Land of Lisp

Describing Objects at a Specific Location

To create the final piece of code to help us visualize our game world, we need to describe the objects on the floor at a given location, which a player can pick up and use.

Listing Visible Objects

To do so, we first create a list of the objects:

> (defparameter *objects* '(whiskey bucket frog chain))
*OBJECTS*

We can also create a second variable, *object-locations*, to track the location of each object in the form of an alist:

(defparameter *object-locations* '((whiskey living-room)
                                   (bucket living-room)
                                   (chain garden)
                                   (frog garden)))

Next, we write a function that lists the objects visible from a given location: ...