Actegories

https://bartoszmilewski.com/2026/06/30/actegories/

by ibobev • 9 days ago

51 9 9 days ago

bartoszmilewski.com

ultimatefan1• 8 days ago

this has a real "a monad is a monoid in the category of endofunctors" energy to it

paulluuk• 8 days ago

To understand actegories, let’s start with the definition of a monoidal category

Definitely not written for someone with my starting knowledge, haha.

lyall• 8 days ago

If you saw TFA and thought "hmmm yes, I know some of those words", then I can recommend the author's own lecture series on YouTube [0]. It's an intro to and overview of category theory aimed at programmers, with the requisite context and motivation for why anyone should care. It's long but worth the time investment IMHO.

0: http://www.youtube.com/playlist?list=PLbgaMIhjbmEnaH_LTkxLI7...

mkw5053• 8 days ago

He also has an excellent online/PDF version of the material[0]. All of it is really mind opening stuff, and fun!

[0] https://bartoszmilewski.com/2014/10/28/category-theory-for-p...

speed_spread• 8 days ago

Uh thanks but I'm gonna stick with Scattergories for now.

xqb642• 8 days ago

I'd like to understand how and why this stuff is useful for programmers.

jcarrano• 8 days ago

Watch his lecture series on YouTube. We you started programming, you had to adapt your brain to the way of thinking of computer programs. Think of this as an continuation of that evolution, were you acquire new methods of reasoning that can abstract many apparently different problems into the same concept.

xqb642• 8 days ago

Is it only applicable in e.g. Haskell, though, or is it language agnostic? Thanks for your answer.

Actegories

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