Clojure - Namespaces

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Namespaces in Clojure are used to differentiate classes into separate logical spaces just like in Java. Consider the following statement.

(:require [clojure.set :as set])

In the above statement, ‘clojure.set’ is a namespace which contains various classes and methods to be used in the program. For example, the above namespace contains the function called map-invert, which is used to invert a map of key-values. We cannot use this function unless we explicitly tell our program to include this namespace.

Let’s look at the different methods available for namespaces.

Sr.No.	Methods & Description
1	*ns* This is used to look at your current namespace.
2	ns This is used to create a new namespace and associate it with the running program.
3	alias Add an alias in the current namespace to another namespace. Arguments are two symbols: the alias to be used and the symbolic name of the target namespace.
4	all-ns Returns a list of all namespaces.
5	find-ns Finds and returns a particular namespace.
6	ns-name Returns the name of a particular namespace.
7	ns-aliases Returns the aliases, which are associated with any namespaces.
8	ns-map Returns a map of all the mappings for the namespace.
9	un-alias Returns a map containing only those entries in map whose key is in keys.