Camunda 8 / FEEL: "list comprehension"

[sts]

Hey guys, I need some FEEL help: I have an array of objects, like

[
{"id": "id1", "data": "data1"},
{"id": "id2", "data": "data2"},
{"id": "id3", "data": "data3"}
]

What I would need is a corresponding list of strings like

["id1", "id2", "id3"]

Basically, [x.id for x in list] in Python. Or even better, a string, containing the ids like

"id1, id2, id3"

What is a good way to do that in FEEL / Camunda Modeller?

Best regards!

[Niall]

Sure thats easy enough.
If the varialbe is something like this

{"myData" : [
{"id": "id1", "data": "data1"},
{"id": "id2", "data": "data2"},
{"id": "id3", "data": "data3"}
]
}

Then you’d just need to use the expression myData.id and it would return

[
  "id1",
  "id2",
  "id3"
]

You can see how it works by checking out this example in the FEEL playground

If you want to return a single String value - it’s also quite easy. Just use this
string join (myData.id, ",")
And the return will be

"id1,id2,id3"