Hi Oleksandr, As Martin has summarized, the the current behavior is not a bug as the XQuery 3.x specification does not define order on maps. It is up to the implementation to choose an internal order for entries (usually realized via an immutable/persistent hash structure) that maximizes access time. With XQuery 4, as indicated, this is about to change. As you may have seen if you have clicked the Fiddle link, a proof-of-concept implementation is available now that demonstrates the new behavior. It is also included in the latest snapshot of BaseX [1]. We will further pursue it in BaseX, no matter how the spec evolves.
As for JavaScript, the JSON specification (RFC 8259) states that the order of key/value pairs is not guaranteed. In ECMAScript, however, orderedness was introduced with ES6. Hope this helps, Christian [1] https://files.basex.org/releases/latest/ On Mon, Dec 16, 2024 at 4:01 PM Oleksandr Shpak <shadow...@gmail.com> wrote: > 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 <martin.hon...@gmx.de> > 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 >
