looping through a dictionary

RE: looping through a dictionary

aj2000 — Thu, 22 Dec 2022 22:59:24 GMT

That's... silly...
I don't quite understand how to output a dictionary after that. Is there a way to build a dictionary or map?
I can loop over the keys with forEach, but the output is always an array. I'd like to iterate over a dictionary or map to transform it into a new map but I can't seem to see how to add keys to an existing map, or mutate the value of an existing key. Are dictionaries and maps just immutable? It doesn't say that clearly anywhere in the documentation.
I have a large dictionary and I want to find a few keys and change them slightly without re-declaring the whole dictionary in an expression. Is this possible? I've opened a discussion here (https://community.appian.com/discussions/f/data/26960/mutate-a-dictionary-or-map) but I posted another discussion question about something else a month ago and nobody has replied so the community here doesn't look very active to me. I was shocked and happy that you replied here.

RE: looping through a dictionary

Mike Schmitt — Thu, 22 Dec 2022 22:02:19 GMT

It was hard (if possible at all requiring weird work-arounds).

RE: looping through a dictionary

aj2000 — Thu, 22 Dec 2022 21:28:06 GMT

Could you just not loop through a dictionary until version 21.4...? How did you do it before that?

RE: looping through a dictionary

Marco — Fri, 01 Apr 2022 19:43:58 GMT

Perfect, that's what I needed!

RE: looping through a dictionary

Mathieu Drouin — Fri, 01 Apr 2022 19:43:06 GMT

There's also the getKeysFromDictionary function from the https://community.appian.com/b/appmarket/posts/cdt-manipulation plugin if you're on a version prior to 21.4.

RE: looping through a dictionary

Mike Schmitt — Fri, 01 Apr 2022 19:32:50 GMT

In 21.4 we got the new function a!keys, which grabs all keys used within a dictionary and returns them in a text array.