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| run online              = [https://abrudz.github.io/ngn-apl/web/ In-browser]
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'''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.
'''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.
 
ngn/apl supports most 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>), and [[dop|user-defined operators]] (<syntaxhighlight lang=apl inline>{⍺⍺ ⍵⍵}</syntaxhighlight>), but does not support [[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]], or [[namespace]]s. It extends Dyalog APL with [[Infinity|infinities]] (<syntaxhighlight lang=apl inline>¯</syntaxhighlight> or <syntaxhighlight lang=apl inline>∞</syntaxhighlight>) and a few additional primitives.


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>
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]]]
[[File:Ngn/apl|center|thumb|ngn/apl's [https://abrudz.github.io/ngn-apl/web/ demo interface]]]
== External link ==
 
== Features ==
 
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>.
 
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.
 
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]]
* [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://repl.it/languages/APL ngn/apl on REPL]

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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