Monads: Exploring Railway Oriented Programming in Ruby
summary
Live coding builds a small Ruby library that implements Railway Oriented Programming: an Outcome monad with Success/Failure types, bind and map for chaining single‑track functions, and an unwrap that raises once for controller error handling. Uses sbet for file typing, a pizza/lunch order example, and tests that end up all passing. Error types (invalid_param, forbidden) are added so failures carry standardized payloads. Code is on GitHub with branches main and use_outcome and the demo completes successfully.
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chapters (9)
- 0:00Railway Oriented Programming intro
- 1:45What is Railway Oriented Programming
- 9:10Monad for error handling
- 19:25Encapsulation and chaining with monads
- 23:25Refining error types
- 29:59Single-track functions
- 32:29Unwrapping outcomes
- 34:36Benefits of Railway Oriented Programming
- 36:44Q&A
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