Functional programming in Kotlin: exploring Arrow

on YouTube ↗30m

" summary

Walks through concrete Arrow usage: error handling with Either.left / Either.right where left holds a sealed BadState (NotFound or CatchAll) and right holds values, shows Either.catch for exception wrapping, and replaces nested flatMap with a Either.eager and .bind monad comprehension to keep service code imperative. Demonstrates a pseudo Spring/Micronaut booking example where controller pattern matches to return 404 or 500. Shows optics with @optics-generated lenses to immutably update deep fields. Notes Arrow 1.0 ships last year and is production ready.

AI-written summary · about

" chapters (7)

1. 0:00Introduction
2. 3:20What is functional programming
3. 10:26Introducing Arrow library
4. 18:25Error handling with Either
5. 23:03Monad comprehensions in practice
6. 25:01Immutability and optics
7. 29:17Conclusion and Q&A

" related talks

• 47mFunctional programming in Kotlin: exploring ArrowTies van de Ven · Voxxed Days Luxembourg 2022
• 41mAn Arrow to the KotlinSaul Diaz Gonzalez · Mobilization 8
• 27mLeveraging the power of ArrowMonika Kumar Jethani · GDG DevFest Bangalore 2018
• 40mArchitecting Typed FP Applications & Libraries in Kotlin with ArrowRaúl Raja Martínez · Lambda World Seattle 2018
• 48mKotlin & Functional Programming: pick the best, skip the restUrs Peter · J-Fall 2023
• 34mFunctional Programming in Kotlin for AndroidDevsHari Vignesh Jayapalan · droidcon New York 2022
• 32mFrom Exception Hell to Typed Bliss: Real-World Error Handling with Kotlin and ArrowJordi Pradel · Lambda World 2025
• 51mFunctional fashion for Kotlin projectsAnton Arhipov · Jfokus 2023