Clojure

Apresentando Clojure hoje no encontro do GuruPI

Transcript

1. (Clojure) @samflores
2. Lisp
3. Lots of InSignificant Parenthesis
4. LISt Processing
5. (1 2 3) *
6. Homoiconicidade
7. (+ 2 3) ; 5
8. (+ 2 4 6) ; 12
9. (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: +'
10. Funcional
11. (odd? 2) ; false
12. (def par? (fn [n] (even? n))) (par? 2); true
13. (def par? even?) (par? 2); true
14. (defn greet [name] (str "Hello, " name)) (greet "John"); Hello, John
15. (map :name [{:name "John" :age 15} {:name "Mary" :age 10}])
16. (reduce + (range 10))
17. (apply + (repeat 30 8)) ; 240
18. (def dobra (partial * 2)) (dobra 5) ; 10
19. Simplicidade
20. def fn #() if do let quote ‘() var #’() loop recur throw try formas especiais
21. 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
22. 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
23. Pragmatismo
24. (def b 2r101010) (def n 1337N) (def m 3.14159M) (def r #"(\d+)") data types
25. (def l '(1 2 3)) (def v [1 2 3]) (def m {:a 1 :b 2}) (def s #{:x :y :z}) data types
26. JVM*
27. (def today (java.Util.Date.)) (.year today) ; today.year() (Integer/parseInt "10") Java interop
28. Imutabilidade*
29. (def l '(1)) (conj l 2) (prn l) ; (1)
30. & Concorrência Paralelismo
31. STM atoms agents delays futures promisses refs core.async …
32. (def l (atom [])) (swap! l conj 1) atoms
33. (def c (agent 0)) (send c inc) (send c dec) (await c) agents
34. (defn long-running-job [n] (Thread/sleep 3000) (+ n 10)) (pmap long-running-job (range 100)) pmap
35. (def ch (chan)) (go (print (<! ch))) (put! ch "Hi") core.async
36. Environment
37. (defroute "/" [] (home-handler)) (defroute "/:user” [user] (profile-handler user)) compojure
38. :dependencies [[org.clojure/clojure "1.6.0"] [org.clojure/core.async "0.1.346.0-17112a-alpha"]] leiningen
39. $ lein deps $ lein ring server leiningen
40. (select user (with address) (fields :firstName :lastName :address.state) (where {:email "me@mail.com"})) korma
41. ClojureScript core.typed datomic Clojars jetty http-kit …
42. Comunidade
43. clojure.org clojure-doc.org clojuredocs.org grimoire.arrdem.com #clojure FreeNode
44. (obrigado) @samflores