Opa (programming language): Difference between revisions

Revision as of 04:58, 25 December 2024

Revision as of 05:00, 25 December 2024

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The core language is [[Functional programming|functional]] and has a static [[type system]] with [[type inference]]. Opa also provides sessions which encapsulate an [[Imperative programming|imperative]] state and communicate using [[message passing]], similar to [[Erlang (programming language)|Erlang]] processes. Opa provides many structures or functions that are common in [[web development]], as [[first-class citizen]] objects, for instance [[HTML]]<ref>{{cite web|url=http://www.i-programmer.info/news/98-languages/2961-opa-a-unified-approach-to-web-programming.html |title=Opa – a unified approach to web programming |publisher=i-Programmer |date=28 August 2011}}</ref> and [[parser]]s, based on [[parsing expression grammar]]s.<ref>{{cite journal |last1=Koprowski |first1=Binsztok |year=2011 |url=http://www.lmcs-online.org/ojs/viewarticle.php?id=708&layout=abstract |title=TRX: A Formally Verified Parser Interpreter |journal=Logical Methods in Computer Science}}</ref> Because of this adhesion between the language and web-related concepts, Opa is not intended for non-web applications (for instance [[desktop application]]s).<ref>{{cite web |url=http://linuxfr.org/news/opa-un-nouveau-langage-pour-le-d%C3%A9veloppement-d%E2%80%99applications-web |title=Opa, un nouveau langage pour le développement d'applications Web|publisher=LinuxFr |language=Fr |date=22 June 2011}}</ref>

The 0.9.0 release in February 2012 introduced database mapping technology for the non-relational, document-oriented database [[MongoDB]], similar to [[object-relational mapping]].<ref>{{cite web|url=http://doc.opalang.org/#!/manual/Hello--database|title=Hello, database|publisher=Opa Documentation|access-date=2012-02-22|archive-url=https://web.archive.org/web/20140112111933/http://doc.opalang.org/#!/manual/Hello--database|archive-date=2014-01-12|url-status=dead}}</ref><ref>{{cite web|url=http://doc.opalang.org/#!/manual/Low-level-MongoDB-support|title=Low-level MongoDB support|publisher=Opa Documentation|access-date=2012-02-22|archive-url=https://web.archive.org/web/20140112111933/http://doc.opalang.org/#!/manual/Low-level-MongoDB-support|archive-date=2014-01-12|url-status=dead}}</ref><ref>{{cite news|url=http://news.idg.no/cw/art.cfm?id=36C6A408-F2EE-3929-CB53260EBA6B884F|title=Programming Opa: Web development, reimagined|publisher=[[Computerworld]]|date=1 February 2012}}</ref>

The 1.1.0 release in February 2013 also added support for [[PostgreSQL]], paving the way for the support of several [[SQL]] databases.