You’ve already finished two of the main tasks in this book: implementing some data-mining algorithms for analyzing clients and their purchases and looking at several ways to save the information about purchases in a durable container. This chapter is the starting point of the last task: creating a domain-specific language (DSL) for expressing offers to be applied in the Time Machine Store. You will provide a set of combinators to create the offers, which are initially basic offers.
Not all offers expressible in this language will be valid. The interesting ...
