Switching between dev/standalone mode

Hi all,

I have trouble to understand when I would call save() load() and reset(). I've declared a few global variables at the top of my espruino code:

var channel, led2State, debug;

These variables are initialized in an onInit() function, that I typically call manually once I have moved the code over to the device. The onInit() function is called once the device starts up - e.g. after a reset button click, right?

Now, I could also make the onIinit() call at the bottom of the code - once I flash the code over, it would execute the onInit() once, - just like after a reset. But a reset - if I understand correctly - will not execute the onInit() twice, as the call to onInit() is done by the system.

Are these assumptions correct?
Is it OK to declare global variables -what happens to these once I do a save()?

Thx
Sven