WASM
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Output
Ready — type an expression and press Execute
Session
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APL Session — workspace state persists between evaluations
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0 expressions
f⍵
⍺f⍵

⌨ Keyboard Shortcuts

Execution

Execute code⌘ + Enter

File Management

Save to file⌘ + S

Editing

Undo⌘ + Z
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Find⌘ + F
Find & Replace⌘ + ⇧ + F
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Session

Navigate history↑ / ↓
Clear session⌘ + L

General

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APL Symbol Input — Standard Dyalog Layout

Prefix modeType ` then a key
Literal backtick` then Space
Tab completionType 2 ASCII chars + Tab → APL symbol (269 pairs)
Number Row:
1 ¨2 ¯3 <4 ≤5 =6 ≥ 7 >8 ≠9 ∨0 ∧- ×= ÷
QWERTY Rows:
q ?w ⍵e ∊r ⍴t ~ y ↑u ↓i ⍳o ○p * a ⍺s ⌈d ⌊f _g ∇ h ∆j ∘k 'l ⎕ z ⊂x ⊃c ∩v ∪b ⊥ n ⊤m |
Shifted:
E ⍷T ⍨I ⍸O ⍥P ⍣ F ⍛G ⍢J ⍤K ⌸L ⌷ Z ⊆X ⊇Q ⍰N ¤M ∥ : ≡" ≢_ !~ ⌺ # ⍒$ ⍋% ⌽^ ⍉& ⊖ * ⍟+ ⌹( ⍱) ⍲
Punctuation:
[ ←] →; ⍎' ⍕ \ ⊢| ⊣, ⍝. ⍀ / ⌿< ⍪> ⍙? ⍠ { ⍞} ⍬` ⋄

⍋ APL Run

A dual-dialect APL interpreter — pure Rust compiled to WebAssembly

The Interpreter

Written entirely from scratch in Rust — no dependencies on any existing APL implementation. Supports two dialects: GNU APL (default) and Dyalog APL. Switch with ⎕DIALECT←'dyalog'.

Dialect Compatibility

FeatureGNU APLDyalog
Core Primitives
Scalar fns + - × ÷ * ⍟ | ⌈ ⌊ ! ○✅✅
Structural ⍴ ⍉ , ⍪ ⌽ ⊖ ↑ ↓ ⊂ ⊃ ⊆✅✅
Search ⍳ ⍸ ∊ ⍷ ∪ ∩ ⍋ ⍒ ≡ ≢✅✅
Logic = ≠ < > ≤ ≥ ∨ ∧ ⍱ ⍲ ~✅✅
Math ⊥ ⊤ ⌹ ? !✅✅
Operators
Core / \ ⌿ ⍀ ¨ ⍨ ⍣ ∘ .✅✅
Rank ⍤—✅
Over ⍥—✅
At @—✅
Key ⌸—✅
Stencil ⌺—✅
Variant ⍠—✅
Control Flow
Dfns {⍺ ⍵}✅✅
Tradfns ∇✅✅
Guards cond: expr✅✅
:If :ElseIf :Else :EndIf—✅
:For :In :EndFor—✅
:While :EndWhile—✅
:Repeat :Until—✅
:Select :Case :EndSelect—✅
:Leave :Continue—✅
System Functions
⎕IO ⎕TS ⎕UCS ⎕CT ⎕PP ⎕PW✅✅
⎕JSON ⎕CSV ⎕XML—✅
⎕NS ⎕NC ⎕NL ⎕CLASS—✅
⎕NGET ⎕NPUT ⎕NEXISTS ⎕MKDIR—✅
⎕C ⎕DT ⎕DL ⎕VFI ⎕SIGNAL—✅
⎕TRAP ⎕DMX—⚠

Test Coverage

Verified against the official GNU APL test suite and 137 Dyalog-specific tests:

📊 View GNU APL Test Suite Coverage Report

Data Storage

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