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What is the conj method in a Clojure sequence?

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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What is a sequence?

A sequence is a data storage structure that holds a collection of data objects. In Clojure, the seq method builds a sequence.

The conj method in a Clojure sequence

The conj sequence method adds a data item to the beginning of a list and returns the list with the added data item(s).

Syntax

(conj seqq elementseqq)
The conj sequence syntax

Parameters

This method takes the following parameters:

  • seqq: This represents the sequence of items.
  • elementseqq: This represents the data items to be added.

Return value

This method returns a sequence with newly added elements.

Example

(ns clojure.examples.example
(:gen-class))
(defn AddConj []
(println (conj (seq [1 23,35]) 97 50)))
(AddConj)
An example of the conj method in a Clojure sequence

Explanation

  • Line 3: We define a function AddConj, which adds elements in the sequence using the conj method.
  • Line 4: We use the conj to add data items, 97 and 50, to the beginning of the list. Next, we use println to print the list.
  • Line 5: We call the AddConj function.

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clojure sequence
conj method
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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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