How to run a clojure file/script using leiningen

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If you’re taking your first steps in the clojure world and just want to try out some commands. Assuming you are using leiningen and have already created a project using lein new, you have two options:

1. Fire a REPL

That’s easy:

$ lein repl

The downside of this option is that lein, AFAIK, doesn’t allow us to save the session contents to a file.

2. Run a script

This is useful specially when you want to have access to the code in a later coding session. This can be achieved in three steps.

2.1 create the file under the src folder. For example: src/joyofclojure/xor.clj.

2.2 Declare a namespace for the file:

(ns joyofclojure.xor)

2.3 define a main function, just like you’d do in java, which will serve as your script’s entry point:

(defn -main [] ... )

That’s it, now you can run you code via:

$ lein run -m joyofclojure.xor