Exercise 1.4.7
Lists
A list is either the empty list, or a chain of Cons-Cells ending with the empty list.
* (listp nil)
T
* (listp (cons 5 nil))
T
If you cons something onto the empty list, you get the list of that thing.
* (cons 5 nil)
(5)
We can exploit the Cons-Cells' ability to contain heterogenous data in order to represent linked lists or trees.
* (cons 3 (cons 2 (cons 1 nil)))
(3 2 1)
Learn Lisp The Hard Way by "the Phoeron" Colin J.E. Lupton is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.