J - Programming language

J is an open source programming language created in 1990 by Kenneth E. Iverson and Roger Hui.

Source code:

git clone https://github.com/jsoftware/jsource

#173on PLDB

34Years Old

468Repos

Try now: Riju · TIO

The J programming language, developed in the early 1990s by Kenneth E. Iverson and Roger Hui, is a synthesis of APL (also by Iverson) and the FP and FL function-level languages created by John Backus. To avoid repeating the APL special-character problem, J uses only the basic ASCII character set, resorting to the use of the dot and colon as inflections to form short words similar to digraphs. Read more on Wikipedia...

J website
J Wikipedia page
J is developed on GitHub and has 536 stars
Watch the history of the J repo visualized with Gource
J docs
There are at least 468 J repos on GitHub
J first developed in Jsoftware Inc
file extensions for J include ijs
The Google BigQuery Public Dataset GitHub snapshot shows 124 users using J in 151 repos on GitHub
There are 2,478 Project Euler users using J
Explore J snippets on Rosetta Code
J on HOPL
J appears in the TIOBE Index
Pygments supports syntax highlighting for J
GitHub supports syntax highlighting for J
There is 1 Jupyter Kernel for J
jsoftware.com was registered in 1996
See also: (13 related languages)Linux, APL, FP, FL, NumPy, SuperCollider, ASCII, Unix, SQL, C, Unicode, K, Q
Read more about J on the web: 1.

Example from Riju:

echo 'Hello, world!'

Example from hello-world:

#!/opt/local/bin/jc
echo 'Hello World'
exit ''

Example from the Hello World Collection:

NB. Hello World in J
'Hello World' 1!:2(2)

Example from Linguist:

#!/bin/jconsole
echo 'Hello, GitHub!'
exit ''

Example from Wikipedia:

3 |. 1 0 1 1 0 0 1 1 1 1 1             NB. rotate
1 0 0 1 1 1 1 1 1 0 1

Feature	Supported	Token	Example
Integers	✓		NB. _?\d+
Floats	✓		NB. _?\d+\.(?=\d+)
Strings	✓	'	'Hello world'
Print() Debugging	✓	echo
Line Comments	✓	NB.	NB. A comment
Comments	✓
Semantic Indentation	X

J

J - Programming language

Language features