Design patterns to category theory

https://blog.ploeh.dk/2017/10/04/from-design-patterns-to-category-theory/

This is the starting point of a series of articles written by Mark Seeman. On top of the sheer delight of finding that some people still care to write thorough and informative articles, the substance are of potentially great impact on how one design and implements software.

Sometimes open source implementation is what you need and look for under a time crunch. Sometimes an educating series like that helps you even more on the longer run.