Hi Riesta,
You could also copy/paste the String_Join function from this Forge component (which is for Mobile) into your Reactive module. It does the same thing as Joao showed you, only now you don’t have to build it yourself. These text utils are all client actions which you could directly use on your screen.
You could also convert the Mobile module into a Reactive module first. Just open the Text Utils module and then open the Module menu >> select Convert >> Convert to Reactive Module and publish it.
Now you can add the String_Join client action as a dependency to your module and use it directly inside an Expression like this:
String_Join(TextList, “,”)
Hope this helps.
Regards,
Nordin