[betterunix2]

Classes are a combination of member variables, methods, and method dispatch (which is important for inheritance). So let's emulate that combination with a closure in Lisp:

  (defun constructor (x y)
    (list (lambda (a) (+ x a)) (lambda (a) (* y a))))

This is essentially a "v-table" as you would have in C++. Inheritance would be exactly what you expect: replacing v-table methods in child class constructors. Lisp is untyped but if you wanted to do this in a typed language then a class type would just be the types of the methods that can be applied and what index in the v-table each method type has, similar to duck typing (except that the methods are "named" by v-table index). Note that members are private, and can only be accessed if the interface (v-table type) allows it, and that in a pure implementation you would have immutable objects so "setters" would have to recursively call the constructor.