APL - Programming language

APL, aka A Programming Language, is a programming language created in 1964 by Kenneth E. Iverson.

#98on PLDB

62Years Old

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APL (named after the book A Programming Language) is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. Read more on Wikipedia...

Tags: programming language, arrayLang
There are at least 416 APL repos on GitHub
Early development of APL happened in Harvard University
The Google BigQuery Public Dataset GitHub snapshot shows 87 users using APL in 95 repos on GitHub
There are 2,478 Project Euler users using APL
In the 2021 StackOverflow developer survey APL programmers reported a median salary of $75,631. 1% of respondents reported using APL. 536 programmers reported using APL, and 568 said they wanted to use it
Explore APL snippets on Rosetta Code
APL on HOPL
APL appears in the TIOBE Index
CodeMirror package for syntax highlighting APL
Pygments supports syntax highlighting for APL
GitHub supports syntax highlighting for APL
There is 1 Jupyter Kernel for APL
See also: (33 related languages) APLX, J, Go, K, MATLAB, Nial, Polymorphic Programming Language, Q, S, SAC, Speakeasy, Wolfram Language, IBM 1620, BASIC, MUSIC/SP, Unix, ISBN, ASCII, COBOL, Java, Linux, Ruby, R, Unicode, C, Fortran, C#, CIL, Microsoft Excel, GNU Octave, Scilab, LYaPAS, RPL
11 PLDB concepts link to APL: april, Axio, BQN, cloc, co-dfns, Futhark, Goal, Klong, Particles, Pygments, U

Example from Riju:

'Hello, world!'

Example from hello-world:

⎕←'Hello World'

Example from the Hello World Collection:

⍝ Hello World in APL

⎕←\'Hello World\'

Example from Linguist:

#!/usr/local/bin/apl --script
NEWLINE ← ⎕UCS 10
HEADERS ← 'Content-Type: text/plain', NEWLINE
HEADERS
⍝ ⎕←HEADERS
⍝ ⍕⎕TS
)OFF

Example from Wikipedia:

txt←'<html><body><p>This is <em>emphasized</em> text.</p></body></html>'
⎕←{⍵/⍨~{⍵∨≠\⍵}⍵∊'<>'}txt

Language features

Feature	Supported	Example	Token
Strings	✓	'Hello world'	'
Function Composition	✓	foo←f∘g
Line Comments	✓	⍝ A comment	⍝
Garbage Collection	✓
Comments	✓
Semantic Indentation	X