A structure is an advanced datatype available in Common Lisp. Structures and their properties can be a useful way to represent data in your code.
Structures can be used to represent objects with properties, as you might find in a typical object-oriented programming (OOP) language using the
defstruct command, like so:
According to the definition in this structure, a
person has four properties (also called slots by Lispers):
Having defined this structure, we can create instances of a person using the
make-person command, a special function that
defstruct has automatically created for us: