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What is the ns-map method in Clojure?

Chinweuba Elijah Azubuike

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

Namespaces in Clojure are used to distinguish classes into separate logical parts. They're used when we have multiple imported classes in our code. The ns-map method is one of the methods used to work with namespaces.

The ns-map method

The ns-map method is used to return the integer value of all the mappings of a namespace.

Syntax

(ns-map nameof-namespace)
Syntax for the ns-map method

Parameter

This method takes the parameter, nameof-namespace, which represents the name of the namespace.

Return value

This method returns a map containing all the mappings associated with a namespace.

Example

(ns clojure.examples.example
(:gen-class))
(defn func []
(println (ns-map 'clojure.core))
(println (count (ns-map 'clojure.core))))
(func)
Example of the ns-map method

Explanation

  • Line 3: We define a function, func.
  • Line 4: We use the ns-map method and print the output. Notice that the output is a map containing the mappings of the namespace we passed to the ns-map method.

Note: When we say mappings, we mean a map of the maps. This means that the output is a map, and that the map contains a series of maps.

  • Line 5: We count the number of maps returned by the ns-map method.
  • Line 6: We call the function, func.

RELATED TAGS

ns-map
clojure
communitycreator

CONTRIBUTOR

Chinweuba Elijah Azubuike

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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