Top 1K Features Creators Events Podcasts Books Extensions Interviews Blog Explorer CSV

J

< >

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

#108on PLDB 34Years Old 468Repos
Download source code:
git clone https://github.com/jsoftware/jsource
Homepage · REPL · Try It Online · Source Code · Wikipedia · Docs

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...


Example from Riju:
echo 'Hello, world!'
Example from hello-world:
#!/opt/local/bin/jc echo 'Hello World' exit ''
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

Language features

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

- Build the next great programming language · Add · Issues · About · Search · Keywords · Livestreams · Labs · Resources · Acknowledgements

Built with Scroll v162.1.0