Clojure - Programming language

Clojure is an open source programming language created in 2007 by Rich Hickey.

#27on PLDB

17Years Old

82kRepos

Download source code:

git clone https://github.com/clojure/clojure

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Clojure ( , like "closure") is a dialect of the Lisp programming language. Clojure is a general-purpose programming language with an emphasis on functional programming. It runs on the Java virtual machine and the Common Language Runtime. Read more on Wikipedia...

Tags: programming language, lisp
Clojure is developed on GitHub and has 10,392 stars
Watch the history of the Clojure repo visualized with Gource
There are at least 82,125 Clojure repos on GitHub
Early development of Clojure happened in Cognitect
Clojure is written in Java, Clojure, Markdown, YAML, HTML, XML, Bourne shell
The Google BigQuery Public Dataset GitHub snapshot shows 14k users using Clojure in 26k repos on GitHub
Check out the 378 Clojure meetup groups on Meetup.com.
There are 29,258 members in the Clojure subreddit
There are 1,655 Project Euler users using Clojure
In the 2021 StackOverflow developer survey Clojure programmers reported a median salary of $95,000. 2% of respondents reported using Clojure. 1,552 programmers reported using Clojure, and 2,413 said they wanted to use it
Explore Clojure snippets on Rosetta Code
Clojure ranks #42 in the TIOBE Index
Clojure Ubuntu package
ANTLR grammar for Clojure
Clojure LSP implementation
CodeMirror package for syntax highlighting Clojure
Monaco package for syntax highlighting Clojure
Pygments supports syntax highlighting for Clojure
GitHub supports syntax highlighting for Clojure
Clojure appears in the Quine Relay project
Learn Clojure on exercism.
PLDB has 2 Jupyter Kernels for Clojure: github.com, github.com
There is a central package repository for Clojure
Events page for Clojure
Indeed.com has 355 matches for "clojure engineer".
clojure.org was registered in 2005
See also: (20 related languages) JVM, C#, Common Lisp, Erlang, Haskell, Mathematica, ML, Prolog, Scheme, Java, Racket, Ruby, Elixir, Lisp, Apache Maven, S-expressions, CSP, ActionScript, Python, Unicode
Read more about Clojure on the web: 1.
22 PLDB concepts link to Clojure: Ace Editor, Clojure, ClojureScript, datascript, Felix, femtolisp, fleck, Flow9, F*, hasklig, Insitux, Jank, Julia, Linux, Lux, mal, multiaddr, Opal, OpenCV, Pan, Pygments, wah

Example from Riju:

(println "Hello, world!")

Example from hello-world:

(println "Hello World")

Example from the Hello World Collection:

; Hello world in Clojure

(defn hello []
  (println "Hello world!"))

(hello)

Example from Linguist:

(defn rand
  "Returns a random floating point number between 0 (inclusive) and
  n (default 1) (exclusive)."
  ([] (scm* [n] (random-real)))
  ([n] (* (rand) n)))

Example from Wikipedia:

;; A typical entry point of a Clojure program:
;;   `-main` function
(defn -main ; name
  [& args] ; (variable) parameters
  (println "Hello, World!")) ; body

Language features

Feature	Supported	Example	Token
Standard Library	✓	(println "Hello, World!")
Integers	✓	; -?\d+
Floats	✓	; -?\d+\.\d+
Hexadecimals	✓	; 0x-?[abcdef\d]+
MultiLine Comments	✓	(comment A comment )	(comment )
Print() Debugging	✓		println
Garbage Collection	✓
Dynamic Typing	✓
Homoiconicity	✓
Line Comments	✓	; A comment	;
Operator Overloading	✓
Macros	✓	; https://www.braveclojure.com/writing-macros/ ; https://clojure.org/reference/macros (defmacro and "Evaluates exprs one at a time, from left to right. If a form returns logical false (nil or false), and returns that value and doesn't evaluate any of the other expressions, otherwise it returns the value of the last expr. (and) returns true." {:added "1.0"} ([] true) ([x] x) ([x & next] `(let [and# ~x] (if and# (and ~@next) and#))))
File Imports	✓	(load "fun") (load "files/fun") (load-file "./files/fun.clj") (defproject project-a :dependencies [[org.clojure/clojure "1.5.1"] [project-b "0.1.0"]]) (require '[clojure.string :as string]) (use '[clojure.string :only [split]]) (import 'java.util.Date) (java.util.Date.) (require 'clojure.contrib.def 'clojure.contrib.except 'clojure.contrib.sql) (require '(clojure.contrib def except sql))
Comments	✓
Partial Application	✓	(defn fun-full [x y] (+ x y)) (fun-full 2 3) (def fun-half (partial fun-full 2)) (fun-half 3)
Strings	✓	"hello world"	"
Case Insensitive Identifiers	X
Semantic Indentation	X