How to set expando property of JScript with proper Javascript/ECMA?

Question

I'm writing XP-VAPI scripts in HP ALM and some objects of the OTA-API use a construct which looks like this:

object.Field('nameOfField') = newValue;

Obviously this is not valid in Javascript. But because I use an IDE that checks the syntax according to ECMA standards this is shown as a syntax error. So I wonder is there a way to do this assignment with a proper Javascript syntax? I tried the following variants with no success:

CurrentRun.Field("RN_USER_13").value = 'pfusch';
CurrentRun.Field.RN_USER_13 = 'pfusch';
CurrentRun.Field["RN_USER_13"] = 'pfusch';
CurrentRun["RN_USER_13"] = 'pfusch';
CurrentRun.RN_USER_13 = 'pfusch';

Answer 1

Try this:

Object.defineProperty(CurrentRun,'RN_USER_13',{
  enumerable: true,
  configurable: true,
  writable: true,
  value: 'pfusch'
})

Here is a reference for Object.defineProperty and here is a great SO post about that topic: how to use javascript Object.defineProperty