Q:

How can I define something belonging to another namespace in clojure?

I have a clj file using a certain namespace and I wish to define something belonging to another namespace, so I do :
(def  other.namespace/name-of-something "value")

: but when I do this I get the result :
java.lang.Exception: Can't refer to qualified var that doesn't exist

Does anyone know why?

A:

First, you'll need to ensure that the namespace exists via a call to create-ns:
(create-ns 'other.namespace)

Then, you can use the intern function to add definitions to that namespace:
(intern 'other.namespace 'name-of-something "value")

You can confirm this is present with a call to (ns-interns 'other.namespace).

