one-page.lisp

;;;; All you need to know about lisp in one screen
;;;; Humberto Ortiz-Zuazaga <humberto.ortiz@upr.edu>

;;; The identity function takes one argument and returns it
(defun id (x) x)

;;; You can apply it to anything
(id 23.45) 				; numbers 
(id 'foo)				; symbols
(id "bar")				; strings
(id '(This is a list.))			; lists

;;; Lisp is mostly parens function arguments parens => value
(+ 3 5)
;;; Nested however you want
(* (+ 1 4) (- 7 4))

;; even functions can be values
#'id
;; functions can be arguments (and be returned)
(id #'id)
;; and you can call functions returned as values
(funcall (id #'id) (* 3 4))

;;; The simple syntax and power of functions lets you do anything.