Why Care About Functional Programming

on YouTube ↗46m

" summary

Claims that functional programming reduces what developers must keep in their heads, enforces referential transparency, and makes async, retries, timeouts and resource management declarative rather than imperative. Examples use Scala and Rust; concrete tools shown include the Z library (IO, flatMap, race, timeout, acquireRelease) and Tokio for Rust. A real bug example proves a test passes for months then fails because of hidden current-date side effects, and retry schedules are built and reused instead of handwritten loops.

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" chapters (16)

1. 0:00Introduction
2. 1:30Why FP matters today
3. 3:19Pure functions and power
4. 6:56Declarative vs imperative
5. 9:27Composing functions
6. 13:25Problem with imperative side effects
7. 15:56Referential transparency
8. 16:16Handling side effects functionally
9. 20:18Introducing IO monad
10. 23:48What is a monad
11. 26:59Common monads
12. 29:10Monads for async and errors
13. 35:16Category theory and FP
14. 36:41FP is not hard
15. 38:06Practical steps to adopt FP
16. 41:52Q&A

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