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Mastering Kotlin Coroutines

A Function with a State and Resumed Value

Explore how Kotlin coroutines manage state within suspending functions by storing variables in continuations. Understand how functions resume with values or exceptions and how these outcomes are handled under the hood.

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A function with a state

If a function has some state (like local variables or parameters) that we need to restore after suspension, this state needs to be kept in the function’s continuation. Let’s consider the following function.

Kotlin 1.5
suspend fun myFunction() {
   println("Before")
   var counter = 0
   delay(1000) // suspending
   counter++
   println("Counter: $counter")
   println("After")
}

Here, counter is needed in two states (for a label equal to 0 and 1), so it ...