Monads Made Semi-Understandable
summary
A concrete claim: monads are the pattern formed by two primitives, flatMap and apply (bind and return), plus the monad laws; Scala code shows how Option short‑circuits nested computations instead of null checks, how for‑comprehension is just sugar, and how map derives from flatMap+apply. Examples include Option, List, Try, IO and State, and the uploader cites using the scalac library to run law tests so an implemented monad can be validated rather than just asserted.
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chapters (24)
- 0:00Start
- 2:38The Global View
- 3:05Essence of FP
- 6:04"Functional Programming in Scala" (on monads)
- 6:36Why do we care? Intent of Monads
- 8:34Examples of Monads
- 9:36Option[A] What is the "Context" of Option?
- 10:22Handling potential null values
- 11:56Option monad to the rescue!
- 13:50flatMap and apply on Option
- 15:16Option flatMap and apply
- 22:48What happens if we have no Mission? None.
- 23:11Implementation of FlatMap again
- 23:47For Comprehension Sugar
- 25:03Generalizing flatMap
- 25:20Follow the Monad Laws
- 25:44Equality Laws
- 26:25Addition Laws
- 26:57Following the Laws
- 28:56Primitive Functions
- 29:38"map" in terms of monads
- 31:04Map can be "derived" from flatMap and apply
- 32:49Some Other Monads and Their Contexts
- 35:27Take Away
