Land of Lisp

What You've Learned

In this chapter, we discussed exotic types of lists and created a drawing library for mathematical graphs. Along the way, you learned the following:

• You can create lists in Lisp that end in a value other than nil. Such lists are displayed with an extra dot before the last item and are called dotted lists.

• Pairs are what you get when you cons together two items that are not lists themselves. They can also be thought of as dotted lists that contain only two items.

• Circular lists are lists where the last cons cell points to an earlier cons cell in the same list.

• Association lists (alists) are lists of pairs. They can be used to store data that is in the form of keys associated with values.

• Lisp syntax expressions are great for storing ...