Eliminate duplicates in array (JSONiq)

Question

I\'d like to delete duplicates in a JSONiq array.

let $x := [1, 2, 4 ,3, 3, 3, 1, 2, 5]

How can I eliminate the duplicates in $x?

Answer 1

regexp:replace is definitely not the way to go for this problem.

While Matthias's solution does not work on Try Zorba, this script does:

let $x := [1, 2, 4 ,3, 3, 3, 1, 2, 5]
return [ distinct-values( jn:members($x) ) ]

It returns (try out on above link):

[ 1, 2, 3, 4, 5 ]

Script needs to be a bit more verbose for DataPower Gateways JSONiq processor. There you get pretty-printed result for free:

$ cat dv.xq 
declare namespace output = "http://www.w3.org/2010/xslt-xquery-serialization";

declare option output:method "json";
declare option jsoniq-version "0.4.42";

[ distinct-values( jn:members(.) ) ]
$ 
$ coproc2 dv.xq <(echo '[1, 2, 4 ,3, 3, 3, 1, 2, 5]') http://dp1-l3:2226; echo

[
  1,
  2,
  4,
  3,
  5
]
$ 

Hermann.