As lists are just variables with the same root name and a sequential number at the end, the length of a list can be determined by counting the number of names that match a certain pattern. This is done by the 'count' function:

MyList() = 4,8,5,2
for i = 1 to count MyList
  Print 'Element (i): (MyList(i))'

Element 1: 4
Element 2: 8
Element 3: 5
Element 4: 2

If no variable name matches, 'count' returns 0 to indicate that the list is empty / does not exist.