Functional programming in Kotlin: exploring Arrow

on YouTube ↗47m

" summary

Arrow is shown solving real Kotlin problems: replace exceptions or nullable returns with Either with left error and right value to carry error context, use either.either.eager monad comprehension to write imperative-looking code that short‑circuits on errors, and compose @optics-generated lenses to update deep immutable data without manual copy chains. A pseudo Spring Boot booking demo compiles only when all error branches are handled. The arrow-analysis plugin turns runtime checks into compile-time errors but currently has Gradle, deserialization, and API limitations.

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" chapters (4)

1. 0:00Introduction and philosophy
2. 3:36Working with Either monads
3. 24:54Advanced Arrow features
4. 44:20Q&A and concluding remarks

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