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O Último Transpiler Que Você Irá Precisar

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Conhecendo ClojureScript

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CoffeeScript

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CoffeeScript → ✨ → JavaScript

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https://en.wiktionary.org/wiki/transcompiler trans- + compiler ! A translating compiler that takes the source code of a programming language as its input and outputs the source code into another programming language.

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JavaScript é… peculiar

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Plataforma poderosa

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Browser

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Servidor

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Dispositivos Móveis

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Desktop

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Internet of Things

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Serverless

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Muitas Armadilhas

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https://goblinrefuge.com/mediagoblin/u/mindaslab/m/javascript-the-bad-parts/

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Evolução Instável

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Regida por um Comitê

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Diferentes Implementações

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JavaScript → ✨ → JavaScript

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arrow functions, string interpolation, destructuring assignments, modules, classes, generators, etc…

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TypeScript, Elm…

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ClojureScript

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–Rich Hickey "Why are we doing this? Because Clojure rocks, and JavaScript reaches"

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Clojure é um LISP

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"Hello World"

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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{:name "Andrew Rosa" :events [{:name "RuPy Campinas" :year 2016 :tags #{:ruby, :python, :js} :location "FEEC - Unicamp"}]}

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(+ 1 2)

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(+ 1 2)

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(+ 1 2)

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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(defn greet "Returns a friendly greeting." [name] (str "Hello, " name))

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Macros

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• Retornar todos resultados de um termo de busca • Acumular resultados de páginas, imagens e vídeos • Buscar em múltiplos servidores, retornar resultado do mais rápido • Manter um timeout de toda operação, protegendo de servidores lentos

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c := make(chan Result) go func() { c <- First(query, Web1, Web2) } () go func() { c <- First(query, Image1, Image2) } () go func() { c <- First(query, Video1, Video2) } () timeout := time.After(80 * time.Millisecond) for i := 0; i < 3; i++ { select { case result := <-c: results = append(results, result) case <-timeout: fmt.Println("timed out") return } } return

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(defn google [query] (let [c (chan) t (timeout 80)] (go (>! c (! c (! c (

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Sem Callbacks :)

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Extensibilidade!

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Paradigma Funcional

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Favorece Imutabilidade

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Estruturas Persistentes

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! (let [v [1, 2]] (println v) (println (conj v 3)) (println v)) ! ;; => [1, 2] ;; => [1, 2, 3] ;; => [1, 2]

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! (let [v [1, 2]] (println v) (println (conj v 3)) (println v)) ! ;; => [1, 2] ;; => [1, 2, 3] ;; => [1, 2]

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! (let [v [1, 2]] (println v) (println (conj v 3)) (println v)) ! ;; => [1, 2] ;; => [1, 2, 3] ;; => [1, 2]

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! (let [v [1, 2]] (println v) (println (conj v 3)) (println v)) ! ;; => [1, 2] ;; => [1, 2, 3] ;; => [1, 2]

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! (let [v [1, 2]] (println v) (println (conj v 3)) (println v)) ! ;; => [1, 2] ;; => [1, 2, 3] ;; => [1, 2]

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V 1 2

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V 1 2 3 V'

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React & Immutable.js

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Store View Action Renderiza Modifica Dispara

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Linguagem Simbiótica

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(.length "Hello, World!")

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(.length "Hello, World!")

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(.length "Hello, World!")

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(js/alert "Hello, World!")

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(js/alert "Hello, World!")

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(ns my.namespace) ! (defn ^:export hello [] (println "Hello, World!"))

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(ns my.namespace) ! (defn ^:export hello [] (println "Hello, World!"))

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(ns my.namespace) ! (defn ^:export hello [] (println "Hello, World!"))

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my.namespace.hello();

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Om, Reagent, Rum

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Google Closure

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Standard Library

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left-pad?

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goog.*

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GC Compiler

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Dead Code Elimination

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Cross-Module Code Motion

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Public Admin

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Public Admin

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Public Admin

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shared.js public.js admin.js

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Ferramentas

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Leiningen

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Figwheel

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Demo

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Aprender mais? • http://clojurescriptkoans.com • http://www.braveclojure.com • Clojure Brasil (Facebook) • clj-br (YouTube) • #clojure-brasil (Slack: http://clojurians.net)

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?

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Obrigado! @andrewhr_