Since ECMAScript v5 if I remember correctly object keys are ordered, because under the hood List object should be used to store keys.
On Mon, Dec 16, 2024 at 4:37 PM Martin Honnen <[email protected]> wrote: > > Am 16.12.2024 um 15:19 schrieb Oleksandr Shpak: > > Hi Martin, > > I found even more weird situation > parse-json('{"1:aa": 1, "2:bb": 2}') > returns > {"2:bb":2.0e0,"1:aa":1.0e0} > > Seems like order is inversed > But, > parse-json('{"aa": 1, "b": 2, "ab": 3}') > returns > {"aa":1.0e0,"ab":3.0e0,"b":2.0e0} > > and, finally > parse-json('{"aa": 1, "b": 2, "ab": 3, "1:aa": 1, "2:bb": 2}') > returns > {"aa":1.0e0,"ab":3.0e0,"b":2.0e0,"2:bb":2.0e0,"1:aa":1.0e0} > > 🤯 > > It seems like a bug to me ;) > > > As I said, in XPath 3.1 and XQuery 3.1 maps are unordered collections, you > might get any order when parsing a particular JSON into an XDM 3.1 map. > > If it is any help, in the BaseX fiddle you probably get/see the order > preservation you want/expect > <https://fiddle.basex.org/?share=%28%27query%21%275.**8.A6%21%27%27%7Emode%21%27XQuery+%7BBaseX6Type%21%27xml%27%29*A%7D%2C%5Cn579b024ab03.71%3A92%3Abb020%5C%21+4875parse-json%7B%22%286%7D%27%7Econtext7%5C%278%2C+9aa014A%29%22%01A9876540.*_> > . > > > > > If we are talking about the JSON standard, not xQuery, devs will expect > the function which behaves in the same way as it does in many other > languages. > > Well, I have been around long enough to remember JavaScript/ECMAScript > objects as unordered so some features change in the course of time, I also > think, Python, for instance only recently switched to some order > preservation in its dictionary type. > > I don't know what to suggest for the current BaseX release, unfortunately > http://www.woerteler.de/xquery/modules/ordered-map.html is not accessible. > -- s0rr0w
