Slides for the talk I gave in Vilnius Clojure meetup about my experience in building Clojure CLI application on Node.js platform

1. Clojure on Node
Building a CLI utility

2. 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

3. ClojureScript build process
*.cljs files *.js file(s)
Google Closure
compiler
ClojureScript
compiler
compiles
cljs->js
compiles
js->optimized-js

4. Setting up Leiningen

5. Setting up Leinigen (cont'd)

6. Hello, World!

7. Building

8. Read Eval Print Loop demo

9. REPL
starts
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

10. Parsing ars - clj.tools.cli

11. Parsing args (cont'd)

12. Interop with Node.js libraries
compiles into

13. Callbacks

14. core.async for callbacks
georgewsinger/cljs-callback-heaven/blob/master/src/cljs_callback

15. core.async for callbacks
(cont'd)
https://github.com/mailhog/MailHog

16. core.async for promises

17. 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