Is the order of elements in a JSON list preserved?

Question

I\'ve noticed the order of elements in a JSON object not being the original order.

What about the elements of JSON lists? Is their order maintained?

Answer 1

Practically speaking, if the keys were of type NaN, the browser will not change the order.

The following script will output "One", "Two", "Three":

var foo={"3":"Three", "1":"One", "2":"Two"};
for(bar in foo) {
    alert(foo[bar]);
}

Whereas the following script will output "Three", "One", "Two":

var foo={"@3":"Three", "@1":"One", "@2":"Two"};
for(bar in foo) {
    alert(foo[bar]);
}