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{{Infobox array language
{{DISPLAYTITLE:ngn/apl}}{{Infobox array language
| logo                    = [[File:Ngn-apl logo.png]]
| title                    = ngn/apl
| title                    = ngn/apl
| array model              = [[nested array model|nested]]
| array model              = [[nested array model|nested]]
| index origin            = 0
| index origin            = 0
| function styles          = [[dfn]], [[tacit]]
| function styles          = [[dfn]], [[tacit]]
| numeric types            = complex floats
| numeric types            = [[complex]] floats
| unicode support          = full
| unicode support          = full
| released                = 2011
| released                = 2011
| developer                = Nick Nickolov
| developer                = Nick Nickolov
| latest release version  = 2018 (unversioned)
| latest release version  = 2018 (unversioned)
| implementation languages = [https://en.wikipedia.org/wiki/Javascript Javascript]
| implementation language  = [[wikipedia:Javascript|Javascript]]
| platforms                = In-browser, [https://en.wikipedia.org/wiki/Node.js NodeJS]
| source                  = [https://github.com/abrudz/ngn-apl/ GitHub]
| license                  = [https://en.wikipedia.org/wiki/MIT_License MIT]
| platforms                = In-browser, [[wikipedia:Node.js|Node.js]]
| website                  = [https://gitlab.com/n9n/apl gitlab.com/n9n/apl]
| license                  = [[wikipedia:MIT_License|MIT]]
| website                  = [https://github.com/abrudz/ngn-apl/ github.com/abrudz/ngn-apl]
| influenced by            = [[Dyalog APL]]
| influenced by            = [[Dyalog APL]]
| run online              = [https://abrudz.github.io/ngn-apl/web/ In-browser]
}}
}}
'''ngn/apl''' is an APL bytecode compiler and interpreter by Nick Nickolov. Because it is implemented in [[wikipedia:Javascript|Javascript]], it can be run in [[wikipedia:Node.js|Node.js]] or any modern browser.


:''For technical reasons, this page is named "Ngn/apl". The actual name of the implementation is "ngn/apl".''
On December 27, 2020, Nickolov announced that he would discard his implementation.<ref>Nickolov, N. "ngn". [https://chat.stackexchange.com/transcript/message/56558504#56558504 Announcement]. [[APL Orchard]]. Stack Exchange chat.</ref> Soon after, [[Adám Brudzewsky]] took up the mantle of hosting the source and online demo.<ref>Brudzewsky, A. "Adám". [https://chat.stackexchange.com/transcript/message/56558600#56558600 Announcement]. [[APL Orchard]]. Stack Exchange chat.</ref>
[[File:Ngn/apl|center|thumb|ngn/apl's [https://abrudz.github.io/ngn-apl/web/ demo interface]]]


An APL interpreter written in JavaScript by Nick Nickolov. It can run in a browser or on NodeJS.
== Features ==


ngn/apl supports most primitives, dfns (<code>{⍺ ⍵}</code>), nested arrays, complex numbers (<code>1j2</code>), infinities (<code>¯</code> or <code>∞</code>), [[forks and atops|Trains]], strand assignment (<code>(a b)←c</code>), indexed assignment (<code>a[b]←c</code>), user-defined operators (<code>{⍺⍺ ⍵⍵}</code>), but does not support tradfns (<code>∇R←X f Y</code>), non-zero index origin (<code>⎕IO</code>), comparison tolerance (<code>⎕CT</code>), prototypes, [[modified assignment]] (<code>x+←1</code>), [[control structures|Keywords]] (<code>:If</code>), [[object-oriented features|Object orientated programming]], namespaces.
ngn/apl partially supports some of the core language of [[Dyalog APL 14.0]]:
* [[dfn]]s (<syntaxhighlight lang=apl inline>{⍺ ⍵}</syntaxhighlight>)
* [[nested array]]s
* [[complex number]]s (<syntaxhighlight lang=apl inline>1j2</syntaxhighlight>)
* [[Function train|forks and atops]]
* [[Multiple assignment|strand assignment]] (<syntaxhighlight lang=apl inline>(a b)←c</syntaxhighlight>)
* [[indexed assignment]] (<syntaxhighlight lang=apl inline>a[b]←c</syntaxhighlight>)
* [[dop|user-defined operators]] (<syntaxhighlight lang=apl inline>{⍺⍺ ⍵⍵}</syntaxhighlight>), using the <syntaxhighlight lang=apl inline>⍶</syntaxhighlight> and <syntaxhighlight lang=apl inline>⍹</syntaxhighlight> glyphs in place of Dyalog's <syntaxhighlight lang=apl inline>⍺⍺</syntaxhighlight> and <syntaxhighlight lang=apl inline>⍵⍵</syntaxhighlight>.


== External link ==
The following features of Dyalog APL are not supported:
* <syntaxhighlight lang=apl inline>!</syntaxhighlight> does not work with negative or complex operands.
* [[Where]] (<syntaxhighlight lang=apl inline>⍸</syntaxhighlight>)
* [[Over]] (<syntaxhighlight lang=apl inline>⍥</syntaxhighlight>)
* [[Atop]] (<syntaxhighlight lang=apl inline>⍤</syntaxhighlight>)
* [[Nest]] (<syntaxhighlight lang=apl inline>⊆</syntaxhighlight>)
* [[Partitioned enclose]] (<syntaxhighlight lang=apl inline>⊆</syntaxhighlight>)
* [[At]] (<syntaxhighlight lang=apl inline>@</syntaxhighlight>)
* [[Stencil]] (<syntaxhighlight lang=apl inline>⌺</syntaxhighlight>)
* [[Unique mask]] (<syntaxhighlight lang=apl inline>≠</syntaxhighlight>)
* [[Key]] (<syntaxhighlight lang=apl inline>⌸</syntaxhighlight>)
* [[Rank (operator)|Rank (operator]] (<syntaxhighlight lang=apl inline>⍤</syntaxhighlight>)
* [[tradfn]]s (<syntaxhighlight lang=apl inline>∇R←X f Y</syntaxhighlight>)
* non-zero [[index origin]] (<syntaxhighlight lang=apl inline>⎕IO←1</syntaxhighlight>)
* [[comparison tolerance]] (<syntaxhighlight lang=apl inline>⎕CT</syntaxhighlight>)
* [[prototype]]s (it always uses zero as fill)
* [[modified assignment]] (<syntaxhighlight lang=apl inline>x+←1</syntaxhighlight>)
* [[keyword]]s (<syntaxhighlight lang=apl inline>:If</syntaxhighlight>)
* [[object-oriented programming]]
* [[namespace]]s.
* inverses.


* [https://n9n.gitlab.io/apl/web/index.html Online demo]
It extends Dyalog APL with:
* [[Infinity|infinities]] (<syntaxhighlight lang=apl inline>¯</syntaxhighlight> or <syntaxhighlight lang=apl inline>∞</syntaxhighlight>)
* the identity element operator (<syntaxhighlight lang=apl inline>⍁</syntaxhighlight>)
* exceptions (<syntaxhighlight lang=apl inline>↗</syntaxhighlight>)
 
== External links ==
* [http://archive.vector.org.uk/art10501160 ''Compiling APL to JavaScript''] article in the [[Vector journal]]
* [https://repl.it/languages/APL ngn/apl on REPL]
* [https://tio.run/#apl-ngn ngn/APL on Try It Online]
* [https://abrudz.github.io/ngn-apl/web/ Online demo]
* [https://plj541.github.io/APL.js/ Online session]
* [https://plj541.github.io/APL.js/ Online session]
* [https://repl.it/languages/APL Online REPL]
* [https://github.com/abrudz/ngn-apl/ Source code]
* [https://tio.run/#apl-ngn Try It Online]
== References ==
* [https://gitlab.com/n9n/apl Source code]
<references/>
 
{{APL dialects}}[[Category:APL dialects]][[Category:Nested array languages]][[Category:Leading axis languages]][[Category:Languages with tacit programming]][[Category:IR compilers]]
{{APL programming language}}

Latest revision as of 12:25, 31 August 2023

ngn/apl is an APL bytecode compiler and interpreter by Nick Nickolov. Because it is implemented in Javascript, it can be run in Node.js or any modern browser.

On December 27, 2020, Nickolov announced that he would discard his implementation.[1] Soon after, Adám Brudzewsky took up the mantle of hosting the source and online demo.[2]

File:Ngn/apl
ngn/apl's demo interface

Features

ngn/apl partially supports some of the core language of Dyalog APL 14.0:

The following features of Dyalog APL are not supported:

It extends Dyalog APL with:

  • infinities (¯ or ∞)
  • the identity element operator (⍁)
  • exceptions (↗)

External links

References

  1. ↑ Nickolov, N. "ngn". Announcement. APL Orchard. Stack Exchange chat.
  2. ↑ Brudzewsky, A. "Adám". Announcement. APL Orchard. Stack Exchange chat.
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