Whirlwind tour of the Scala Functional Programming ecosystem

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" summary

Builds a small but production-derived Twilio text service that receives HTTP requests, queries or inserts a phone number in a database, validates numbers, and sends SMS; uses Scalaz-style algebras, tests business logic by modeling external systems as a State "world" and asserting initial vs expected world, and chooses ZIO Task as the concrete F with doobie transact to run SQL and http4s + FS2 to expose a streaming server. Claims code mirrors iOFFICE production, composes effects, and runs when the stream is consumed.

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" chapters (21)

1. 0:00Introduction
2. 3:00referential transparency
3. 6:34side effects
4. 8:30in effect
5. 10:30Twilio
6. 11:50External services
7. 13:00Scala
8. 13:45Algebra
9. 16:20Business logic
10. 19:00Text message
11. 21:10State
12. 23:55Save
13. 27:00Scala Mach
14. 28:40Scala zio
15. 32:25Scala Twilio app
16. 39:05HTTP request
17. 40:10HTTP service
18. 41:35Stream
19. 42:10Error Handling
20. 44:05Wiring off the app
21. 48:10Using different effect types

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