clojure
“revenge of the verbs”
tim@lossen.de
2008-12-04

LISP
dynamic, functional, lazy
_not_ object-oriented
compiled (to JVM bytecode)
on-the-fly or ahead-of-time

(def fibs (lazy-cat '(0 1)
(map + fibs (drop 1 fibs))))

Syntax

Nothing nil
Booleans true false
Numbers 10 22.31 2/3

Strings ”foo”
Characters \\a \\space \\newline
Regexps #”[a-z]+”

Comments ;this is a hack
Symbols foo namespace/foo
java.util.BitSet
Keywords :foo :bar

Lists (a b c)
Vectors [1 2 3]
Maps {:a 1 :b 2}
Sets #{:a :b :c}

Semantics

literals evaluate to themselves
vectors and maps are data
symbols are resolved
non-empty lists are calls

calls (operator operands*)
special forms def if let fn
macros and defn time
functions + = str println
large sequence library

Concurrency

persistent data structures
“state - you’re doing it wrong”
lists, vectors, maps, sets ...
structural sharing

Vars - thread-local
Refs - transactional
Agents - asynchronous

Links

Project http://clojure.org
Presentations http://clojure.blip.tv
Book “Programming Clojure” (beta)
http://pragprog.com/titles/shcloj
TextMate Bundle http://github.com/
nullstyle/clojure-tmbundle/