In the clean world of Kotlin coroutines, we can have many tasks running at different times, stacked up into surprisingly few threads. These coroutines often have to talk to one another, for example when an asynchronous task has finished and needs to report back, or an ongoing task needs to deliver results.
Kotlin has a number of different constructs to help us manage this communication. Suspend functions are helpful for waiting on asynchronous tasks, and flows are required if we’re expecting multiple results.

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This post provides recipes for understanding flows and asynchrony in Kotlin. It explains the use of suspend functions and flows for managing communication between coroutines. It also introduces hot and cold flows and demonstrates how to turn callbacks into suspend functions and flows.

Seven recipes to understand flows and asynchrony in Kotlin