Experimenting with Clojure has been a fun process. Just to show how easy it is, let's walk through the process of booting your first little web app. This is 100% OS X specific…
$ brew install clojure
It's that easy. Also, use homebrew.
Leiningen is a helpful automated project build tool for clojure projects. To install, download the script, make it executable, and place it in your path. It seems to be somewhat analagous to Bundler in the Ruby world.
Full instructions are here: Leiningen Github Page
Start Your Engines
Let's get our project bootstrapped…
$ cd ~/dev
$ lein new myfirstwebapp
$ cd myfirstwebapp/
Open the project.clj file inside of your app directory and add a few dependencies.
$ lein deps
…to install the necessary dependencies. You can see that we're depending on Ring, which is an HTTP abstraction library in clojure. It is analagous to Rack.
The Hello World
Let's add a Ring request handler that simply handles all requests with a 200 "Hello World!" html response.
To boot your app and have it automatically opened in a browser, run…
$ lein ring server
None of this is to say that Clojure, or other Lisp-y/functional languages, are easy, but that it is FAST to get started with a simple web app. Give it a try.