How to create a variable that won't become negative

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:bust_in_silhouette: Asked By MightyRat

I created a global variable, but during the game I don’t want that the variable became negative. For now I do this:

If variable > 0
variable -= 1

But it is becoming boring to do with all the items and stuffs in game…

:bust_in_silhouette: Reply From: jgodfrey

You can create a setter function for the variable. In that function, you can pre-process the value before accepting, rejecting, or changing it.

So, for example, in your global script ( in this case):

# set up the var and define a setter function
var pos_var = 1 setget pos_var_set

# here, only accept the value if it's positive. Otherwise, set it to zero.
func pos_var_set(new_val):
   if new_val > 0:
	   pos_var = new_val
	   pos_var = 0

Now, from some other script, you won’t be able to set the var to a negative value

func _ready():
	Globals.pos_var = 2
	Globals.pos_var -= 10
	Globals.pos_var = -100

See the docs here for details: