Dennis Ritchie

John McCarthy

September 9, 1941 - October 12, 2011 

Source

September 4, 1927 - October 24, 2011

Source

Lisp ?

• Common Lisp
• Scheme
• Clojure
• Racket

• Common Lisp HyperSpec

Who cares about lisp ?

• Reddit
• Netflix
• Puppet
• Prismatic

• emacs
• LightTable
• mirai

• Clojure success stories
• LispWorks success stories

Ready ?

Polish notation

Let me wikipedia that for you

"Lots of Irritating Superflous Parenthesis"

(defpackage simple-app
  (:use :cl
        :clack))
(in-package :simple-app)

(defvar *handler*
    (clackup
      #'(lambda (env)
          '(200 (:content-type "text/plain") ("Hello, Clack!")))))

Source

Example !

Demo time !

Variables

• defvar, defparameter
• defconstant
• setq
• let, let*

Functions

• defun (rest, optional)
• funcall, apply
• lambda

Conditions and predicates

• if
• cond
• and, or, not
• oddp, evenp
• functionp, listp, numberp, stringp...
• eq, eql, equal

more info

Loops

• dolist
• dotimes
• do
• loop

Lisp stands for LISt Processing

• cons
• car, cdr
• mapcar

Magic operators

• quote '
• backquote ` and comma ,
• sharpsign-quote #'

DEFMACRO, MACROEXPAND

(defmacro let1 (var val &body body)
  `(let ((,var ,val))
  ,@body))

The macro

The use

(let1 foo (+ 2 3)
  (princ "Lisp is awesome!")
  (* foo foo))

The expansion

(macroexpand '(let1 foo (+ 2 3)
  (* foo foo)))

Macros

• 3 steps:
  • write sample call and expansion
  • write generative code
  • prevent leaks
• plip, plop

Conclusion

Land of lisp

Practical common lisp

Epic books

Buy it !

Buy it !

Epic links

• Lispdoc
• Common Lisp HyperSpec
• Beating the averages
• Lispers

• Quicklisp
• Quickdocs
• CL21

Questions ?