J is an actively used programming language created in 1990. 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...

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Example code from the Hello World Collection:

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

Example code from Linguist:

echo 'Hello, GitHub!'
exit ''

Example code 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

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Last updated August 9th, 2020

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