# K notebooks

This part of the capsule houses my K notebooks.  It is powered by kral, my lightweight sort-of alternative to Jupyter Notebooks.

> Kráľomoc:
> Exoplanet HAT-P-5b, a 'hot Jupiter' in the constellation of Lyra; an ancient Slovak term for the planet Jupiter.

=> example.kn Example notebook
=> /git/kral View the kral Git repository

kral exclusively uses the Gemini protocol and the K programming language.  kral parses .kn notebooks and evaluates embedded K code.  It then outputs Gemtext with the results embedded into the page.

K code is delimited by three pipes (looks like Ⅲ).  These can be on their own lines, enclosing a block of code, or inline.  For example, Ⅲ-1*|!9Ⅲ outputs |||-1*|!9|||.  It's not the prettiest or tersest delimiter, but given that K not only uses but overloads every ASCII character, it was quite hard to find something suitably unlikely to appear in the code being evaluated.  Ⅲ was chosen as it is equivalent to | in both the monadic and dyadic cases (I think), so it is unlikely to be used in K code.  I'm also fairly sure that | can't occur at the end of a K expression (other than in a comment), so it should be easy to distinguish the ending delimiter from the code preceding it.

## K? Gemini?  Huh?

Gemini is a lightweight alternative to HTTP, but not quite as lightweight as Gopher.  But if you're viewing this, you probably already knew that.

=> gemini://gemini.circumlunar.space The Gemini protocol

K is an array-based programming language descended from APL.  Originally developed by computer scientist Arthur Whitney, it has found a niche in finance, but has traditionally remained closed-source and prohibitively expensive.  kral uses ngn/k, an open-source implementation of K6.

=> https://codeberg.org/ngn/k ngn/k

## But why would you do this?

Partly to teach myself K, but mainly because it was fun.