How to Debug ClojureScript

Question

I apologize for this seemingly stupid question, but I\'ve been playing with ClojureScript on and off for a few weeks now, and I can\'t figure out this one simple question:

Answer 1

I'm using piggieback and connect my brepl(browser repl) to my nrepl.

This way, you can test your cljs code on your nrepl instance to get quicker feedback. You can even execute some cljs scripts within nrepl that makes changes to dom. As for state of variables, I use (js/console.log variable) like Hendekagon mentioned. Also, as dnolen has pointed out, if you compile with debug mode (:optimization :whitespace), then generated javascript becomes easier to understand, so I do breakpoints on chrome js environment.

[added:2013-07-18] adding brief steps to setup nrepl-brepl

1. I setup brepl environment with help of below tutorial. https://github.com/magomimmo/modern-cljs/blob/master/doc/tutorial-02.md

   in short, you'll need below snippet somewhere in your clojurescript code.

   (repl/connect "http://localhost:9000/repl")
   

2. then open nrepl in emacs(I'm using M-x nrepl-jack-in)

3. Enter below in your nrepl

   (do
    (require 'cljs.repl.browser)
    (cemerick.piggieback/cljs-repl
      :repl-env
      (doto (cljs.repl.browser/repl-env :port 9000)
        cljs.repl/-setup)))
   

4. You need to show the page that has your cljs running on your browser.

5. test if your nrepl is working correctly by executing below on nrepl. (js/alert "I'm ready!")