Working with Selection Sets
Selections are kind of different that any other thing AutoLISP works with - You can think of them as a list of entity names, but you can't use list manipulation functions on them
Two good ways of working through a selection set (doing some action to each item in the selection set)
- If you need to keep the selection set for later use, use a counter and step through by increasing the counter
- If you wont need the selection set again, repeatedly read the first item then delete it from the selection set, then read the first item, etc.