Pony (programming language): Difference between revisions

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{{Short description|Programming language}}

{{User sandbox}}

{{Infobox programming language

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| name = Pony

| logo = Main_galloping.svg

| paradigm = [[Actor model]], [[object-oriented programming|Object-oriented]], [[Imperative programming|Imperative]]

| designer = Sylvan Clebsch<ref>{{cite web |title=Sylvan Clebsch |website=[[Association for Computing Machinery|ACM]] |url=https://dl.acm.org/profile/83358632257}}</ref>

| influenced by = [[E (programming language)|E]]<ref name="gems">{{cite web|author1=Daniele BonettaLuca|author2=Svizzera italiana|author3=Stefan Marr|author4=Walter Binder|url=https://labs.oracle.com/pls/apex/f?p=LABS:0:107979754432222:APPLICATION_PROCESS=GETDOC_INLINE:::DOC_ID:975|title=GEMS: Shared-Memory Parallel Programming for Node.js|quote=Pony is itself inspired by the design of E's programming model|website=oracle|date=2 November 2016|access-date=10 March 2025}}</ref>

| influenced = [[Project Verona]]<ref name="zdnetver">{{Cite web|url=https://www.zdnet.com/article/microsoft-opens-up-rust-inspired-project-verona-programming-language-on-github/|title=Microsoft opens up Rust-inspired Project Verona programming language on GitHub|quote="Project Verona, which also borrows concepts from Cyclone, a "safe dialect of C" and Pony, which has key contributors from Microsoft Research"|author1=Liam Tung|website=ZDNet}}</ref>

| released = {{Start date and age|2015|04|28|df=yes}}<ref>{{cite web |title=First public release | website=[[GitHub]] |url=https://github.com/ponylang/ponyc/releases/tag/0.1.0 |date=28 April 2015}}</ref>

| latest_release_version = 0.59.0

| year latest_release_date = {{releasestart date and age|20122025|1104|0926}}

| typing = [[strong typing|strong]], [[static typing|static]], [[type inference|inferred]], [[nominal typing|nominal]], [[structural typing|structural]]

| website = {{URL|http://www.ponylang.org}}

| license = [[BSD licenses|BSD]]-2.<ref>{{cite web | url=https://github.com/ponylang/ponyc/blob/master/LICENSE | title=Ponyc/LICENSE at main · ponylang/Ponyc | website=[[GitHub]] }}</ref>

| programming_language = Pony}}[[C (programming language)|C]]

}}

'''Pony''' (also referred to as '''ponylang''') is a [[Free software|free]] and [[open-source|open source]], object-oriented, [[actor model]], [[Capability-based security|capabilities-secure]], high performance programming language.{{Sfn|Allen|2024}}<ref name="adabeat">{{cite web | date=8 August 2024 |title=Introduction to Actor Model |url=https://adabeat.com/fp/introduction-to-actor-model/ |access-date=8 March 2025 |website=adabeat}}</ref> Pony's reference capabilities allow even mutable data to be safely [[Evaluation strategy#Call by reference|passed by reference]] between actors. [[Garbage collection (computer science)|Garbage collection]] is performed [[Concurrency (computer science)|concurrently]], per-actor, which eliminates the need to pause program execution or [[Tracing garbage collection#Stop-the-world vs. incremental vs. concurrent|"stop the world"]].<ref name="orca">{{cite journal |author1=Sylvan Clebsch | author2=Juliana Franco | author3=Sophia Drossopoulou |date=12 October 2017 |title=Ownership and Reference Counting Based Garbage Collection in the Actor World |url=https://dl.acm.org/doi/10.1145/3133896 |access-date=24 December 2024 |journal=Proc. ACM Program. Lang.| volume=1 | issue=OOPSLA | pages=72:1–72:28 | doi=10.1145/3133896}}</ref><ref name="soc5">{{cite web | publisher=Society 5 Solutions | date=15 October 2024 |title=Introduction to the Pony Programming Language |url=https://www.linkedin.com/pulse/introduction-pony-programming-language-society-5-solutions-llc-s3ppf |access-date=28 December 2024 |website=LinkedIn}}</ref><ref name="dcpony">{{Cite web| author=Daniel Caccamo| year= 2018| title = GoA: Actors with Locally Managed Memory for Go| url= https://uwspace.uwaterloo.ca/bitstreams/b7bb2925-6bd6-49ab-a9b3-bc7581139529/download| access-date=28 December 2024 |website=UWSpace}}</ref> Sylvan Clebsch is the original creator of the language.<ref name="pfintech">{{cite web | author=Charles Humble |date=14 March 2016 |title=Using the Actor-model Language Pony for FinTec |url=https://www.infoq.com/news/2016/03/pony-fintech/ |access-date=24 December 2024 |website=InfoQ}}</ref><ref name="pqc2020">{{cite web |author=Sophia Drossopoulou |date=14 September 2020 |title=Pony, Actors, Causality, Types, and Garbage Collection |url=https://www.infoq.com/presentations/pony-types-garbage-collection/ |access-date=24 December 2024 |website=InfoQ}}</ref> It is now being maintained and developed by members of the Pony team.<ref>{{cite web |title=Team Pony | website=[[GitHub]] |url=https://github.com/orgs/ponylang/people |access-date=28 December 2024}}</ref>

= Pony (programming language) =

==History==

{{Infobox programming language

The language was created by Sylvan Clebsch, while a [[PhD]] student at [[Department of Computing, Imperial College London|Imperial College London]]. His professor at that time was [[Sophia Drossopoulou]], who is also well known for her contributions to computer programming, and as a lecturer. According to developers who have talked to Sylvan, he was frustrated with not having a high performance language that could run concurrent code securely, safely, and more simply.<ref name="kgpony">{{cite conference |author=Kristoffer Grönlund |date=22 January 2018 | publisher=[[Linux.conf.au|Linux Conference Australia 2018 (LCA2018)]] |title=Everyone gets a pony!| url=https://archive.org/details/lca2018-Everyone_gets_a_pony| access-date=28 December 2024 |website=archive}}</ref>

| paradigm = [[Actor model]]

| designer = Sylvan Clebsch

| website = {{URL|http://www.ponylang.org}}

| year = {{release date and age|2012|11|09}}

| programming_language = Pony}}

==Language design==

Pony is an actor based language created by Sylvan Clebsch in 2012<ref name="pony-initial-commit>{{cite web|url=https://github.com/ponylang/ponyc/commit/0192983a0f73d2d490cc901b952534b2d27915dd|title=initial git commit for ponyc}}</ref>. One of the languages unique features is the use of reference capabilities by the compiler in order to enforce correct access to program state within the context of the natural high concurrency supported by the [[Actor model|actor model]].

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

=== Safety ===

* [[Type safety]] - Pony is a type safe language.<ref name="jmpony">{{cite web |author=John Mumm |date=19 March 2019 |title=Safely Sharing Data: Reference Capabilities in Pony |url=https://talks.codemotion.com/safely-sharing-data-reference-capabiliti |access-date=28 December 2024 |website=codemotion}}</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.{{Sfn|Allen|2024}}<ref name="atpony">{{cite conference |author=Ankush Thakur |date=21 December 2024 | title=12 New Programming Languages You Should Know| url=https://geekflare.com/dev/new-programming-languages/| access-date=3 January 2025 |website=geekflare}}</ref>

* [[Exception safety]] - There are no runtime exceptions. All exceptions have defined semantics and are always caught.{{Sfn|MCStone|2023}}

* Concurrency safety - The type system employs reference capabilities to ensure (at compile time) that there are no [[Race condition|data races]] nor [[Deadlock (computer science)|deadlocks]].{{Sfn|Mölle|2017}}<ref name="ipony">{{cite web |author=Sean T Allen |date=30 May 2018 |title=Introduction to the Pony programming language |url=https://opensource.com/article/18/5/pony |access-date=28 December 2024 |website=opensource}}</ref><ref>{{cite conference |author1 = Sylvan Clebsch | author2 = Sophia Drossopoulou | author3 = Sebastian Blessing | 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><ref name="soundness">{{cite web|author1=Juliana Franco|author2=Sylvain Clebsch|author3=Sophia Drossopoulou|author4=Jan Vitek|author5=Tobias Wrigstad| url=https://www.doc.ic.ac.uk/research/technicalreports/2018/DTRS18-1.pdf|title=Soundness of a Concurrent Collector for Actors|website=imperial|date=9 March 2018|access-date=8 March 2025}}</ref>

=== Performance ===

* Lock-free - By design, Pony avoids the need for traditional locking mechanisms, which eliminates the overhead and contention associated with locks.<ref name="kgpony"></ref>

* Native code - Pony is an [[ahead-of-time compilation|ahead-of-time compiled language]]. There is no interpreter or virtual machine{{Sfn|Mölle|2017}}<ref name="atpony"></ref>

* Concurrent garbage collection - Each actor's heap is collected separately and concurrently, avoiding the need to "stop the world" for global collection.<ref name="pfintech"></ref><ref name="pqc2020"></ref><ref name="soundness"></ref>

==Examples==

===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.{{Sfn|Allen|2024}}{{Sfn|MCStone|2023}}

<syntaxhighlight lang="pony">

actor Main

new create(env: Env) =>

env.out.print("Hello, world!")

</syntaxhighlight>

There are no global variables in Pony, meaning everything must be contained within an instance of a class or an actor.<ref name="kgpony" /> As such, even the environment that allows for printing to [[stdout|standard output]] is passed as a parameter.<ref name="kgpony" />{{Sfn|Allen|2024}}

==References==

{{Reflist|30em}}

== Further reading ==

* {{cite journal |last=Mölle |first=Andreas |date=Dec 2017 |title=Developing concurrent programs with Pony |journal=[[Linux Magazine]] |issue=205 |issn=1536-4674}}

* {{Cite book |last1=MCStone |first1=Maverick |date=Dec 2023 |title=Pony Playbook: Mastering the Basics of Concurrent Programming|publisher=Independently Published|isbn=979-8870768175|language=en}}

* {{Cite book |last1=Allen |first1=Corby |date=Jul 2024 |title=Pony Programming: The Complete Guide to Building High-Performance, Concurrent, and Secure Applications with Pony |publisher=Independently Published|isbn=979-8332662072|language=en}}

== External links ==

* [http://www.ponylang.org OfficalOfficial website]

* [https://tutorial.ponylang.io/ Ponylang Tutorial]

* [https://www.infoq.com/interviews/clebsch-pony InfoQ Interview: Sylvan Clebsch on the Actor-Model Language Pony, Garbage Collection, Capabilities, Concurrency]

* [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]

* [http://dl.acm.org/citation.cfm?id=2824816 Deny capabilities for safe, fast actors by Sylvan Clebsch, Sophia Drossopoulou, Sebastian Blessing, Andy McNeil]

[[Category:Programming languages]]

[[Category:Concurrent programming languages]]

[[Category:Multi-paradigm programming languages]]

[[Category:Software using the BSD license]]

[[Category:Cross-platform software]]

[[Category:Cross-platform free software]]

[[Category:Free and open source compilers]]