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{{Distinguish|ARC Macro Language}}
{{Infobox programming language
| name = Arc
| logo = <!-- Filename only -->
| logo caption =
| screenshot = <!-- Filename only -->
| screenshot caption =
| paradigms = [[Multi-paradigm programming language|Multi-paradigm]]: [[Functional programming|functional]], [[Metaprogramming|meta]], [[Procedural programming|procedural]]
| family = [[Lisp (programming language)|Lisp]]
| designer = [[Paul Graham (programmer)|Paul Graham]]
| developers = Paul Graham, Robert Morris,<br />Arc [[Community of practice|community]]
| released = {{Start date and age|2008|01|29|df=yes}}
| latest release version = 3.2
| latest release date = {{Start date and age|2018|10|28|df=yes}}<ref>{{cite web |url=http://arclanguage.org/item?id=20772 |title=Arc Forum: Tell Arc: Arc 3.2 |website=Arclanguage.org |access-date=2018-11-07}}</ref>
| latest preview version =
| latest preview date = <!-- {{Start date and age|201Y|MM|DD|df=yes}} -->
| typing = [[Dynamic typing|Dynamic]]
| scope =
| programming language = [[Racket (programming language)|Racket]], [[Common Lisp (programming language)|Common Lisp]]
| platform = [[IA-32]], [[x86-64]]
| operating system = [[Linux]]
| license = [[Artistic License]] 2.0
| file ext = .arc
| file format = <!-- or: | file formats = -->
| website = {{URL|arclanguage.org}}
| implementations = Arc, Anarki, Arcadia, Rainbow
| dialects =
| influenced by = [[Lisp (programming language)|Lisp]], [[Scheme (programming language)|Scheme]]
| influenced =
}}
'''Arc''' is a [[programming language]], a [[Dialect (computing)|dialect]] of the language [[Lisp (programming language)|Lisp]], developed by [[Paul Graham (programmer)|Paul Graham]] and [[Robert Tappan Morris|Robert Morris]]. It is [[free and open-source software]] released under the [[Artistic License]] 2.0.
In 2001, Paul Graham [http://www.paulgraham.com/arcll1.html announced] that he was working on a new dialect of Lisp named "Arc." Over the years since, he has written several essays describing features or goals of the language, and some internal projects at Y Combinator have been written in Arc, most notably the [http://news.ycombinator.com Hacker News] web forum and news aggregator program.▼
== History ==
In the essay [http://www.paulgraham.com/popular.html Being Popular] Graham describes a few of his goals for the language. While many of the goals are very general ("Arc should be hackable," "there should be good [[Library (computing)|libraries]]"), he did give some specifics. For instance, he believes that it is important for a language to be terse:▼
▲In 2001, Paul Graham
<blockquote> It would not be far from the truth to say that a hacker about to write a program decides what language to use, at least subconsciously, based on the total number of characters he'll have to type. If this isn't precisely how hackers think, a language designer would do well to act as if it were. </blockquote>▼
==Motives==
He also stated that it is better for a language to only implement a small number of "axioms," even when that means the language may not have features that large organizations want, such as [[Object-oriented programming|object-orientation]]. In fact, Graham feels that object-orientation is not useful as OO methods and patterns are just "good design," and he sees the language features used to implement OO as partially mistaken.<ref>[http://www.paulgraham.com/noop.html Why Arc Isn't Especially Object-Oriented]</ref><ref>[http://www.paulgraham.com/arcfaq.html Arc FAQ]</ref>▼
▲In the essay
▲
▲He also stated that it is better for a language to only implement a small number of
A controversy among Lisp programmers is if, and how much, the [[S-expressions]] of the language should be complemented by other forms of [[syntax]]. Graham feels that additional syntax should be used in situations where pure S-expressions would be overly verbose, saying, "I don't think we should be religiously opposed to introducing syntax into Lisp." Graham also feels that efficiency problems should be solved by giving the programmer a good [[Performance analysis|profiler]].▼
▲A controversy among Lisp programmers is
=== Reception ===
When released in 2008, Arc generated mixed reactions, with some calling it simply an extension to Lisp or [[Scheme (programming language)|Scheme]] and not a programming language in its own right. Others applauded Arc for stripping Lisp down to bare essentials. Shortly after its release, Arc was ported to [[JavaScript]], and was being supported by ''Schemescript'', an [[integrated development environment]] (IDE) based on [[Eclipse (software)|Eclipse]].<ref>{{cite web |url=https://www.theregister.co.uk/2008/02/07/lisp_arc_challenge/ |title=Web pioneer hits critics with Lisp gauntlet |website=The Register |date=2008-02-07 |place=[[United Kingdom|UK]]}}</ref>
== Examples ==
[["Hello, World!" program|Hello world]] in Arc :
<syntaxhighlight lang="lisp">
(prn "Hello, World")
</syntaxhighlight>
To illustrate Arc's terseness, Graham uses a brief program. It produces a form with one field at the url "/said". When the form is submitted, it leads to a page with a link that says "click here", which then leads to a page with the value of the original input field.<ref>{{cite web |url=http://www.paulgraham.com/arcchallenge.html |title=Take the Arc Challenge |last=Graham |first=Paul |date=February 2008 |website=PaulGraham.com |access-date=2018-12-05}}</ref>
<syntaxhighlight lang="lisp">
(defop said req
(aform [onlink "click here" (pr "you said: " (arg _ "foo"))]
(input "foo")
(submit)))
</syntaxhighlight>
==Versions==
===Official version===
The first publicly released version of Arc was made available on 29 January 2008,<ref>{{cite web |url=http://www.paulgraham.com/arc0.html |title=Arc's Out |last=Graham |first=Paul |date=29 January 2008 |website=PaulGraham.com |access-date=2018-12-05}}</ref> implemented on [[Racket (programming language)|Racket]] (named PLT-Scheme then). The release comes in the form of a [[Tar (computing)|.tar]] archive, containing the Racket [[source code]] for Arc. A tutorial<ref>{{cite web |url=http://www.arclanguage.org/tut.txt |title=Arc Tutorial |author=<!-- Unstated. --> |date=<!-- Unstated. --> |website=Paul Graham |access-date=2018-12-05}}.</ref> and a discussion forum<ref>{{cite web |url=http://arclanguage.org/forum |title=Arc Forum |website=Arc language}}</ref> are also available. The forum uses the same program that [[Hacker News]] does, and is written in Arc.{{citation needed|date=June 2025}}
=== Unofficial versions ===
Due to lack of updates in the official Arc branch, some members of the Arc [[Community of practice|community]] started their own repositories with unofficial modifications, extensions, and libraries. One version, ''Anarki'',<ref>{{cite web |url=https://github.com/arclanguage/anarki |title=Anarki |last=Rapp |first=Kenneth (kennethrapp) |date=14 November 2018 |website=GitHub |access-date=2018-12-05}}</ref> permitted<ref>{{cite web |url=http://arclanguage.org/item?id=17707 |title=Announcement: anarki is no longer world-committable |last=Agaram |first=Kartik (akkartik) |date=27 May 2013 |website=Arc Forum |publisher=Arc language |access-date=2018-12-05}}</ref> anyone to submit changes to the project and has a community managed wiki.<ref>{{cite web |url=https://sites.google.com/site/arclanguagewiki |title=Arc Lang Wiki |author=<!-- Unstated. --> |date=<!-- Unstated. --> |website=Sites |access-date=2018-12-05}}</ref>
''Rainbow''<ref>{{cite web |url=https://github.com/conanite/rainbow |title=Rainbow |last=Dalton |first=Conan (conanite) |date=12 October 2010 |website=GitHub |access-date=2018-12-05}}</ref> is an implementation of Arc in [[Java (programming language)|Java]].
''Arcadia''<ref>{{cite web |url=https://github.com/kimtg/Arcadia |title=Arcadia |last=Kim |first=Taegyoon (kimtg) |date=19 August 2018 |website=GitHub |access-date=2018-12-05}}</ref> is an implementation of Arc in [[C (programming language)|C]].
''Arc++''<ref>{{cite web |url=https://github.com/kimtg/Arcpp |title=Arcpp |last=Kim |first=Taegyoon (kimtg) |date=13 August 2023 |website=GitHub |access-date=2023-08-13}}</ref> is an implementation of Arc in [[C++]].
===Timeline of LISP Dialects===
{{Lisp}}
==References==
{{Reflist|64em}}
==External links==
*{{Official website|arclanguage.org}}
*
*{{GitHub|arclanguage/anarki|Anarki}}
{{Lisp programming language}}
[[Category:Dynamically
[[Category:Functional languages]]
[[Category:Lisp programming language family]]
[[Category:Cross-platform free software]]
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