question

We have cloud script with some global variables declared. We fill those variables in different methods inside our logic. One of the methods append a string to a variable, but consecutive calls to execute cloud script show that variable having duplicates of the appending that only happens once per call. We already implemented it so the problem doesn't happen but I want to understand more about how cloud script works because I couldn't find a single clue in the documentation regarding this issue. The code was something like this:

myVar = "";
MyAppend = function (data)
{
  myVar += "myData";
} 

Then when I returned the value of myVar, sometimes I got:

{ "result" : "myData" } 

And some other times:

{ "result" : "myDatamyData" } 

Apparently at random. My guess is that the cloud script is saved somehow in between calls, like a reused instance, and if that is the case we need to know it for sure, so our implementations are made within those design restrictions. Thanks in advance.