Opera .getJSON returns reordered results

[pavelkunc]

You can check it live: ​http://pavel.fry-it.com/operabug/index.htm

Problem

I put simple JSON string in the /scale.js: {"54":"a","56":"b","6":"c","5":"d"}

I parse this JSON string with getJSON jQuery (jQuery is from trunk) method and just append results to the results paragraph with this code: $(document).ready(function() {

$.getJSON('scale.js', function(json){

for(var i in json) {

$('#results').append(i + ' -> ' + json[i] + "

");

}

});

});

If you run this with Firefox 2.0.0.3 (I have) you will see that values in results are in alphabetic order (and should be because that's order in JSON), but if your open this in Opera 9.10 you will see that the order is wrong, because results are ordered by key numericaly.

What's wrong?

Results (opera)

5 -> d 6 -> c 54 -> a 56 -> b

Results (Firefox)

54 -> a 56 -> b 6 -> c 5 -> d

[john]

That's correct. The ordering of properties within an object are not guaranteed (as you can see by the Opera results). There is no way to preserve, or enforce, a specific ordering within a browser (Unless you put all the properties in individual objects inside of an array.)

[{54: "a"}, {56: "b"}, {6: "c"}, {5, "d"}]

[pavelkunc]

Thanks for explanation.