ngn/apl

NOTE: I'm archiving this repository since my changes here were successfully merged upstream via my PR to allow installing as an offline PWA.

Try using it online here. It can also be used as a PWA (Progressive Web App) on a computer / phone - even without internet!

---

An APL interpreter written in JavaScript. Runs in a browser or NodeJS.

Supports: most primitives, dfns ({⍺ ⍵}), nested arrays, complex numbers (1j2), infinities (¯ or ∞), forks and atops, strand assignment ((a b)←c), indexed assignment (a[b]←c), user-defined operators ({⍺⍺ ⍵⍵}).

Doesn't support: tradfns (∇R←X f Y), non-zero index origin (⎕IO), comparison tolerance (⎕CT), prototypes, modified assignment (x+←1), control structures (:If), object-oriented features, namespaces.

Used in Paul L Jackson's web site, repl.it, and tio.run.

Offline usage with NodeJS

Run apl.js with Node to start a REPL:

node apl.js

An APL script can be given as argument:

node apl.js filename.apl

apl.js can be require()d as a CommonJS module from JavaScript:

var apl=require('./apl')
var r=apl('1 2 3+4 5 6')

or used in an HTML page:

<script src='apl.js'></script>
<script>var r=apl('1 2 3+4 5 6')</script>

Editor support

• Vim keymap and syntax
• baruchel/vim-notebook: evaluate blocks of APL code in a vim buffer