Function IsNull

IsNull(v)

The function verifies if a variable or a value is null. Example:

a = 10   ' a is a number
b = "10" ' b is a string
c = null ' c is null

if IsNull (a) ' not true
	DrawText(10, 10, "a is null")
elseif IsNull (b) ' not true
	DrawText(10, 10, "b is null")
elseif IsNull (c) ' true
	DrawText(10, 10, "c is null")
end if