RSpec style guide VS milewski-ctfp-pdf

betterspecs.org is a good resource.

Both sites advocate for factories over fixtures (though there is a not clear consensus). With fixtures, test objects are all defined in fixture files with predefined data. Fixtures can be used across tests but modifying an existing fixture can break tests that depend on that fixture. As a codebase grows managing fixtures for all the various states of your object can be difficult. In comparison, factories let you build and configure new objects per test.

Better Specs (RSpec Guidelines with Ruby)

Category Theory for Programmers by Bartosz Milewski (https://github.com/hmemcpy/milewski-ctfp-pdf/releases)

Strangely similar name to the well-known 'Category Theory for Programmers'

https://github.com/hmemcpy/milewski-ctfp-pdf

There's this, but the programmer doesn't have to be working:

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

Milewski's "Category Theory for Programmers".

(3) category theory. I was never advised to read any, but found that bartosz's introduction really good. https://bartoszmilewski.com/2014/10/28/category-theory-for-programmers-the-preface/. Helps to rewire the brain.

It's also possible to model programming languages using category theory, but I know less about that. If you're interested in following this up, then Benjamin Pierce has what I'm told is a good introduction to category theory for computer scientists, and Bartosz Milweski has an online book (it might be available in hard copy as well, I'm not sure) called Category Theory for Programmers. I believe simple programming languages like the simply typed lambda calculus end up being modelled as Cartesian closed categories.