Lists are maybe the most important building blocks in Scheme, and processing lists is fundamental to working with Scheme. Having a better understanding now how lists are organized we will investigate a number of higher-level operations that can be done with lists.
The first topic to be covered is accessing lists and retrieving their elements
beyond the basic car and cdr procedures. After that we'll investigate how
to retrieve specific elements from lists and how lists can be modified. Finally
we'll see how to process all elements of a list in sequence.
This chapter will not cover all list operations comprehensively, as this is the task of the official reference. However, in order to make efficient use of the reference it is necessary to have a good understanding of the concepts, and therefore I will cover a subset of the functionality at a slower pace.