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(Clojure) @samflores

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Lisp

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Lots of InSignificant Parenthesis

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LISt Processing

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(1 2 3) *

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Homoiconicidade

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(+ 2 3) ; 5

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(+ 2 4 6) ; 12

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(doc +) clojure.core/+ ([] [x] [x y] [x y & more]) Returns the sum of nums. (+) returns 0. Does not auto-promote longs, will throw on overflow. See also: +'

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Funcional

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(odd? 2) ; false

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(def par? (fn [n] (even? n))) (par? 2); true

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(def par? even?) (par? 2); true

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(defn greet [name] (str "Hello, " name)) (greet "John"); Hello, John

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(map :name [{:name "John" :age 15} {:name "Mary" :age 10}])

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(reduce + (range 10))

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(apply + (repeat 30 8)) ; 240

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(def dobra (partial * 2)) (dobra 5) ; 10

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Simplicidade

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def fn #() if do let quote ‘() var #’() loop recur throw try formas especiais

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alias and BEGIN begin break case class def defined? do else elsif END end ensure for if in module next not or redo rescue retry return self super then undef unless until when while yield Ruby

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assert break class const continue default do double else enum extends final finally float for goto if implements import instanceof int interface long native new package private protected public return short static strictfp super switch synchronized this throw throws transient try void volatile while Java

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Pragmatismo

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(def b 2r101010) (def n 1337N) (def m 3.14159M) (def r #"(\d+)") data types

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(def l '(1 2 3)) (def v [1 2 3]) (def m {:a 1 :b 2}) (def s #{:x :y :z}) data types

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JVM*

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(def today (java.Util.Date.)) (.year today) ; today.year() (Integer/parseInt "10") Java interop

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Imutabilidade*

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(def l '(1)) (conj l 2) (prn l) ; (1)

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& Concorrência Paralelismo

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STM atoms agents delays futures promisses refs core.async …

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(def l (atom [])) (swap! l conj 1) atoms

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(def c (agent 0)) (send c inc) (send c dec) (await c) agents

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(defn long-running-job [n] (Thread/sleep 3000) (+ n 10)) (pmap long-running-job (range 100)) pmap

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(def ch (chan)) (go (print (

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Environment

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(defroute "/" [] (home-handler)) (defroute "/:user” [user] (profile-handler user)) compojure

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:dependencies [[org.clojure/clojure "1.6.0"] [org.clojure/core.async "0.1.346.0-17112a-alpha"]] leiningen

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$ lein deps $ lein ring server leiningen

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(select user (with address) (fields :firstName :lastName :address.state) (where {:email "[email protected]"})) korma

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ClojureScript core.typed datomic Clojars jetty http-kit …

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Comunidade

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clojure.org clojure-doc.org clojuredocs.org grimoire.arrdem.com #clojure FreeNode

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(obrigado) @samflores