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{{AFC submission|t||ts=20180605190000|u=Milotheshort|ns=118|demo=}}
<!-- {{AfC submission|t||ts=20221122223018|u=Ferdinand55|ns=118|demo=}} -->

<!-- Note: The following pages were redirects to [[Pony_(programming_language)]] before draftification:
⚫
*[[Pony (programming Language)]]
-->

{{Infobox programming language
{{Infobox programming language
| name = Pony
| name = Pony
| logo = <!-- (filename) -->
| logo = Main-galloping.svg
| paradigm = [[Actor model]], [[object-oriented programming|Object-oriented]], [[Imperative programming|Imperative]]
| logo caption =
⚫
| designer = Sylvan Clebsch
| screenshot = <!-- (filename) -->
⚫
| influenced by = [[E (programming language)|E]]
| screenshot caption =
| influenced = {{URL|https://www.gitbook.com/book/stw/the-encore-programming-language/details|Encore}}, [[Project Verona]]<ref>{{cite web |title=Verona FAQ |url=https://github.com/microsoft/verona/blob/master/docs/faq.md |website=Github}}</ref>, [https://github.com/savi-lang/savi Savi], [https://inko-lang.org/ Inko]
| paradigm = <!-- or: | paradigms = -->
| latest_release_version = 0.58.5
| family =
| latest_release_date = {{start date and age|2024|06|01}}
⚫
| designer = [[Sylvan Clebsch]]
| typing = [[strong typing|strong]], [[static typing|static]], [[type inference|inferred]], [[nominal typing|nominal]], [[structural typing|structural]]
| developer = <!-- or: | developers = -->
| website = {{URL|http://www.ponylang.org}}
| released = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| latest release version =
| year = {{release date and age|2012|11|09}}
| license = [[BSD licenses|BSD]]-2.<ref>https://github.com/ponylang/ponyc/blob/master/LICENSE</ref>
| latest release date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| programming_language = [[C (programming language)|C]]
| latest preview version =
| latest preview date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| typing =
| scope =
⚫
| programming language =
| discontinued =
| platform =
| operating system =
| license =
| file ext =
| file format = <!-- or: | file formats = -->
| website = <!-- {{url|www.example.com}} -->
| implementations = [[Ponylang]] [[Ponyc]]
| dialects =
⚫
| influenced by = [[Erlang (programming language)|Erlang]], [[Rust (programming language)|Rust]]
| influenced =
}}
}}


'''Pony''' is an open-source, object-oriented, actor-model, capabilities-secure, high-performance programming language.The actor model is particularly borrowed extensively from Erlang. The stated goals of pony are to provide concurrency protection by creating restriction keys.
'''Pony''' (sometimes referred to as '''ponylang''') is a [[Free software|free]] and [[open-source|open source]], object-oriented, [[actor model]], capabilities-secure, high performance programming language. Pony's reference capabilities allow even mutable data to be safely passed ''by reference'' between actors. Garbage collection is performed concurrently, per-actor, without the need to "stop the world".

==Language design==
At its core, Pony is a systems language designed around safety and performance.
=== Safety ===
* Type Safety - Pony is a type safe language.<ref>https://www.ponylang.org/media/papers/fast-cheap.pdf</ref>
* Memory Safety - There are no dangling pointers and no buffer overruns. There is no null but optional types can be safely represented using unions with the None type.
* Exception Safety - There are no runtime exceptions. All exceptions have defined semantics and they are always caught.
* Concurrency Safety - The type system employs reference capabilities<ref>{{cite conference
| author = Sylvan Clebsch, Sophia Drossopoulou, Sebastian Blessing, Andy McNeil
| title = Deny capabilities for safe, fast actors
| book-title = AGERE! 2015: Proceedings of the 5th International Workshop on Programming Based on Actors, Agents, and Decentralized Control
| date = October 2015
| pages = 1-12
| publisher = Association for Computing Machinery
| location = Pittsburgh, PA, USA
| isbn = 9781450339018
| doi = 10.1145/2824815.2824816
| editor = Elisa Gonzalez Boix, Philipp Haller, Alessandro Ricci, Carlos Varela
}}</ref> to ensure (at compile time) that your program is free of data races and deadlocks.
=== Performance ===
* Lock-Free - By design, Pony avoids the need for traditional locking mechanisms, which eliminates the overhead and contention associated with locks.
* Native Code - Pony is an ahead-of-time (AOT) compiled language. There is no interpreter or virtual machine
* Concurrent Garbage Collection - Each actor's heap is collected separately and concurrently, avoiding the need to "stop the world" for global collection.

==Examples==
A few examples of idiomatic Pony follow.

===Hello World===
In Pony, instead of a main function, there is a main '''''actor'''''. The creation of this actor serves as the entry point into the Pony program.

<syntaxhighlight lang="pony">
actor Main
new create(env: Env) =>
env.out.print("Hello, world!")
</syntaxhighlight>

There are no global variables in Pony, everything must be contained within an instance of a class or an actor. As such, even the environment that allows for printing to '''stdout''' is passed as a parameter.

==References==
{{Reflist}}

== External links ==


* [http://www.ponylang.org Offical website]
<ref>{{cite web |url=https://www.ponylang.org/discover/#what-is-pony |title=What is Pony? |accessdate=5 June 2018}}</ref>
* [https://medium.com/@KevinHoffman/composition-over-inheritance-in-pony-33bbe107914 Composition over Inheritance with Pony]
<ref>{{cite web |url=https://opensource.com/article/18/5/pony?utm_medium=Email&utm_campaign=weekly&sc_cid=701f2000000RRACAA4 |title=Introduction to the Pony Programming Language |accessdate=5 June 2018}}</ref>
* [https://qconlondon.com/ln2017/presentation/pony-co-designing-type-system-and-run-time QCon London: Co-Designing a Type System and Runtime]
⚫
<ref>{{cite web |url=https://www.infoq.com/news/2016/03/pony-fintech |title=Using the Actor-model Language Pony for FinTech |accessdate=5 June 2018}}</ref>
* [https://www.infoq.com/interviews/clebsch-pony InfoQ Interview: Sylvan Clebsch on the Actor-Model Language Pony, Garbage Collection, Capabilities, Concurrency]
* [https://c7.se/from-go-to-pony/ From Go to Pony]
⚫
* [https://www.infoq.com/news/2016/03/pony-fintech InfoQ: Using the Actor-model Language Pony for FinTech]
* [https://www.youtube.com/watch?v=KvLjy8w1G_U Pony: Making it easy to write efficient, concurrent, data race free programs] at [http://curry-on.org/2015/sessions/pony-making-it-easier-to-write-efficient-concurrent-programs.html Curry On 2015] associated with [[ECOOP]] [http://2015.ecoop.org/ 2015]

Latest revision as of 01:36, 21 June 2024


Pony
ParadigmActor model, Object-oriented, Imperative
Designed bySylvan Clebsch
First appearedNovember 9, 2012; 12 years ago (2012-11-09)
Stable release
0.58.5 / June 1, 2024; 6 months ago (2024-06-01)
Typing disciplinestrong, static, inferred, nominal, structural
Implementation languageC
LicenseBSD-2.[1]
Websitewww.ponylang.org
Influenced by
E
Influenced
Encore, Project Verona[2], Savi, Inko

Pony (sometimes referred to as ponylang) is a free and open source, object-oriented, actor model, capabilities-secure, high performance programming language. Pony's reference capabilities allow even mutable data to be safely passed by reference between actors. Garbage collection is performed concurrently, per-actor, without the need to "stop the world".

Language design

[edit]

At its core, Pony is a systems language designed around safety and performance.

Safety

[edit]
  • Type Safety - Pony is a type safe language.[3]
  • Memory Safety - There are no dangling pointers and no buffer overruns. There is no null but optional types can be safely represented using unions with the None type.
  • Exception Safety - There are no runtime exceptions. All exceptions have defined semantics and they are always caught.
  • Concurrency Safety - The type system employs reference capabilities[4] to ensure (at compile time) that your program is free of data races and deadlocks.

Performance

[edit]
  • Lock-Free - By design, Pony avoids the need for traditional locking mechanisms, which eliminates the overhead and contention associated with locks.
  • Native Code - Pony is an ahead-of-time (AOT) compiled language. There is no interpreter or virtual machine
  • Concurrent Garbage Collection - Each actor's heap is collected separately and concurrently, avoiding the need to "stop the world" for global collection.

Examples

[edit]

A few examples of idiomatic Pony follow.

Hello World

[edit]

In Pony, instead of a main function, there is a main actor. The creation of this actor serves as the entry point into the Pony program. 

actor Main
  new create(env: Env) =>
    env.out.print("Hello, world!")

There are no global variables in Pony, everything must be contained within an instance of a class or an actor. As such, even the environment that allows for printing to stdout is passed as a parameter.

References

[edit]
  1. ^ https://github.com/ponylang/ponyc/blob/master/LICENSE
  2. ^ "Verona FAQ". Github.
  3. ^ https://www.ponylang.org/media/papers/fast-cheap.pdf
  4. ^ Sylvan Clebsch, Sophia Drossopoulou, Sebastian Blessing, Andy McNeil (October 2015). "Deny capabilities for safe, fast actors". In Elisa Gonzalez Boix, Philipp Haller, Alessandro Ricci, Carlos Varela (ed.). AGERE! 2015: Proceedings of the 5th International Workshop on Programming Based on Actors, Agents, and Decentralized Control. Pittsburgh, PA, USA: Association for Computing Machinery. pp. 1–12. doi:10.1145/2824815.2824816. ISBN 9781450339018.{{cite conference}}: CS1 maint: multiple names: authors list (link)
[edit]
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