Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Clojure for PHP Developers
Search
Ian Barber
May 25, 2012
Technology
6
1.8k
Clojure for PHP Developers
My introduction to Clojure from PHP Tek 12 #tek12
Ian Barber
May 25, 2012
Tweet
Share
More Decks by Ian Barber
See All by Ian Barber
Crossing Platforms With Google+ Sign-In
ianbarber
0
130
How Google Builds Webservices
ianbarber
3
300
Mobile & Social
ianbarber
2
140
Event Stream Processing In PHP
ianbarber
7
2.3k
Building A Firehose - PHPNW
ianbarber
2
830
Building a Firehose
ianbarber
5
1.2k
Taking Sites Mobile
ianbarber
1
490
The Cookie Law
ianbarber
1
810
Teaching Your Machine To Find Fraudsters
ianbarber
3
920
Other Decks in Technology
See All in Technology
Cracking the KubeCon CfP
inductor
2
270
IaCジェネレーターとBedrockで詳細設計書を生成してみた
tsukasa_ishimaru
4
890
開発パフォーマンスを最大化するための開発体制
ham0215
7
1.1k
M&A戦略を支えるデータマネジメント (MIDAS Tech Study #16 GENDA Komiyama)
kommy339
1
120
Google Cloud Next '24でブログを10本書いた方法と勉強会を沸かせた方法
yasumuusan
0
340
Microsoft for Startups Founders Hub_20240429 update
daikikanemitsu
1
2.4k
JAWS-UG Bedrock Claude Night
yamahiro
3
730
web-application-security
matsuihidetoshi
1
190
MixIT 2024 - Pulumi : Gérer son infra avec son langage de programmation préféré
ju_hnny5
1
120
Android Target SDK 35 (Android 15) 対応の概要
akkie76
0
160
Building a RAG-poweredAI chat appwith Python and VS Code
pamelafox
0
160
チームでロジカルシンキングに改めて向き合っている話 〜学習環境と実践⽅法〜
sansantech
PRO
3
3.3k
Featured
See All Featured
Learning to Love Humans: Emotional Interface Design
aarron
267
39k
Six Lessons from altMBA
skipperchong
22
3k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
126
32k
StorybookのUI Testing Handbookを読んだ
zakiyama
13
4.6k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
660
120k
How GitHub (no longer) Works
holman
305
140k
Designing with Data
zakiwarfel
96
4.8k
Web Components: a chance to create the future
zenorocha
306
41k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
323
20k
The Cost Of JavaScript in 2023
addyosmani
20
3.9k
How to name files
jennybc
65
93k
Fashionably flexible responsive web design (full day workshop)
malarkey
398
65k
Transcript
ian barber -
[email protected]
- @ianbarber CLOJURE FOR PHP DEVELOPERS
WHAT IS CLOJURE AND WHAT IS IT GOOD FOR?
INSTALLING CLOJURE mac osx $ brew install rlwrap leiningen debian
/ ubtuntu $ apt-get install leiningen windows https://github.com/technomancy/leiningen http://dev.clojure.org/display/doc/Getting+Started
SEQUENCES CONCURRENCY WITH STM REPL $ lein repl REPL started;
user=>
READ EVALUATE PRINT LOOP
(ns boids.core (:use [quil.core])) (def wwidth 646) ; Map width
(def wheight 400) ; Map height (def avoid-dist 20) ; Stay this far apart (def col-dist 35) ; Avoid columns (def col-size 30) ; Column size (def infl-dist 100) ; Boids influence (def boid-count 50) ; How many boids (def boid-diam 5) ; Size of a boid (def max-speed 6) ; Boid max speed https://github.com/ianbarber/Boids
/* Head towards the rest of the boids */ function
attract($x, $y, $boids) { $cboids = closest($x, $y, $boids, 100); $boid_count = count($boids) == 0 ? count($boids) : 1; $sum_x = $sum_y = 0; foreach ($cboids as $boid) { $sum_x += $boid['x']; $sum_y += $boid['y']; } $x_average = $sum_x / $boid_count; $y_average = $sum_y / $boid_count; return array( ($x_average - $x), ($y_average - $y) ); }
/* Head towards the rest of the boids */ defn
attract(x, y, boids) { cboids = closest(x, y, boids, 100); boid_count = count(boids) == 0 ? count(boids) : 1; sum_x = sum_y = 0; foreach (cboids as boid) { sum_x += boid['x']; sum_y += boid['y']; } x_average = sum_x / boid_count; y_average = sum_y / boid_count; return array( (x_average - x), (y_average - y) ); }
/* Head towards the rest of the boids */ (defn
attract [x y boids] cboids = (closest x y boids 100) boid_count = (count boids) == 0 ? (count boids) : 1 sum_x = sum_y = 0 foreach (cboids as boid) { sum_x += (:x boid) sum_y += (:y boid) } x_average = (/ sum_x boid_count) y_average = (/ sum_y boid_count) [ (- x_average x) (- y_average y) ] )
(defn attract "Head towards the rest of the boids" [x
y boids] (let [ cboids (closest x y boids 100) boid_count (if (= 0 (count boids)) 0 (count boids)) [sum_x sum_y] foreach (cboids as boid){ sum_x += (:x boid) sum_y += (:y boid) } x_average] (/ sum_x boid_count) y_average (/ sum_y boid_count) ] [ (- x_average x) (- y_average y) ] )
(let [ [sum_x sum_y] (reduce (fn [[sum_x sum_y] boid] [(+
sum_x (:x boid)) (+ sum_y (:y boid))] [0 0] cboids) ]) list($sum_x, $sum_y) = array_reduce($cboids, function($boid, $sum) { return array( $sum[0] + $boid['x'], $sum[1] + $boid['y']); }, array(0,0));
UNIT TESTING (ns boids.test.core (:use [boids.core] :reload) (:use [clojure.test])) (deftest
test-create-boid (is (= 10 (:x (create-boid 10 0 0 0 []))) "Create boid does not include x val")) (deftest test-close-boids (is (= 1 (count (close-boids 60 60 #{(create-boid 80 30 10 10 [])} 100 ))) "Close boids does not include expected"))
SEQUENCES Refs Atomics Agents (first '(1 2 3)) ;; 1
(nth [1 2 3] 1) ;; 2 (first {:a 1 :b 2 :c 3}) ;; [:a 1] (rest #{:a :b :c}) ;; (:c :b) (defn fib [a b] (lazy-seq (cons a (fib b (+ b a))))) ;; #'user/fib (take 5 (fib 1 1)) ;; (1 1 2 3 5)
INFINITE SEQUNCES (def users (cycle [1 2 3 4 5]))
(defn slow-search [user] (Thread/sleep 1000) (println "Loop") (if (> (rand-int 4) 1) true false)) (def immediate-user (first (filter slow-search users))) ;; Loops 6 times (time (print immediate-user)) (2)"Elapsed time: 0.119 msecs"
DELAYED EXECUTION (def lazy-user (take 1 (filter slow-search users))) ;;
Immediate return (time (print lazy-user)) ;; Loops 6 times (1) "Elapsed time: 5018.576 msecs" (time (print lazy-user)) (1)"Elapsed time: 0.185 msecs"
CONCURRENCY WITH STM ? CORE CORE CORE CORE
CONCURRENCY WITH STM A 1 A 2 A 3 A
4 STATE IDENTITY
Refs Atomics Agents (defn updateit [] (swap! mystate assoc :punctuation
"!")) (def mystate (atom {:name "hello" :value "world"})) (let [foo @mystate] (future (updateit)) (println foo) (println @mystate) (Thread/sleep 1000) (println foo) (println @mystate)) {:name hello, :value world} {:name hello, :value world} {:name hello, :value world} {:punctuation !, :name hello, :value world}
STM - REFS Refs Atomics Agents (def ted (ref 0))
(def bob (ref 0)) (defn pickup [user gold] (dosync (commute user + gold))) (defn transfer [from to gold] (dosync (if (> (deref from) gold) (do (alter from - gold) (alter to + gold)) false))) (pickup ted 100) (pickup bob 20) (transfer bob ted 25) ; false (transfer bob ted 19) ; 120 / 1
STM - AGENTS (def boids (take 5 (repeatedly #(agent {:x
(rand-int 100) :y (rand-int 100)})))) (defn getav [dim b] (int (/ (reduce + (map dim b)) (count b))) ) (defn behave [boid boids] (Thread/sleep 5000) {:x (getav :x boids) :y (getav :y boids)} )
STM - AGENTS (doseq [boid boids] (send boid behave (remove
#(= @boid %) (map deref boids)))) (time (apply await boids)) ;; "Elapsed time: 9997.488 msecs" (doseq [boid boids] (send-off boid behave (remove #(= @boid %) (map deref boids)))) (time (apply await boids)) ;; "Elapsed time: 4979.295 msecs"
LEIN PROJECT FILE (defproject textapp "0.1.0-SNAPSHOT" :description "Simple text analysis
rest service" :dependencies [ [org.clojure/clojure "1.3.0"] [clojure-opennlp "0.1.9"] [noir "1.2.1"]] :main textapp.server) https://github.com/ianbarber/Textservice $ lein noir new textapp
(defpage [:post "/verbatim"] {text :text :or {text ""}} (if (blank?
text) (resp/json {:error "Invalid Input"}) (resp/json {:tagged (tagger (tokeniser text))} )))
CALL FROM CURL $ curl -X POST http://localhost:8080/ verbatim -d
"text=Hello+world+how+are +things+with+you?" {"tagged":[["Hello","UH"],["world","NN"], ["how","WRB"],["are","VBP"], ["things","NNS"],["with","IN"], ["you","PRP"],["?","."]]}
(defmethod make-pos-tagger POSModel [model] (fn pos-tagger [tokens] (let [ token-array
(into-array tokens) tagger (POSTaggerME. model *beam-size*) tags (.tag tagger token-array) ] (with-meta (map vector tokens tags)))))
http://clojure.org/ WHERE TO GO NEXT? http://blip.tv/clojure
ian barber -
[email protected]
- @ianbarber THANKS!
http://flickr.com/photos/usarmyafrica/4456204113 http://flickr.com/photos/puliarfanita/6648892997 IMAGE CREDITS