A toy Lisp interpreter in Unlambda.
$ unlambda lisp.unl
> (car '(a b c))
a
> (cdr '(a b c))
(b c)
> (cons 1 (cons 2 (cons 3 ())))
(1 2 3)
> (defun fact (n) (if (eq n 0) 1 (* n (fact (- n 1)))))
fact
> (fact 8)
40320
> (defun fib (n) (if (eq n 1) 1 (if (eq n 0) 1 (+ (fib (- n 1)) (fib (- n 2))))))
fib
> (fib 10)
89
> (cons 1 (call/cc (lambda (c) (cons 2 (c (cons 3 nil))))))
(1 3)
- car
- cdr
- cons
- eq (can compare numbers)
- atom
- +, -, *, /, mod
- call/cc
- quote
- if
- lambda
- defun