#explicitley defined
var my_int:int = 99
var my_bool:bool = false
#infrerred
var inferred_string := "propably a string"
var inferred_int := 55
var infrerred_bool := true
#declared
var a_variable
func _ready():
var label_a = $LabelA
var label_b = $LabelB
func do_nothing_func(labela:Label, labelb) :
print(labela)
print(labelb)
...
https://www.youtube.com/watch?v=WTKBa-zyNaM