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Understanding-j: An introduction to the J programming language that gets to the

https://github.com/bugsbugsbux/understanding-j
43•todsacerdoti•9h ago

Comments

prezjordan•6h ago
To the author: you can add a .devcontainer directory with a Dockerfile, allowing folks to try this in their browser with GitHub Codespaces

Shameless plug, feel free to copy my setup! https://github.com/jdan/try-j

userbinator•5h ago
Unintentional humour with how the title got cut off?
pixelpoet•5h ago
The title stops just short of the
t-writescode•3h ago
From the doc,

  _3                  NB. negative numbers start with underscore
  _                   NB. sole underscore is infinity: a number
  __                  NB. negative infinity
Is this a standard I'm unaware of?
avmich•2h ago
The use of underscore for negative numbers is J's choice, explained e.g. here - https://www.jsoftware.com/docs/help807/jforc/preliminaries.h... .

Explicitly representing infinity, and working with it in some cases, allows to reduce number of exceptions...

gitroom•1h ago
Underscore stuff always throws me off - never quite got used to how J does it. Gotta respect the weird choices though.

What went wrong with wireless USB

http://oldvcr.blogspot.com/2025/05/what-went-wrong-with-wireless-usb.html
111•goldenskye•4h ago•12 comments

Brian Eno's Theory of Democracy

https://www.programmablemutter.com/p/brian-enos-theory-of-democracy
14•akkartik•57m ago•0 comments

Gorgeous-GRUB: collection of decent community-made GRUB themes

https://github.com/Jacksaur/Gorgeous-GRUB
172•todsacerdoti•7h ago•37 comments

Show HN: Free, in-browser PDF editor

https://breezepdf.com
428•philjohnson•11h ago•99 comments

A Survey of AI Agent Protocols

https://arxiv.org/abs/2504.16736
33•distalx•3h ago•9 comments

Pascal for Small Machines

http://pascal.hansotten.com/
38•ibobev•4h ago•3 comments

Programmers Guide to the AMIBIOS (1993) [pdf]

http://bitsavers.org/pdf/americanMegatrends/Programmers_Guide_to_the_AMIBIOS_1993.pdf
34•1vuio0pswjnm7•3h ago•8 comments

I built a pixel art editor after playing Octopath Traveler II

22•Kobayashiii•2d ago•2 comments

DuckDB is probably the most important geospatial software of the last decade

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229•dbreunig•10h ago•74 comments

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77•neversaydie•3d ago•29 comments

Legendary Bose Magic Carpet Suspension Is Finally Going Global

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134•PaulHoule•3d ago•79 comments

DotnetSnes: Library allowing to use C# to create SNES ROMs

https://github.com/KallDrexx/DotnetSnes
20•ingve•1d ago•0 comments

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28•namanyayg•4h ago•17 comments

Run LLMs on Apple Neural Engine (ANE)

https://github.com/Anemll/Anemll
237•behnamoh•14h ago•98 comments

Numerical Linear Algebra Class in Julia TUM

https://venkovic.github.io/NLA-for-CS-and-IE.html
77•darboux•8h ago•2 comments

Time saved by AI offset by new work created, study suggests

https://arstechnica.com/ai/2025/05/time-saved-by-ai-offset-by-new-work-created-study-suggests/
275•amichail•16h ago•265 comments

Why can't HTML alone do includes?

https://frontendmasters.com/blog/seeking-an-answer-why-cant-html-alone-do-includes/
272•susam•17h ago•227 comments

When flat rate movers won't answer your calls

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190•kevincox•9h ago•126 comments

QModem 4.51 Source Code

https://github.com/AaronFriel/qmodem-4.51
177•AaronFriel•14h ago•67 comments

A simple Common Lisp web app

https://www.scotto.me/blog/a-simple-common-lisp-web-app/
23•silcoon•3d ago•7 comments

Minimum Viable Blog

https://ostwilkens.se/blog/setting-up-blog
307•jlundberg•21h ago•152 comments

Why I stopped angel investing after 15 years (and what I'm doing instead)

https://halletecco.substack.com/p/why-i-stopped-angel-investing-after
168•mooreds•16h ago•156 comments

Jewels linked to Buddha remains go to auction, sparking ethical debate

https://www.bbc.com/news/articles/ckg2elg3zxyo
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Helpcare AI (YC F24) Is Hiring

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1•hsial•9h ago

We fell out of love with Next.js and back in love with Ruby on Rails

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330•mike1o1•11h ago•304 comments

Buffett to step down following six-decade run atop Berkshire

https://www.bloomberg.com/news/articles/2025-05-03/warren-buffett-to-step-down-from-berkshire-hathaway-at-year-end
346•mfiguiere•11h ago•272 comments

RethinkDNS Resolver That Deploys to CF Workers, Deno Deploy, Fastly, Fly.io

https://github.com/serverless-dns/serverless-dns
81•indigodaddy•12h ago•8 comments

Creating the Commodore 64: The Engineers' Story

https://spectrum.ieee.org/commodore-64
57•amichail•4d ago•5 comments

Understanding-j: An introduction to the J programming language that gets to the

https://github.com/bugsbugsbux/understanding-j
43•todsacerdoti•9h ago•6 comments

The US has approved CRISPR pigs for food

https://www.technologyreview.com/2025/05/02/1116059/the-us-approves-crispr-pigs-for-food/
86•DocFeind•15h ago•113 comments