🥷 Clojure Pro Tip 4: Cider ClojureDocs

 Posted on 2025-04-29  (Last modified on 2025-05-17)  |  1 minutes  |  82 words

Sometimes, we may want a few examples of a Clojure API for inspiration while developing, especially when reading other people's or open source code. With Cider in Emacs, we can run M-x cider-doc to see the docstring for the symbol. We can even use M-x cider-clojuredocs for some examples if the symbol is from the language core. Running M-x cider-clojuredocs I happened to find this command recently. I bet I was not the only one who didn't know it, thus I'm sharing. [Read More]
Clojure  Cider  Emacs  tweet 

Getting Started with Cider for Clojure Programming

 Posted on 2024-12-22  |  2 minutes  |  303 words

Here is the outline for my cider tutorial on YouTube, covering basic things you need to know to get started with cider, and starting exploring the fun of clojure programming with the REPL-driven programming approach. Jack In to a REPL C-c M-j (cider-jack-in-clj) start a nREPL and jack in. It works in a project or with a sole .clj file. M-x cider-connect-clj run the command and then fill in hostname and port. [Read More]
clojure  cider  emacs 

A Few Quick Notes About babashka/fs

 Posted on 2024-12-07  (Last modified on 2024-12-19)  |  1 minutes  |  149 words

Recently I've used babashka/fs a little bit, here are some quick notes for it: Path vs File. Use Path whenever possible, according to this SO answer to "Java: Path vs File". This is actually Java related. It's ok to use a path as a key for a clojure map. At my first try, I somehow came to the conclusion that it's not ok, while I was refactoring the live reload for clay. [Read More]
clojure  cider  clay  python  tweet 

Doing Unit test in Clojure Is Easy

 Posted on 2024-11-28  (Last modified on 2025-02-26)  |  1 minutes  |  165 words

While refactoring the live reload feature of Clay, I realized I'd better break long functions into smaller and functional ones (as many as I can), which is also a common practice in the clojure community. Small pure functions not only are easy to verify on the development process (using a REPL), but also are easy to test. And unit tests are easy to write in clojure, just use deftest from clojure. [Read More]
clojure  cider  clay  tweet 

Starting a Clojure nREPL Manually for Cider

 Posted on 2024-11-08  (Last modified on 2025-02-18)  |  1 minutes  |  174 words

While troubleshooting and fixing a live reload bug in Clay today, which required to start a minimal Clojure environment, I figured out how to start a nREPL from the command line. Instead of using M-x cider-jack-in-clj directly from Emacs, actually we can manully bring up an nREPL with this: clj -Sdeps "{:deps {org.scicloj/clay {:mvn/version \"2-beta21\"} cider/cider-nrepl {:mvn/version \"0.50.2\"}}}" -m nrepl.cmdline --middleware "[cider.nrepl/cider-middleware]" (The clay part is only necessary for this debugging), and then connect to this nREPL using the Emacs command M-x cider-connect-clj. [Read More]
Cider  Clojure  Tweet