What does the following mean?
Class.Function(variable := 1 + 1)
What is this operator called, and what does it do?
It is used to assign optional variables, without assigning the previous ones.
sub test(optional a as string = "", optional b as string = "")
msgbox(a & b)
end sub
you can now do
test(b:= "blaat")
'in stead of
test("", "blaat")