Question

What does the following mean?

Class.Function(variable := 1 + 1) 

What is this operator called, and what does it do?

Answer 1

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')