Chapter 6: Compound Data and Data Abstraction

Game State Representation 4

While we can't do much better than Representation 3, there is a final method.

Use constructor and selector procedures already built-in to Racket.

Racket supports an ADT called a pair:

A pair is constructed using the built-in procedure cons:

          (cons 4 5)

Racket prints the pair

as (4 . 5)