Pushing a local var updates the global one

[Lupin_III]

Hi, Im spending lots of hours without success nor understanding why it happens.
I have a global variable (an array) stored in filesystem. In a function node I put a local variable equal to the global one. Then, working on the local variable I push the incoming message, but at each deployng the the global variable is updated. I don't put global.set(...) and I don't want to change the global variable. How can I solve it? Thanks a lot
This are the function node and the global variables before deploying

This are the debug nodes and the global variables after the first deploying

This are the debug nodes and the global variables after the second deploying

[knolleary]

Please see this topic for the explanation of this behaviour:

Global.put not needed as variable altered by reference?

JavaScript passes objects around by reference rather than by value. So the call to global.get() returns a reference to the object in context. Any modification of the object will modify the object in context. If you want to modify the object without modifying what is in context, you have to clone it first. We provide the RED.util.cloneMessage function that can be used for this: var value = RED.util.cloneMessage( global.get("myValue") );

[Lupin_III]

Thanks Knolleary. This happen only for global, not for flow, is that correct?
Thanks a lot