LazyK-Lisp

A toy Lisp interpreter in Lazy K.

How to Use

$ lazyk lisp.lazy
> (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
> (set 'count 0)
0
> (defun incr () (set 'count (+ count 1)))
incr
> (incr)
1
> (incr)
2
> (incr)
3

Builtin Functions

• car
• cdr
• cons
• eq (can compare numbers)
• atom
• +, -, *, /, mod
• set

Special Forms

• quote
• if
• lambda
• defun

Links

• The Lazy K Programming Language
• Lazy K interpreter
• Online Lazy K interpreter