Lists and Pairs¶
Lists and pairs are the fundamental entities in Scheme programming, which is pretty natural as Scheme is a member of the LISP family of languages whose name is derived from LISt Processing. We have already touched lists in the course of discussing expressions, but now we are going to have a much closer look at them. Lists are constructed from pairs, so it's actually the pair that makes the foundation of Scheme's data structures.
There are so many walls one can run into with lists and pairs when one isn't perfectly clear about all the different quotes and backticks, dots and parens and how to apply all those. Therefore it is really well-spent time and energy to get one's head properly around them.