Object properties won't print

[Mike D1]

Hi

I am trying to print properties of a user object in background script using the following:

var testUser = gs.getUser().getUserByID('test test 3');
gs.print(Object.getOwnPropertyNames(testUser));

and am getting the following error:

Evaluator: com.glide.script.RhinoEcmaError: Expected argument of type object, but instead had type object
   script : Line(2) column(0)
      1: var testUser = gs.getUser().getUserByID('test test 3');
==>   2: gs.print(Object.getOwnPropertyNames(testUser));

Not sure what I am doing wrong here?

Thanks

Mike

[Mike D1]

Object.getOwnPropertyNames seems to work with GlideRecord object, so am interested to know how I can get this to work with 

gs.getUser().getUserByID()

[Bert_c1]

I found:

https://docs.servicenow.com/bundle/utah-api-reference/page/script/JavaScript-engine-upgrade/referenc...

for 'Object.getOwnPropertyNames' documentation. Maybe that will help. And I've never gotten expected results when using un-documented APIs.  Hopefully others here something more to offer.