ClojureScriptwhat are you?

Roman Liutikov

http://www.lisperati.com/casting_spels.pdf

((((()))))

John McCarthy

• AI • LISP • Garbage collection

(ns app.core (:require [cljsjs.react-dom :refer [render]]))

(def app-component ;; code )

(render app-component (js/document.getElementById "app"))

Too many parens? not really ;)

(double 5) double(5)

Clojure JavaScript

Companies using ClojureScript

CircleCI Atlassian

Cisco eBay

ModnaKasta ! …

Because Clojure rocks, and JavaScript reaches.

— Rich Hickey

ClojureScript Release - Rich Hickeyhttps://www.youtube.com/watch?v=tVooR-dF_Ag

Why ClojureScript?• Functional programming

• Immutable data (mori in JS)

• Great standard library + Google Closure Libraries

• Interactive development

• Robust libraries

• Great optimizing compiler (dead code elimination, tree-shaking and more)

But it should be slow

http://swannodette.github.io/2013/06/10/porting-notchs-minecraft-demo-to-clojurescript/

http://thi.ng/

Learn once, use anywhere

• Server-side: JVM, Node.js

• Client-side: ClojureScript + React.js

• Desktop: ClojureScript + Electron

• Mobile: ClojureScript + React Native

Tools Code

• Atom, LightTable, Vim, Emacs, whatever…

• Parinfer

Tools Build

Tools Build

• Leiningen (dependencies + Grunt in JS)

• Boot (dependencies + Gulp in JS)

• Figwheel (Webpack’s HMR in JS)

• Devcards (visual interactive development)

Tools Debugging

• Source maps

• Dirac (Chrome DevTools with extra features for CLJS development)

Tools Testing

• cljs.test

• doo (multi env test runner, supports Karma)

SPA libraries

• Reagent + re-frame

• Om

• Rum

Libraries

• clojars.org (NPM in JS)

• cljsjs.github.io (for JS deps)

• clojurewerkz.org

• www.clojure-toolbox.com

How to try ClojureScript?

• jsbin.com

• cljsfiddle.com (Reagent)

• clojurescript.net (Web REPL)

• planck-repl.org (OSX REPL)

• Replete (iOS REPL)

ClojureScript for Skeptics - Derek Slagerhttps://www.youtube.com/watch?v=gsffg5xxFQI

Where to learn more?• clojurescriptkoans.com

• kanaka.github.io/clojurescript/web/synonym.html

• cljs.info/cheatsheet

• clojuredocs.org

• github.com/clojure/clojurescript/wiki

• gitter.im/dev-ua/clojure

• clojurians.net

(questions?)

Thanks!

@roman01la