The 4 Rules of Simple Design In Functional Programming
summary
Claims that the four rules of simple design — tests that pass, reveal intent, no duplication, minimal code — map directly to functional programming and to category-theory tools. Demonstrates a CSV birthday-greeting kata implemented in Kotlin using functors and monads to lift pure functions through IO, optional and error contexts, composing small functions into a single pipeline; tests become trivial, error-handling is encapsulated, and a 20-line brute solution collapses to a one-line composition that actually runs.
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chapters (5)
- 0:00Start
- 15:22Birthday Greetings Kata
- 17:52Categories Functional Design
- 19:26Define Arrows From the Outside
- 39:04A Category of all EndoFunctors
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