Docs or Videos to Help with Moving Along if Variable Does Not Yet Exist in Function Stack

Checking if there's a way to see if you know that the variable does not exist because it has not come into not to existence yet and most of the ways that I know how to check for those is if there's like no value associated with a variable, however, I was looking through the #Xano documentation and there was a reference to something called existence but that was only available in the add-ons of.

I have tried using many different varieties of ways, using the counting method, the get setter, null value, false values, but that's for array values to see if an array has value but or to see if a variable has values associated with it.

How do you go about checking and say hey if this variable doesn't exist yet in the function stack that it's okay to move on because it will in the next iteration.

One of the many reasons that I love about the #PRO program is that has just opened up recently to Xano community is now I have the confidence, If I cannot figure it out by myself which is a way to learn I know that Ray is there a multiple times a week to help me understanding the why behind the solution.

The regular office hours provided by the Xano leadership team are wonderful as well.