Summary

Conclusions

A coroutine separates a logical task from the thread that executes it. A structured scope defines the owner, cancellation defines the boundary of the work, and a dispatcher defines where it runs. Flow describes a sequence, and StateFlow the current state. Correctness starts with these contracts and only then moves on to choosing operators.

Self-check questions

1. Does suspend start a new thread?
2. Why can async { ... }.await() leave a program sequential?
3. When does coroutineScope complete?
4. Why is cancellation called cooperative?
5. Which errors does catch handle in a Flow?
6. Why is StateFlow unsuitable for a log of all transactions?