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

41 todsacerdoti 6 5/3/2025, 8:40:59 PM github.com ↗

Comments (6)

pixelpoet · 4h ago

The title stops just short of the

gitroom · 1h ago

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

t-writescode · 2h 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 · 1h 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...

prezjordan · 5h 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 · 4h ago

Unintentional humour with how the title got cut off?