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. |
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