Clean

Clean is a programming language created in 1987.

#231on PLDB	36Years Old	481Users
9Books	5Papers	206Repos

Try now: Riju · TIO

Clean is a general-purpose purely functional computer programming language. For much of the language's active development history it was called Concurrent Clean, but this was dropped at some point.. Read more on Wikipedia...

Clean website
Clean Wikipedia page
Clean docs
There are at least 206 Clean repos on GitHub
Clean first developed in Radboud University Nijmegen
file extensions for Clean include icl, dcl, abc and sapl
The Google BigQuery Public Dataset GitHub snapshot shows 231 users using Clean in 263 repos on GitHub
Explore Clean snippets on Rosetta Code
Clean on HOPL
Clean appears in the TIOBE Index
Pygments supports syntax highlighting for Clean
GitHub supports syntax highlighting for Clean
See also: (7 related languages)Miranda, Haskell, C, Solaris, Linux, Fibonacci, Prolog
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Example from Compiler Explorer:

module example

import StdInt

square :: Int -> Int
square n = n * n

Start :: Int
Start = square 3

Example from Riju:

module main

import StdEnv

Start world
  #(console, world) = stdio world
  #console = fwrites "Hello, world!\n" console
  #(ok, world) = fclose console world
  = world

Example from hello-world:

module hello
Start :: {#Char}
Start = "Hello World"

Example from the Hello World Collection:

// Hello World in Clean

module hello

Start :: String
Start = "Hello World!\n"

Example from Linguist:

definition module GenMap

import StdGeneric

generic gMap a b :: .a -> .b
derive gMap c, UNIT, PAIR, EITHER, CONS, FIELD, OBJECT, {}, {!} 

derive gMap [], (,), (,,),  (,,,), (,,,,), (,,,,,), (,,,,,,), (,,,,,,,)

Example from Wikipedia:

(^) infixr 8 :: Int Int -> Int
  (^) x 0 = 1
  (^) x n = x * x ^ (n-1)

Keywords in Clean

case ccall class code code inline derive export foreign generic if in infix infixl infixr instance let of otherwise special stdcall where with

Feature	Supported	Token	Example
Conditionals	✓
Classes	✓
Strings	✓	"	"Hello world"
Line Comments	✓	//	// A comment
Comments	✓
Semantic Indentation	X

title	authors	year	publisher
The Clean Coder: A Code of Conduct for Professional Programmers	Martin, Robert	2011	Pearson
Beyond the Basic Stuff with Python: Best Practices for Writing Clean Code	Sweigart, Al	2020	No Starch Press
Clean Architecture: A Craftsman's Guide to Software Structure and Design (Robert C. Martin Series)	C., Martin Robert	2017	Pearson
Reactive Programming with Swift 4: Build asynchronous reactive applications with easy-to-maintain and clean code using RxSwift and Xcode 9	Singh, Navdeep	2018	Packt Publishing
Clean Code in Python: Refactor your legacy code base	Anaya, Mariano	2018	Packt Publishing
Beyond the Basic Stuff with Python: Best Practices for Writing Clean Code	Sweigart, Al	2020	No Starch Press
Clean Agile: Back to Basics (Robert C. Martin Series)	C., Martin Robert	2019	Pearson
Clean Code in Python: Develop maintainable and efficient code, 2nd Edition	Anaya, Mariano	2021	Packt Publishing
Clean Craftsmanship: Disciplines, Standards, and Ethics (Robert C. Martin Series)	Martin, Robert C.	2021	Addison-Wesley Professional

Publications about Clean from Semantic Scholar

title	authors	year	citations	influentialCitations
The ins and outs of Clean I/O	P. Achten and M. J. Plasmeijer	1995	90	8
Interactive Functional Objects in Clean	P. Achten and M. J. Plasmeijer	1997	44	2
Clean Translation of an Imperative Reversible Programming Language	Holger Bock Axelsen	2011	31	2
Luandri: A Clean Lua Interface to the Indri Search Engine	Bhaskar Mitra and Fernando Diaz and Nick Craswell	2017	5	0
Exchanging sources between clean and Haskell: a double-edged front end for the clean compiler	John H. G. van Groningen and T. V. Noort and P. Achten and P. Koopman and M. J. Plasmeijer	2010	4	0

Clean - Programming language

Keywords in Clean

Language features

Books about Clean from ISBNdb

Publications about Clean from Semantic Scholar