Talking Kotlin

Discussing Kotlin Coroutines with Marcin Moskała

October 23, 2025·2h 3m
Episode Description from the Publisher

Sebastian and Márton chat with Marcin Moskała about coroutines.Resources: Coroutines Mastery course Coroutines | Kotlin Documentation kotlinx.coroutines Taming Asynchronous Beasts | Marcin Moskała Coroutine Debugging in IntelliJ IDEA | Alexey Merkulov Lifecycles, Coroutines and Scopes | Alejandro Serrano Mena Collect Like a Pro | Manuel Vivo Untangling Coroutine Testing | Márton Braun JetBrains/lincheck – Concurrent testing framework #talking-kotlin on Kotlin SlackHosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Guest: Marcin Moskała – kt.academy Timeline:(0:00) Introduction(1:18) Branding discussion(3:23) Handling preconceptions(4:54) What are coroutines?(7:17) Lightweight threads?(11:07) Where coroutines live(13:27) Sequence Builder Example(17:37) The design of coroutines(20:52) What Makes Coroutines special vs other languages?(26:56) Coroutines vs Loom(34:55) Easy to start, hard to master(41:07) Common mistakes(49:33) Flows(58:52) Thinking about Flows(1:02:41) Derailing the conversation(1:03:55) Flows for single values(1:12:27) Structured concurrency(1:18:53) The 4 advantages(1:24:40) Seb tries web dev / The web is broken?!(1:31:15) collectAsStateWithLifecycle(1:32:00) Gardening break(1:36:23) Scopes and contexts(1:43:22) Testing coroutines(1:50:29) Lincheck(1:51:32) Turbine(1:55:05) Coroutines Mastery course(2:01:43) Wrap-up

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