/cadr

Implementing car, cdr, cadr, ..., cddddr in Clojure

Primary LanguageClojure

README

Implementation

Let’s implement c[ad]{1,4}r (i.e. { car, cdr, cadr, …, cddddr }) in Clojure; according to the following composition table:

(caar l)   -> (car (car l))
(cadr l)   -> (car (cdr l))
(cdar l)   -> (cdr (car l))
(cddr l)   -> (cdr (cdr l))
(caaar l)  -> (car (car (car l)))
(caadr l)  -> (car (car (cdr l)))
(cadar l)  -> (car (cdr (car l)))
(caddr l)  -> (car (cdr (cdr l)))
(cdaar l)  -> (cdr (car (car l)))
(cdadr l)  -> (cdr (car (cdr l)))
(cddar l)  -> (cdr (cdr (car l)))
(cdddr l)  -> (cdr (cdr (cdr l)))
(caaaar l) -> (car (car (car (car l))))
(caaadr l) -> (car (car (car (cdr l))))
(caadar l) -> (car (car (cdr (car l))))
(caaddr l) -> (car (car (cdr (cdr l))))
(cadaar l) -> (car (cdr (car (car l))))
(cadadr l) -> (car (cdr (car (cdr l))))
(caddar l) -> (car (cdr (cdr (car l))))
(cadddr l) -> (car (cdr (cdr (cdr l))))
(cdaaar l) -> (cdr (car (car (car l))))
(cdaadr l) -> (cdr (car (car (cdr l))))
(cdadar l) -> (cdr (car (cdr (car l))))
(cdaddr l) -> (cdr (car (cdr (cdr l))))
(cddaar l) -> (cdr (cdr (car (car l))))
(cddadr l) -> (cdr (cdr (car (cdr l))))
(cdddar l) -> (cdr (cdr (cdr (car l))))
(cddddr l) -> (cdr (cdr (cdr (cdr l))))

Installation

See Clojars; in Leiningen, add the following to your dependencies in project.clj:

[cadr "1.0.2-SNAPSHOT"]

or in Maven, to your pom.xml:

<dependency>
  <groupId>cadr</groupId>
  <artifactId>cadr</artifactId>
  <version>1.0.1-SNAPSHOT</version>
</dependency>

Usage

In your namespace, for instance, issue:

(:use [cadr])