer 1

There isn't one.

Before the latest specification updates (ES6), the order of keys in an object was entirely undefined and could return in a different order every time.

With ES6, the order is defined as the order they were added in, so you can get close with something like Object.keys(foo) .indexOf('Test 2') . It will give you the index in the array of keys, which should be stable for the life of the object and property.

Answer 2

function indexOfAtrr(obj,attr) {
    i = 0;
    $.each(obj, function(key, value) {
        if (key == attr) return i;
        i++;
    });
    return -1;
}