Clojure on NodeBuilding a CLI utility

Why?• Startup speed - Node.js apps start faster• Easier distribution -- ```npm install -g

<app>```• Way to learn core.async• AWS Lambda/Google Cloud Functions

(serverless architecture)• Server-side rendering

ClojureScript build process

*.cljs files

*.js file(s)

Google Closurecompiler

ClojureScriptcompiler

compiles cljs->js

compilesjs->optimized-js

Setting up Leiningen

Setting up Leinigen (cont'd)

Hello, World!

Building

Read Eval Print Loop demo

REPLstarts

nodejs process on random port

does this:

and sends user commands to nodejs process, started by repl-env, over the network socket

used by IDEs

Parsing ars - clj.tools.cli

Parsing args (cont'd)

Interop with Node.js libraries

compiles into

Callbacks

core.async for callbacks

https://github.com/georgewsinger/cljs-callback-heaven/blob/master/src/cljs_callback_heaven/core.cljs

core.async for callbacks (cont'd)

https://github.com/mailhog/MailHog

core.async for promises

Links• clojars.org/<template-name>/lein-template

=>```lein new <template-name> <project-name>```

• https://clojars.org/cljs-node/lein-template• https://clojars.org/cljs-node-app/lein-template• https://clojars.org/node-cljs/lein-template• https://clojars.org/node-cli/lein-template• https://github.com/karolisl/repomaker -- my cljs-node project• https://github.com/Gozala/node.core -- some helper functions working on

node• https://github.com/GregorStocks/cljs-http-node -- core.async based http

client for node