TOtosh·Jul 28, 2024Submission
A List of companies that use Array Languages (J, K, APL, q)
77 points · Open discussioninterregna
arraylanguage-companies
OPEN SOURCE2021–2024
interregna / arraylanguage-companies
arraylanguage-companies
A List of companies that use Array Languages (J, K, APL, q)
7Distinct people
10Mentions
0Explicit recommenders
102GitHub stars
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What it is
A List of companies that use Array Languages (J, K, APL, q)
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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Also in these discussions
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year10 dated mentions
Observed mentions: 2021-07-16 16:06:25 UTC to 2024-07-28 06:41:52 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 3 | 1 | 2 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 2 | 1 | 1 |
What Hacker News says
10 sourcesI've heard it's seen limited adoption in finance.
https://github.com/interregna/arraylanguage-companies
In J vs. K by Example (2005)array languages are used by several companies for their work. K for example is pretty popular in fintech. Some present companies provide services for array languages as well.
https://www.dyalog.com/case-studies/index.htm
https://github.com/interregna/arraylanguage-companies
In Uiua: A minimal stack-based, array-based languageLots of financial institutions at https://github.com/interregna/arraylanguage-companies but plenty of others too. (And that's a hobbyist-created list; not at all exhaustive.)
In APL Since 1978 (2020) [pdf]> since they mostly have no new learners who aren't into PL history.
They do have have new learners, that was my whole point. Whether they learn out of historical interest, to become better programmer in general, for a job, for research, or because they need it for a specific project does not matter. (And yes all those reasons apply.)
Take a look at companies using APL:
https://github.com/interregna/arraylanguage-companies
Or look how many people use it to solve Advent of Code.
As for learning them as a first language, if we applied that criteria then most programming languages would be born absolutely dead and stay there. I don't think anyone ever learned Elm or Purescript as their first language, are they dead?
I really don't get why people make such weird claims, declaring healthy and obviously alive communities to be dead. Again, thin
Read the rest
gs don't need to popular to be alive.
A list of companies using array languages is maintained here: https://github.com/interregna/arraylanguage-companies
In Dyalog APL 18.2Companies that use APL and other array languages in production:
https://github.com/interregna/arraylanguage-companies
In Mastering Dyalog APL (2009) [pdf]This website has a few companies which use K: https://github.com/interregna/arraylanguage-companies
In Stages of DenialA List of companies that use Array Languages
2 points · Open discussion