Opa (programming language): Difference between revisions

Revision as of 04:01, 25 April 2020

Revision as of 18:15, 11 May 2020

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The traditional [[Hello world program]], producing a web server that serves a static page with "Hello, web!" as its content, can be written in Opa as:<ref>{{cite web |url=http://www.morganhill.co.uk/cloud/opa-the-cloud-language-test-drive/ |title=Opa, the cloud language – a test drive |date=26 July 2011 |publisher=Morgan Hill |author=Alastair Aitken |access-date=6 September 2011 |archive-url=https://web.archive.org/web/20110925044819/http://www.morganhill.co.uk/cloud/opa-the-cloud-language-test-drive/ |archive-date=25 September 2011 |url-status=dead }}</ref>

<sourcesyntaxhighlight lang="opa">

Server.start(Server.http,

{ title: "Hello"

Line 49:

}

)

</syntaxhighlight>

</source>

It can be compiled to a stand-alone executable JS file with:

<sourcesyntaxhighlight lang="bash">

$ opa hello_web.opa

</syntaxhighlight>

</source>

Running the resulting executable JS file launches the web application:

<sourcesyntaxhighlight lang="bash">

$ ./hello_web.js

</syntaxhighlight>

</source>

== See also ==