Clojure

Like many other clojurians, my clojure journey started with this presentation by Rich Hickey: Simple Made Easy.

Get started

most easy way is using Leiningen, after installed lein

first thing to learn is how to get help:

(pprint (loaded-libs)) to get currently loaded namespaces
use dir to get list of available functions, for example (dir clojure.string), ns-publics to get the mapping
use doc to get more info, (doc clojure.string/replace)
use source to show source code, (source clojure.string/replace)
use find-doc to search, accepts a regexp, (find-doc #"javadoc")

(above functions are under clojure.repl namespace)

to show methods of an java object:

(map str (vec (.getMethods (.getClass theJavaObject))))

check this repo for clojure style guide: bbatsov/clojure-style-guide · GitHub

you can also find best practices for the very confusing ns form: :require, :import, :use, :refer

emacs with cider of course.

for quick start Light Table is great.

IDE style may try IntelliJ with JetBrains/la-clojure.

run any class inside a jar

java -cp my-standalone.jar clojure.main -m my.class

quick reference

documentation

library directory

news

exercise

books

Clojure for the brave and true is a good place to start with.